Term
| How many apprentices can a license train in NJ? |
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Definition
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Term
Patients records should be kept for how long? |
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Definition
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Term
| How many credits must an Optician earn for continuing education to renew license? |
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Definition
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Term
| State permits a store to advertise with the "% percentage of sale off" under what condition? |
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Definition
| The original price of the items are also included in the advertisements. |
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Definition
The condition whereby one eye is pointed in a different direction than the other eye. Cross Eyed |
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Term
| Which chemical gives glass its photochromatic properties? |
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Definition
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Term
| A person wants an Occupational (double d's) bifocals made in polycarbonate, what is wrong with this request? |
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Definition
Occupational Bi-focals don't come in polycarbonate |
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Definition
| The breaking up of white light into its component colors, as by a prism. |
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Definition
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Definition
Dimness of vision resulting from non-use. Lazy Eye |
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Term
| How would you measure the pupillary distance of an inattentive child? |
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Definition
Canthus to Canthus Measure from outer canthus of one eye to inner canthus of other eye. |
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Term
| What is the minimum fitting height for progressive lenses? |
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Definition
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Term
| Iseikonic lenses are used to correct? |
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Definition
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Term
| Prism base out will convergence. |
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Definition
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Term
| A lens surface has two curves set at 90° to each other. What is this type of surface called? |
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Definition
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Term
| A lens clock which gives you a direct reading in diopters from the base on the index of? |
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Definition
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Term
| A minus lens moved away from the eye becomes effectively... |
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Definition
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Term
| An example of a monocentric bifocal is the? |
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Definition
| Executive or FT Thinline 35. |
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Term
| If you angle the adjustable pads arms down, what happens to the frame? |
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Definition
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Term
A patient with a P.D. of 70mm is fitted with a frame that has a 48 eye and 18 DBL. Each lens must be decentered? |
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Definition
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Term
| What is added to glass to achieve a photochromic lens? |
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Definition
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Term
A Patient with a P.D. of 59mm is fitted with a 46mm eye, 2DBL metal frames. Each lens must be decentered? |
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Definition
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Term
| A Shuron Pattern measures 41.5 mm long, the allowance that must be made for this pattern is? |
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Definition
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Term
| Three major factors that must be considered when beveling a lens? |
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Definition
- Size
- Thickness
- Quality of Bevel
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Term
| What is the visual ANGLE Resolution Power and size of the letter on the 20/20 line of the Snellen Chart? |
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Definition
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Term
| What metallic oxide is added to obtain flint glass? |
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Definition
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Term
| Myopia can be corrected with a? |
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Definition
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Term
| One optical tool which is not recommended for use on an Optyl frames is a? |
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Definition
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Term
| In lens design increasing the front curve without changing the effective power of the lens will magnification. |
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Definition
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Term
The principle function of a spectacle lens is to form an image at? |
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Definition
| The far point sphere of the eye |
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Term
The Silor New Super-no-line lens is a type multifocal. |
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Definition
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Term
It is possible for the optical center of a lens to be located in the front of the lens. True or False |
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Definition
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Term
| An optical medium that partially transmits incident light but does not permit observation of details is known as a body. |
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Definition
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Term
| Human eyes that are too short are said to be? |
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Definition
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Term
| Sixty degrees from its axis, a cylinder will show percent of its power. |
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Definition
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Term
| An ophthalmic crown glass lens transmits approximately percent of the light entering the lens. |
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Definition
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Term
Another term for Sagittal Value or "SAG" is? |
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Definition
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Term
| The breaking up of light into its component colors is known as? |
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Definition
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Term
To reduce the vertex distance of the right lens, angle the? |
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Definition
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Term
Binoculars are marked 7x35. What does "35" indicate? |
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Definition
| The diameter (size) of the objective lens. |
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Term
| During the manufactoring of glass, adding Ferrous oxide to the mix will result in what color? |
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Definition
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Term
