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abo optical
optical review seminar part 3
82
Other
Not Applicable
11/01/2012

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Cards

Term

the power drum of a lensometer reads +2.25 for the sphere and -1.00 for the cylinder and the axis is 45

what is the cylinder of this lens

Definition
-3.25X45
Term
the instrument to check the vertex distance is a
Definition
distometer
Term
a presbyopic golfer wants glasses only for golf ,what would you recommed
Definition
round 22 decentered low
Term
for a high minus RX which of the following will improve the appearance
Definition

high index plastic

a frame with a small ED

less decentration

Term

RX is   OD -4.50 4BD

          OS -5.00 2BO

which of the following is a usual way of ordering the lenses

Definition

OD -4.50 2BD 1BO

OS -5.00 2BU 1BO

Term
which of the following is recommended for children's bridge
Definition
saddle
Term
a frame fits perfectly on your patient .the temple bridge and pads are fine but the frame sits high ,you should select a frame with a bridge that is
Definition
lower
Term
which lens design would you recommend for high a plus RX
Definition
aspheric
Term

RX OD +10.00 -1.00 X180

OS  BALANCE         

what is the best lens for the left lenes if its a bal lens

Definition

OS +9.50

RX will be

OD +10.00 -1.00 X180

OS +9.50 SPH           

 

 

 

Term

RX OU +11.00 -1.00 X90

add 3.00 this is an aphakic patient ,he wants separate sunglasses just for golf .what would you recommend

Definition
just a SV lens and tell him to slide the glasses down the nose to see near
Term
standard trifocals have an intermediate the is
Definition
50% of the near add
Term

if the RX is ordered as +3.50 -1.00X90 and received

+3.00-1.00X90 what would the optician do

Definition
send it back to the lab (the power is off to much it not even with in tolerance
Term

RX OU -0.75 +1.00X180 ADD2.00

PPD 64/60 patient needs SV near glasses

what would you order

Definition
OU +1.25 +1.00X180 PPD 60
Term
how long should a prescription of a patient be kept
Definition
3 years
Term
the pantoscopic tilt can be increased up to
Definition
8 to 10 degrees
Term
the foucal length of a 2.00D lens in 20" what happens to the focal length if the power doubles
Definition
halves
Term
which of the following frame design would you recommend to a patient with a flat and low bridge
Definition
adjustable pads
Term
magnesium fluoride is a chemical used for
Definition
reducing the reflection
Term

a patient with an RX of +10.00 RVD OF 16MM chooses a frame with FVD of 11MM

what would the rx be

Definition

+10.50

 

Term

in what meridian this the minimum power 

plano -3.00X45

 

Definition

45

 

Term
limbus is surrounded by
Definition
cornea
Term
a meniscus lens is a
Definition
concave convex lens
Term
what part of the eye is responsible eye is responsible for 80% of the light refraction
Definition
cornea/iris
Term
the power of a bifocal add is the difference between
Definition
the front vertex measurement of distance and near
Term
in the system of lens measurement the B represents
Definition
lens depth
Term
a plus lens moved downward from the primary position results
Definition
BD prism effect
Term
tempering a lens by heat results in a lens being
Definition
more resistance to impact
Term
a polariscope is used to check inserted lenses for
Definition
strain /stress
Term

an uncoated glass lens tinted grey #3 with a RX of     

-5.00D will be

Definition
darkest around the edges
Term
a scotoma is
Definition
an area of retinal vision loss
Term
in normal binocular vision accommodation is always asasociated with
Definition
convergence
Term
besides accommodation the crystalline lens
Definition
filters ultraviolet radiation
Term
images formed on the retina are transmitted to the brain by the
Definition
optic nerve
Term
an average human eye is ? long
Definition
1 and 1/8 inches
Term
the ability to maintain single binocular vision with both eyes is called
Definition
fusion
Term
when aphakic lenses are tiltesd too much pantoscopically .what can be expected
Definition
an error of refactive power is induced
Term
to widen the distance between the pads of a frame or mounting bend the pad arms
Definition
outward
Term
a person wearing bifocal lenses having difficulty accommodating could most often helping by adding --- to the RX
Definition
plus power
Term
when the right temple is angled down ,this adjustment will
Definition
raise the right side of the front
Term
if the right temple is angled out this adjustment will
Definition
bring the right side of the front  toward right eye
Term
what is optical center
Definition
the point of no refraction on a lens
Term
what is the geometrical center
Definition
the point where A and B intersect
Term
the A measurement of a frame is
Definition
the lonest horizontal measurement
Term
the definition of DBL is
Definition
the least distance between lenses
Term
a prism deviate the light toward its
Definition
deviate the light toward its base
Term
the ----- of a frame is twice the longest radius of that frame
Definition
ED
Term

