Ophthalmic Optics Final Exam Questions and Answers 100% Accurate
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Course
Ophthalmic Optics
Institution
Ophthalmic Optics
Ophthalmic Optics Final Exam Questions and Answers 100% AccurateOphthalmic Optics Final Exam Questions and Answers 100% AccurateOphthalmic Optics Final Exam Questions and Answers 100% AccurateWhere is the best vision in the progressive lens? - ANSWER-corridor (even though there's some distortion in...
Ophthalmic Optics Final Exam
Questions and Answers 100% Accurate
Where is the best vision in the progressive lens? - ANSWER-corridor (even though
there's some distortion in periphery)
Which of the following is NOT true:
a) prism bends light
b) prism changes the vergence
c) prism doesn't change the clarity of the image
d) prism has prismatic power - ANSWER-b) because prism does NOT change the
vergence
light moves towards the _______ and image moves towards the __________
a) base; apex
b) base; base
c) apex; base - ANSWER-a) base; apex
do we prescribe prism relative to the base or the apex? - ANSWER-base (base in or
base out etc)
What is a prism diopter? - ANSWER-The amount of prism needed to divert a ray of light
1 cm from its original path measured 1 m distance
What is the location that the prism is prescribed in single vision lenses?
a) fitting cross
b) distance reference point
c) prism reference point - ANSWER-c) prism reference point (PRP/MRP)
What is prentice's rule? - ANSWER-prism diopters= decentration (cm)* lens power
(the power used in this equation is the power in the meridian that the patient is looking
in)
Reasons to prescribe prism
a)strabismus
b) phoria/tropia
c) both a and b - ANSWER-c) both
When does unwanted prism occur? - ANSWER-when the lab de-centers incorrectly and
the patient is no longer looking through the OC
Decentering the lens occurs when moving the ______ to where the _____ is
a) frame to where the eye is
, b) eye to where the frame is - ANSWER-a) you have to move the frame you can't move
the eye (move frame to align OC with PD)
What is the equation for PD? - ANSWER-frame PD= (A+DBL)/2
What happens if both eyes are not pointed at the same target at the same time? -
ANSWER-diplopia (prism can correct double vision)
Which of these prism prescriptions is not paired correctly with the tropia it corrects:
a)BI-exo
b)BO-eso
c)BD-hyper
d)BU-hyper - ANSWER-d) because BU should be used to correct hypo
How do you determine the prescription for NVO glasses? - ANSWER-same as what
would be in the bifocal- distance + add
Which is not a major disadvantage with traditional bifocals?
a) fixed working distance
b)blurry at distance
c) image jump from the add - ANSWER-b) blurry at distance- it shouldn't be if they are
looking through carrier
Why are progressives better than bifocals? - ANSWER-- seamless increase in add
power
-accounts for all working distances
-vertical eye movement without having to change head position due to image jump
How do you line up the PRP with PD? - ANSWER-first decenter the lens so that the OC
is aligned with PD, then after finding the prism reference point with prentice's rule,
decenter the frames again so that PRP is lined up with PD
Horizontal prism in the same direction ______ and different direction______ when
combining prism across both eyes
a) add; add
b) add; cancel
c)cancel; add - ANSWER-b) add; cancel
Vertical prism in the same direction ______ and different direction______ when
combing prism across both eyes
a) add; add
b) add; cancel
c)cancel; add - ANSWER-c) cancel; add
When combining prism across the same eye: opposing directions will ______ and same
direction will______ - ANSWER-cancel; add
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