What type of astigmatism does this prescription correct? RX: +2.00 -2.00 x 180 |
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Definition
| Simple Hyperopic Astigmatism |
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Term
| The name of the tilt that causes the bottom of the frame to protrude away from the cheek is called? |
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Definition
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Term
| A CR-39 lens is a poor absorber of light rays. |
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Definition
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Term
| The stronger the add power, above 2.50, the the segment inset. |
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Definition
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Term
| A minus lens acts as two prisms positioned? |
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Definition
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Term
A spherical lens improperly tilted before the eye will cause an? |
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Definition
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Term
| Vertex distance is measured from? |
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Definition
| Apex of Cornea to Back vertex of the lens. |
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Term
| For a child, the proper height for the bifocal is at the? |
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Definition
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Term
| What happens to the effective power of a plus lens as it is moved closer to the eye? |
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Definition
| It becomes weaker/ more minus |
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Term
| What is the index of refraction of polycarbonate? |
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Definition
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Term
| Can Silor UVS lens be tinted? |
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Definition
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Term
| Periscopic lenses have a base curve of ? |
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Definition
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Term
A negative toric lens will read only as a minus cylinder in a vertometer True or False |
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Definition
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Term
| If binoculars are marked 7x35, how much magnification will they produce? |
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Definition
7x (7times) 35 = Field of View |
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Term
| A periscopic convex lens has a base curve of ? |
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Definition
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Term
| The crystalline lens in the eye is? |
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Definition
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Term
| When a frame is given 8 degress of Pantoscopic Tilt the optical center shouls be located 4mm the center of the pupil. |
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Definition
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Term
| At 20ft. the letters on the Snellen 20/20 line subtend an angle of with the eye. |
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Definition
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Term
| To properly adjust the vertical angle of a nose pad you must view it from the? |
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Definition
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Term
| When two prisms are crossed, the resultant prism is always than either of the two. |
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Definition
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Term
| A radius of curvature increases, dioptric power will? |
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Definition
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Term
| Definite/Obvious turning of eyes from normal position resulting in binocular vision |
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Definition
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Term
| Name the two types of Aphakic Lenses |
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Definition
- Aspheric= emulates the shape of the eye: steeper curve in center, flatter towards the periphery
- Lenticular- high plus RX to minimize lens thickness. Carrier lens a bowl with RX
◊ Can be spherical or aspheric |
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Term
What is the distance from the front of the cornea to the ocular surface of the lens? |
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Definition
Vertex Distance Significant Chnage in +/- 7.00D RX's. |
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Term
What is Specific Gravity? |
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Definition
Weight in grams of 1 cubic cm of any given material ↑ Specific Gravity = ↑Weight |
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Term
| Prescribed for Specialized occupational or recreational needs |
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Definition
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Term
| What are Iseikonic Lenses? |
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Definition
| Spectacle lenses specially designed to manipulate image size when dissimilar sizes make it difficult or impossible for fusion to occur |
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Term
Rd Seg 22-28 mm diameter 2-3 mm of unusable area Considerable image jump in larger seg sizes Cosmetic appeal |
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Definition
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Term
The focal length of a lens may be altered by... |
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Definition
| Changing the curvature of one surface |
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Term
| Where is a base curve found? What determines steepness? |
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Definition
It is found on the sides of the lens with the bifocal More Plus lens = More Steepness More Minus Lens = More Flatteness |
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Term
Used for the correction of astigmatism Used by itself or combined with a sphere |
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Definition
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Term
| A lens location of zero deviation of the optical axis |
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Definition
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Term
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Definition
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Term
Used to determine lens power in the principal meridians |
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Definition
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Term
How do you find the total or absolute lens power at 180° or 90° when RX gives it at 45° or 135°? |
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Definition
Divide cylinder in half and add to sphere |
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Term
| How do you determine the lens power 90° away from the cylinder axis? |
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Definition
| Algebraically add sphere power to cylinder power |
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Term
| A small spring wire attached nasally to a frame to lift a drooping lid |
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Definition
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Term
Tendency for eye to turn from normal position resulting in binocular vision Used with a prefix to indicate the direction of deviation |
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Definition
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Term