prisms are used to correct strabismus.strabismus.menas 

muscle imblance , there are 2 types of strabismus :PHORIA &TROPIA

 PHORIA: means tendency of the eyes to deviate

TROPIA:means obvious deviation of the eye  

 

Definition

eye turns out is called EXOPHRIA/TROPIA

need (base in)

eye turns in is called  ESOPHORIA/TROPIA

need (base out)

eye turns up is called HYPERPHORIA/TROPIA

need (base down )

eye turns down is called HYPOPHORIA /TROPIA

need (base up)

Term
prism that ADD and prism that CANCEL
Definition

base up and base down ADD

base up and base up CANCEL

base down and base down CANCEL

 

 

base in and base out CANCEL

base in and base in ADD

base out and base out ADD

Term
to induce prism in a minus lens move the lens to opposite direction
Definition

to induce base in /move out

to induce base out / move in

to induce base up /move down

to induce base down /move up

 

 

Term
to induce prism in a plus lens move the lens to the same direction
Definition

to induce base in /move in

to induce base out /move out

to induce base up /move up

to induce base down /down  

Term
which of the following combination of prisms are not a canceling situation
Definition
base in base in
Term
where will the image appear too be in a prism
Definition
at the optical center
Term
the diopter power of a lens is related to
Definition

the radius of each surface

the optical material

the thickness of the lens

ALL OF THE ABOVE

Term
as the focal length of a lens increases the diopter power
Definition
decreases
Term
the smaller the radius the
Definition
shorter the focal length
Term
as refractive index increases the thickness of the lens
Definition
decreases
Term

which of the following statement regarding CR-39 lenses

is not correct

Definition
they are thinner than glass lenses
Term
which of the following statement regarding polycarbonate lenses is not correct
Definition
they break easily
Term
higher the specific gravity of material
Definition
heavier the lens
Term
lower the abbe number of a material
Definition
greater the chromatic aberration or dispersion
Term
which of the following lens material has the highest abbe number
Definition
CR-39
Term
three identically shaped meniscus plus lenses are made from three different materials  .which lens will have the most power
Definition
the polycarbonate
Term
higher the refractive index
Definition
the better the absorption of UV radiation
Term
the height from which the steel ball used for drop ball test is dropped is
Definition
50 inches
Term
magnification and minification of a lens can be altered by which of the following
Definition
base curve,vertex distance,lens thickness,power and index
Term
round segment should be ordered --- then ft seg
Definition
higher
Term
if a person keeps his head back ,his bifocal should be set slightly --- than normal
Definition
lower
Term
a piano player asks his optician for a pair of glasses to see the notes that are an arm length away .what should the optician recommend
Definition
sv intermediate lenses
Term
above musician wants another pair for when he plays in an orchestra what you recommend
Definition
bifocal with intermediate rx in the seg
Term
what trifocals is for a computer programmer
Definition
crt trifocals
Term
which of the following multifocal lens styles is not an occupational lens
Definition
ED8X25
Term
the measurement need to calculate segment drop is
Definition
the B measurement
Term
which PD do we use to calculate horizontal decentration for bifocal
Definition
near PD
Term
the lens clock may also be used to check
Definition
slab off
Term
the best was to heat nylon frames is by useing
Definition
hot water
Term
what is physiological blind spot
Definition
it is when image is formed on the optic disc
Term
how much is average convergence for eyes for reading
Definition
4mm
Term
image is formed on the
Definition
retina  but we really see with are brain
Term
how the CR-39 lenses should be cleaned
Definition
wash them with soap and water and wipe them with clean cloths
Term
the type of patient often bothered by specular images is
Definition
the myopic patient
Term
after the patient has placed the order the optician must
Definition
coordinate all elements of the order
Term
within th efirst few minutes of contact with new patient you must
Definition
generate a feeling of confidence in the patient
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