Ophthalmic Optics Final Questions With Complete Solutions
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Course
OCPP
Institution
OCPP
Ophthalmic Optics Final Questions With
Complete Solutions
What is a prism diopter? 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 re...
Ophthalmic Optics Final Questions With
Complete Solutions
What is a prism diopter? 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 c) prism reference point (PRP/MRP)
What is prentice's rule? 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 c) both
, Ophthalmic Optics Final Questions With
Complete Solutions
When does unwanted prism occur? 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 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? frame PD= (A+DBL)/2
What happens if both eyes are not pointed at the same target at the same time? 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 d) because BU should be used to correct hypo
, Ophthalmic Optics Final Questions With
Complete Solutions
How do you line up the PRP with PD? 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 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 c) cancel; add
, Ophthalmic Optics Final Questions With
Complete Solutions
When combining prism across the same eye: opposing directions will ______ and same direction
will______ cancel; add
What can we do to improve lens appearance for high amounts of prism? split the prism
between both eyes
Which prism corrects temporary conditions and allows for correction in plano power?
a) Fresnel
b) Resultant
c) Grinding
d) Clip on d) clip on
Which prism grinds the difference between edge thickness along the base-apex line at the
meridian of prismatic effect?
a) Fresnel
b) Resultant
c) Grinding
d) Clip on c) grinding
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