| A refractive error in which the eyeball is too long in relation to focusing power, thus the point of focus for rays of light from distant objects falls in front of the retina. |
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Definition
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Term
| The refractive condition of the normal eye, when the crystalline lens is at rest, the image of distant objects is brought to a focus on the retina. |
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Definition
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Term
| A refractive error in which, because the eyeball is short in relation to the refractive power of the lens, the point of focus for rays of light from distant objects falls behind the retina; accomodating to increase refractive power of the lens is necessary for distance and near vision. |
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Definition
| Hyperopia/ Farsightedness |
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Term
| Combination of spheric lens with a cylinder |
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Definition
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Term
Horizontal Decentration required formula |
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Definition
Geometricl Center Distance minus PD divided by 2 |
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Term
| Index of Refraction of Aqueous Humor |
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Definition
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Term
Index of refraction of the crystalline lens |
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Definition
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Term
| Refractive power of the average cornea |
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Definition
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Term
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Definition
- Contains a filter polyvinyl alcohol "sanwiched" between glass or plastic lens material
- Reduces glare off reflected surfaces (water,snow,metal)
- Admits light vibrating only on vertical plane
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Term
| Index of Refraction Formula |
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Definition
◊Speed of Light in Air Speed of Light in material ◊ 186,000 |
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Term
| Minimum Blank Size Formula |
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Definition
(GCD - PD) + ED GCD = A+ DBL |
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Term
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Definition
| Silver Halide crystald in glass lens that respond to UV wave 300-400 nm "exposure memory" |
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Term
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Definition
1.523 index of refraction 2.55 specific gravity 59 V-value Less dispersion, impact resistant when chem/heat treated, scratch resistance-good |
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Term
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Definition
Standard Index of Refraction |
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Term
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Definition
A relative measure of the dispersion or color distortion of a lens Optical Center is non-existent as the eye turns behind a powered lens, prism is induced which causes distortion. |
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Term
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Definition
5/8" steel ball, weighing 56 oz dropped - 50" on horizontal surface of lens
- trough drop-ball tester tube
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Term
| Two Theories of Light Travel |
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Definition
- Wave Theory
- Corpuscular Theory (light as particle photons)
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Term
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Definition
Image "jumps" upward the moment the eye enters the segment The lower the power of the add and the farther the O.C. of the seg from the transition, the higher the "image jump". |
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Term
| When surface power increases, radius of curvature... |
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Definition
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Term
| A lens that has with motion is |
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Definition
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Term
| The angle of incidence is always greater than... |
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Definition
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Term
| A frame pupillary distance is equal to? |
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Definition
| The A measurement plus the DBL |
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Term
| The standard edger setting is? |
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Definition
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Term
| The comparision of the speed of light in air and the speed of light in a substance will determine? |
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Definition
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Term
| As radius of curvature decreases dioptric power will? |
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Definition
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Term
| A positive lens refracts parallel rays of light so that they.... |
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Definition
| Converge to a point behind the lens |
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Term
| The meridian with the most plus power has the... |
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Definition
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Term
| When parallel rays of light come to a point focus in fron tof the retina the eye is said to be.... |
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Definition
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Term
| A cylindrical lens will have? |
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Definition
A thinnest edge and a thickest edge |
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Term
| As diameter increases the SAG value will? |
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Definition
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Term
| As radius of curvature increases the SAG value will? |
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Definition
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Term
| Describe the four characteristics of a plus powered lens |
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Definition
- Has against motion
- Thicker in middle thinner at edges
- Converges rays of light
- Magnifies
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Term
| Describe four characteristics of a minus lens |
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Definition
- Has with motion
- Thicker at edges thinner at center
- Minifies
- Diverges rays of light
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Term
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Definition
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Term
Resultant Prism in Segment |
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Definition
| A point on a bifocal lens where the prism due to the distance RX is exactly offset by the prism due to the segment power. |
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Term
| Name the 4 methods for correcting vertical imbalance in bifocal lenses |
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Definition
- Slab-off (bicentric grinding)
- Compensated seg's
- Prism in seg's
- Dissimilar seg's
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Term
| To give lenses pantoscopic tilt you would... |
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Definition
Tilt the bottom of the frame toward the face |
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Term
