Term
| The corneal consists of 5 layers which in order from anterior to posterior are |
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Definition
- Epithelium, Bowmans membrane, Stroma, Descemets membrane, Endothelium
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Term
The amount of light entering the eye is controlled by the: |
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Definition
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Term
| There are approximately ____ million rods located mainly in the periphery of the retina and ____ million cones located centrally in retina |
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Definition
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Term
The term for the refractive condition where light comes to a focus directly on the retina: |
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Definition
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Term
| The term for the refractive condition where light comes to a focus behind the retina |
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Definition
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Term
The term for the refractive condition where light comes to a focus in front of the retina: |
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Definition
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Term
The term for the refractive condition where light comes to a focus on 2 different points: |
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Definition
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Term
| The onset of presbyopia generally begins at age |
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Definition
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Term
The 6 extraocular muscles responsible for stabilization of the eye are: |
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Definition
- Lateral rectus, Medial rectus, Superior rectus, Inferior rectus, Superior oblique, Inferior oblique
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Term
When the eye has a definite or obvious turning from its normal position it is called: |
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Definition
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Term
| Phorias and tropias are further defined by their direction of movment: ____ as meaning outward (temporally), ____ as meaning inward (nasaly), ____ as meaning downward, and ____ as meaning upward. (place them in the correct order |
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Definition
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Term
| We really see with our _______ |
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Definition
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Term
A perfect human eye is said to be ____________. |
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Definition
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Term
| Everyone will suffer from __________ if they live long enough |
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Definition
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Term
Astigmatism means that the patient's cornea is _____. |
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Definition
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Term
The fibrous tunic consists of the |
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Definition
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Term
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Definition
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Term
Aqueous humor is produced by the |
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Definition
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Term
The index of refraction of the cornea is |
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Definition
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Term
| When light entering the eye, without corrective lenses, comes to a focus partially in front of the retina and partially in back of the retina, the patient's refractive error is |
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Definition
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Term
When light entering the eye, without corrective lenses, comes to a focus in front of the retina, the patient's refractive error is ________. |
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Definition
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Term
The patient normally has no need for any visual correction for distance, but does require prescription lenses to see well at near. This patient's refractive error is known as |
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Definition
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Term
An Rx with the O.D. minus and the O.S. plus is an obvious case of _______. |
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Definition
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Term
Accommodation is defined as _____________. |
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Definition
- the act of the crystalline lens changing its shape to focus for objects at varying distances
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Term
Transpose the following prescription: +2.25 +1.75 X 085 |
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Definition
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Term
Equiconcave, flat concave, and meniscus are ALL types of |
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Definition
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Term
Equiconvex, flat convex, and meniscus are ALL types of: |
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Definition
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Term
| What is the best base curve for a -3.75D lens |
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Definition
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Term
How much cylinder power is in effect at the specified axis? |
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Definition
- 0% none cause it a sph lens
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Term
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Definition
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Term
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Definition
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Term
Transpose the following prescription: -0.75 +3.00 X 180 |
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Definition
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Term
What is the best base curve for a +2.50D lens? |
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Definition
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Term
| Eyeglass prescription powers are written in |
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Definition
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Term
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Definition
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Term
| To switch between minus and plus cylinder forms we use |
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Definition
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Term
Plus lenses ________ and minus lenses ________. |
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Definition
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Term
Given an Rx with all specifications equal but ground in material of different indices, which set of lenses will be the thinnest? |
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Definition
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Term
| A lens having one concave and one convex surface is called a __________ lens |
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Definition
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Term
The dioptric difference between the lenses for the prescription of O.D. +2.00 sph, O.S. +0.50 sph would be: |
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Definition
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Term
| Astigmatism is corrected by a lens having |
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Definition
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Term
Given the prescription +1.00 +1.00 axis 90, how much of the +1.00 cylinder is in effect at axis 90 (the vertical meridian of the lens)? |
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Definition
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Term
A myope always has in his or her prescription the following kind of power: |
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Definition
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Term
The relationship of front and back curvatures on a spectacle lens will determine: |
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Definition
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Term
How much cylinder power is in effect 90 degrees away from the specified axis? |
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Definition
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Term
| All the questions in the quiz along with their answers are shown below. Your answers are bolded. The correct answers have a green background while the incorrect ones have a red background |
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Definition
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Term
| Which material is known for its superior impact resistance |
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Definition
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Term
AR coatings cause light incident upon the lens to be |
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Definition
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Term
| What lens treatment best reduces glare from water and road surfaces |
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Definition
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Term
Which of the following lens materials requires a UV coating to protect from ultraviolet radiation? |
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Definition
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Term
| Multifocal lenses are generally used to correct for |
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Definition
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Term
| Multifocal lenses are generally used to correct for |
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Definition
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Term
The process used to reduce the bottom thickness of a progressive lens is called |
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Definition
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Term
