Term
| when you incease the index of a lens do you change the speed of light traveling through the lens medium |
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Definition
| yes the speed of light will decrease |
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Term
| what part of the retain is concerned with visual acuity and color perception |
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Definition
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Term
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Definition
| normal eye (eye with no reft error )light focus on the retain |
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Term
| directing the visual axis of the eyes to near point is |
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Definition
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Term
| it is not recommended to heat treat lenses stronger than |
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Definition
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Term
| it would be necessary to ? the lens to mount it in a nylon suspension type frame |
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Definition
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Term
| warpage may be removed from a plastic lens by placing the frame and the lens in a |
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Definition
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Term
| the RX of patient is OU -9.25 -0.75X180 what are the recommended precautions to take in prder ti insure proper fitting |
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Definition
| monoculat PD and OCHT measurements |
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Term
| which of the following is not a cause of one lens being higher than the other |
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Definition
a bent earpiece
a bend in the temple shaft
a skewed bridge
one ear higher than the other
ALL OF THEM ARE POSSIBLE CAUSE |
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Term
| if the wearer complains of the bifocal line being some what in his way when driving the problem may be alleviated by decreasing the distance between pads |
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Definition
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Term
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Definition
| a triangle representing the main supporting point for a pair of glasses |
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Term
| if the eyelashes rub the lenses the fitter should |
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Definition
| increase the vertex distance |
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Term
| if the wearer complains that the glasses feel snug but still slip down the nose one likely cause is that |
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Definition
| pressure is being applied by the temple shafts anterior to the ear |
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Term
| when viewing the wearer from the front it is discovered that the frame sits too far to the left (wearer's right )on the wearer's face .this could be cause by ? |
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Definition
both pads shifted to wearer's left or
the wearer's nose being crooked |
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Term
| if both nose pads press the nose or indent too much what is probably not a possible cause |
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Definition
| temple spread is not even |
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Term
| to eliminate a gap between the lens and a metal eyewire ,the best alternative is to |
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Definition
| place a strip of lens liner at the point exactly opposite the gap |
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Term
| which factor is nonessential in dispensing the progressive add lens |
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Definition
a good pantoscopic angel
short vertex distance
large b dimension
good monocular lens centration
ALL OF THE ABOVE ARE ESSENTIAL |
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Term
| what is the geometrical center distance of frame marked A 50/DBL 17 |
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Definition
add the a with the dbl 50+17=69
that is the geometrical center distance |
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Term
| the larger the frame difference ? the lens shape |
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Definition
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Term
| if a frame dimensions are A 50 and the ED 55 with frame difference of 8 ,what is the B |
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Definition
take the A 50 mearsurement - 8 the difference and the is the B
ANSRW IS 42 |
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Term
| a frame is marked 52/18 the lens shape is round ,what is the effective diameter of the lens ? |
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Definition
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Term
| which error is of no consequence in verifying correctness of frame and lenses |
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Definition
air space between lens and frame
chips in the lens edge between bevel and lens surface
distortion (unevenness)in lens edge between bevel lens surface
ALL OF THE ABOVE ARE OF CONSEQUENCE |
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Term
| when the wearer's PD is less than the frame FD |
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Definition
| positive face form is required |
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Term
| the new bifocal wearer must |
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Definition
| drop the eye to read a book |
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Term
| when the frame front is tested for four point touch but only touches in the two temporal eyesores the frame |
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Definition
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Term
| which of following errors will not be detected by a four point touch test |
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Definition
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Term
| it is unnecessary to use heat in adjusting a zly frame when |
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Definition
| changing the pantoscopic angel |
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Term
| if the pad arms bent up and the pads re-aligned this adjustment will |
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Definition
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Term
| what is the final step in fiiting a frame to a patient |
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Definition
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Term
| if the frame is crooked with the right side higher then the left which is not a possible cause |
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Definition
| the pantoscopic tilt of the right side needs to be increased |
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Term
| the main for the use of lenticular lenses for high powers would be |
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Definition
| they are lighter in weight |
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Term
| a patient come back to the optician complaining of pain behind the ears possible causes are |
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Definition
temple tension too great
uneven pressure
temple end pieces angled in too much
ALL OF TH E ABOVE |
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Term
| what type of frame may be heated until it bends under its own weight |
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Definition
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Term