| Name the four types of temples |
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Definition
- Skull
- Riding Bow
- Library
- Convertible
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Term
| The cornea absorbs ultraviolet light below? |
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Definition
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Term
| Our eyes are most sensitive to what color light? |
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Definition
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Term
| Normal transmission for sunglasses is generally between what percentages? |
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Definition
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Term
| When neutralizing an unknown pair of eyeglasses always neutralize the lens with? |
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Definition
| The most power in the 90th meridian |
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Term
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Definition
| How much light passes through the lens |
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Term
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Definition
| How much light does NOT pass through the lens |
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Term
| Protecting our eyes from ultraviolet light should be accomplished by blocking part of the spectrum up to what wavelength? |
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Definition
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Term
| What wavelength of ultraviolet light affects the crystalline lens? |
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Definition
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Term
| Which lens material offers the best U.V protection? |
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Definition
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Term
| What color distorts the visible spectrum the least? |
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Definition
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Term
| A plus lens moved away from eye effectively becomes |
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Definition
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Term
| A glass photochromatic lens is activated by what crystals found in the lens itself? |
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Definition
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Term
| Excessive pressure behind the right ear almost always causes pressure on which side of the wearers nose? |
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Definition
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Term
| To raise the right side of a frame you would... |
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Definition
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Term
| Which Segment type can afford to be set higher than normal? |
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Definition
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Term
| The most correct landmark for taking SEG heights for a bifocal is : |
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Definition
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Term
| The most correct landmark for taking SEG heights for a trifocal is: |
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Definition
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Term
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Definition
| A piece of wedge shaped material that will deviate a ray of light 1cm toward the base and displace an image towards the apex at a distance of 1M. |
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Term
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Definition
The breaking up of white light into its various spectral colors, as it passes through an optical medium |
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Term
| The optical axis of a lens should be aimed at the ? |
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Definition
| Center of rotation of the eye |
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Term
| The base curve of an aphakic lens should be taken with? |
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Definition
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Term
| Spheric (non-aspheric) aphakic lenses cause? |
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Definition
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Term
Most round lenticular lenses have a ? |
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Definition
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Term
To determine if a lens has an aspheric base curve you would use a ? |
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Definition
| SEG clock because the pins are closer |
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Term
Aphakic lenses should be fit? |
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Definition
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Term
| How much of a person's total amplitude of accomodation can a pair of eyes comfortably maintain over a sustained period of time? |
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Definition
| 40% to 60%: Nearest to 50% |
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Term
| What type of vision error does the Snellen chart often fail to detect? |
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Definition
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Term
| Reading inset on a progressive lens will always be : |
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Definition
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Term
| The minimum fitting height of a progressive lens is: |
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Definition
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Term
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Definition
| Near peripheral vision will decrease |
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Term
| The length of the corridor of a progressive lens can be: |
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Definition
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Term
| Name the 3 nosepad angles |
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Definition
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Term
| Name the 5 areas necessary to be checked for a good fitting procedure IN ORDER: |
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Definition
- Temple Spread
- Equal Vertex Distance
- Cosmetic Tilt
- Straightness
- Temple Curl
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Term
| Name the 5 variables for bifocal field size: |
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Definition
- Segment Size
- Vertex Distance
- Fixation Point
- Pupil Size
- Add Power
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Term
Most compound ophthalmic lenses have: |
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Definition
| Both spherical and cylindrical surfaces |
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Term
| The tendency of the eye to deviate from it's normal position is called: |
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Definition
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Term
| Designers of corrected curve lenses give much attention to? |
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Definition
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Term
| A +3.00D lens has the following pismatic effect 8mm below the optical center: |
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Definition
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Term
| A characteristic which most single vision "plastic" lenses have in common is: |
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Definition
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Term
| Corrected curve lenses have : |
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Definition
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