A slab off is used to compensate for differences in induced prism between the eyes caused by |
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Definition
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Term
Cataract surgery removes the crystalline lens of the eye causing the patient to lose the ability to focus. This condition is known as |
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Definition
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Term
| The refractive index of CR-39 is |
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Definition
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Term
| Plastic lenses are made of a hard resin material known as |
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Definition
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Term
It is generally accepted procedure to fit the top of the trifocal segment to the: |
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Definition
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Term
Multifocal height is usually determined by measuring from the: |
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Definition
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Term
Trifocals are most generally prescribed when the patient is: |
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Definition
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Term
| Bifocals are used to correct for a condition called |
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Definition
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Term
Which one of the following lens materials is generally thought to provide the best impact resistance for children's eyewear? |
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Definition
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Term
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Definition
- the absence of the crystalline lens
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Term
| All the questions in the quiz along with their answers are shown below. Your answers are bolded. The correct answers have a green background while the incorrect ones have a red background |
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Definition
- monocularly and binocularly
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Term
A _________ PD is given as one number. |
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Definition
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Term
What does the OC in OC height stand for? |
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Definition
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Term
In what year did the Optical Manufacturers Association adopt the Boxing System to provide a standard for frame and lens measurements? |
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Definition
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Term
Which of the following is not an attribute of Monel? |
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Definition
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Term
| The A measurement of a lens is |
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Definition
- The horizontal distance between the vertical sides of the box
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Term
Which is an advantage of a Titanium frame? |
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Definition
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Term
| For cosmetic reasons, it is best to pick a frame that |
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Definition
| Has a frame PD that matches the patients |
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Term
There are two kinds of frame materials ___ and ____. |
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Definition
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Term
| There are three common types of lens mountings |
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Definition
- Bevel-Bezel, Semi-Rimless, Three-Piece
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Term
Frames are measured using the following Boxing System points: |
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Definition
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Term
Outward inclination of the bottom of the framed lenses is called _______ tilt. |
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Definition
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Term
| The type of bridge on a plastic frame designed to rest entirely on nose pads is the |
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Definition
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Term
If the eyewires touch the cheeks, the adjustment to take care of this condition would be: |
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Definition
- Decrease pantoscopic tilt
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Term
| If the top of the front is pressing against the brow, the adjustment to correct the condition would be |
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Definition
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Term
When adjusting the frame, the front can be lowered by using the following adjustment: |
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Definition
- By spreading the pads further apart
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Term
To relieve excessive pressure causing soreness at the back edge of the nose pads, a good adjustment would be: |
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Definition
| Flare pads out more (spread back edge apart more |
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Term
If the pad arms are bent up and the pads realigned, this adjustment will: |
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Definition
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Term
| If the right temple is angled down, this adjustment will |
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Definition
- Raise the right side of the front
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Term
| If the pad arms are lengthened, this adjustment will |
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Definition
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Term
If the pads are brought closer together, this adjustment will. |
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Definition
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Term
If the right temple is angled out, this adjustment will: |
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Definition
- Bring the right side of the front toward the right eye
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Term
| To relieve tension on both ears, a good adjustment would be to |
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Definition
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Term
When a frame is said to have pantoscopic tilt, the following condition is meant: |
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Definition
- The bottoms of the eyewires are in closer than the top
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Term
| When a frame is said to have retroscopic tilt, the following condition is meant |
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Definition
- The bottoms of the eyewires are out further than the top
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Term
Bowing temples is an expression referring to: |
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Definition
- Curving temples around the head
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Term
To adjust the frame so it sits lower on the face, bend the pad arms _________ . |
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Definition
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Term
Internal lens stress can be detected using a |
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Definition
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Term
A lensometer is used for measuring |
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Definition
- Sphere Power
- Cylinder Power
- Prism
- All of the above
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Term
Prism is read in lensometer using the |
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Definition
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Term
Vertex distance is measured using a |
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Definition
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Term
A lensomter reticle is divided in quadrants to measure the |
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Definition
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Term
| Lens calipers are commonly used to measure |
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Definition
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Term
| A pupillometer is used to measure the |
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Definition
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Term
The private agency whose function is to set commercial and industry standards is |
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Definition
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Term
The ANSI document covering ophthalmic standards |
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Definition
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Term
Which of the following categories of lenses are not exempt from drop ball testing? |
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Definition
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Term
According to ANSI standards, a lens with 0.50 D of cylinder must have an axis within |
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Definition
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Term
The governmental agency established for the purpose of reducing deaths, injury, and illness in the workplace is |
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Definition
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Term
The ASTM institute sets standards for which of the following ophthalmic products: |
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Definition
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Term
| In drop ball testing a ____ ball is dropped from ____ on to the front surface of a lens |
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Definition
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Term
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Definition
| Requires opticians to warn patients of significant risks in certain aspects of lenses and frames |
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