| the step fro finishing a lens (in correct are ) |
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Definition
| calculation spotting centeration blocking edging |
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Term
| why is it necessary to take the B measurement |
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Definition
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Term
| for every 2 degrees of pantoscopic tilt the optical center should be |
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Definition
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Term
| usual reading level is considered to be ? below |
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Definition
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Term
| a bifocal wearer having difficulty accommodating could most ofter be helped by adding ? to his prescription |
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Definition
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Term
| which of the following is essential to place a prescription |
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Definition
lens prescription
frame name size and color
customers fitting dimensions
ALL OF THE ABOVE |
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Term
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Definition
| makes people feel like they are walking downhill |
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Term
| which statement is correct |
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Definition
| polycarbonate lenses block UV radiation |
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Term
| a number 3 tint is absords |
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Definition
| 80%of the light entering the lens |
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Term
|
Definition
increase transmission
reduce reflection
increase vision |
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Term
| a patient complains that his old glasses have better visual acuity than the new glasses (same RX)what should an optician do ? |
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Definition
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Term
| a patient complains of too much pantoscopic tilt .what should the optician do |
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Definition
| angel the temples upward from the endpieces |
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Term
| a patient with a perscription should wear a small frame to minimize |
|
Definition
decentration
thinkeness
weight
ALL OF THE ABOVE |
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Term
| what shape frame should be worn by high minus power |
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Definition
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Term
| active people should wear what type of temple |
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Definition
| comfort cable or riding bow |
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Term
| people that have glasses on and off should wear ? types temples |
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Definition
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Term
| within the first few minutes of contact with a new patients |
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Definition
| generate in the patient confidence in your ability |
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Term
| what can you expect medicare to cover |
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Definition
| corrective lenses following cataract surgery |
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Term
|
Definition
1m
and 1m is
100cm
1000mm
40in |
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Term
| prism tolerance in the vertical meridian is |
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Definition
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|
Term
| as a general rule patient tolerance for prism imbalance in horizontal meridian is |
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Definition
|
|
Term
| the cylinder axis tolerance for a 0.25D cylinder is |
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Definition
|
|
Term
| the cylinder axis tolerance for a 0.75D cylinder is |
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Definition
|
|
Term
| the cylinder axis tolerance for a 1.00D cylinder |
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Definition
|
|
Term
| the cylinder axis tolerance for a 2.00D cylinder is |
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Definition
|
|
Term
| the tolerance for lens thickness when specified for special prescription purposes is |
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Definition
|
|
Term
| the segment location tolerance in vertical (segment height )meridian in a mounted |
|
Definition
| pairs should match within 1.0mm of specification |
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Term
| lens calipers are used to measure lenses for |
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Definition
|
|
Term
| the prism measurement indicator found in a lensometer is called |
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Definition
|
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Term
| the instrument that can help you determine a heat temperd glasslens or stress in the lens is |
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Definition
|
|
Term
| line axis pliers are used fro purpose of |
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Definition
| strightening lens axis in zyl frames |
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Term
| glass lenses for stander use must with stand |
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Definition
| 5/8inc steel ball dropped from a height of 50inc |
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Term
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Definition
zylonite/zyl orignally the most used material for plastic frames
cellulose propionte can be made thinner and lighter then zly
nylon lightweight hypollergenic and relatively unbreakable (good for sport wear gl)
rubber sometimes used for sport eyewear and sungl
carbon fiber adding carbon power gives plastic frame the streng5h of mental frame while keeping them lightwight
polyamide/copolymideblend of nylon that features durability reduced weight and flexbility considered hypo allergenic (never place in salt pan ,shinkage occurs when heated,dont clean with isoproply alcohol or products containing alcohol)
opty opty is considered thermoelastic has memory
kevlar also used for bullet prof vests and sports equlpments because of high tensile strength
polycarbonate reduced weight and fixibity hold translucent color well highly scr resistast
cellulose nitrate the first plastic uses it is flammable and unstable it is no longer used |
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Term
|
Definition
zylonite /zyl orginally the most used material for plastic frame
cellulose propionate can be made thinner and lighter then zly
nylon lightweight hypoallergenic and relatively unbreakable (especially effective for sports and safety frame )
robber sometime used sports eye wear and sunglasses
carbon fiber adding carbon power gives plastic frame the straight of mental frame while keeping them light wight
polyamide/copolyamide blend of nylon that features durabilty reduced weight .flexibility considered hypo-allergenic ,never place poly amide frame in salt pans shrinkage occurs when heated ,don't clean with isopropy alcohol or products containing alcohol
opty opty is considered thermoplastic has memory
kevlar also used for bullet proof vest and sports equlpment because high tensite strength
ploycarbonte reduced weight and flexibility holds translucent color well and highly scratch resistant
cellulose nitrate the first plastic used it is flammable and unstable (no longer used )
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