COT Exam UPDATED Actual Exam Questions and CORRECT Answers
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Course
COT
Institution
COT
COT Exam UPDATED Actual Exam
Questions and CORRECT Answers
Due to refraction a prism bends light rays toward the ___________of the prism? - CORRECT
ANSWER- Base
What is P=C/D ? - CORRECT ANSWER- P = Prism
C = the displacement of the object in cm
D = the distance between the prism and the v...
COT Exam UPDATED Actual Exam
Questions and CORRECT Answers
Due to refraction a prism bends light rays toward the ___________of the prism? - CORRECT
ANSWER✔✔- Base
What is P=C/D ? - CORRECT ANSWER✔✔- P = Prism
C = the displacement of the object in cm
D = the distance between the prism and the virtual
image in meters
This formula explains the relationship between the power of prism and the ability to bend
light.
Two Prisims base-to-base form what type of lens? - CORRECT ANSWER✔✔- Plus
or
Convex
Convex lenses do what to light rays? - CORRECT ANSWER✔✔- Converge them
Two prisms placed apex-to-apex for what kind of lens? - CORRECT ANSWER✔✔- Minus
or
Concave
What is Prentice's Rule? - CORRECT ANSWER✔✔- A rule to calculate induced prism in
glasses whose optical centers have been decentered.
Induced prism=lens power (in D) X Optical center displacment (in cm)
Cinically, Infinity is determined to be at what distance? - CORRECT ANSWER✔✔- 20 feet
(6 meters)
, Explain Amplitude of Accommodation - CORRECT ANSWER✔✔- its the Lens's change (in
diopters) from a state of no accommodation to maximum accommodation
What does Prince's Rule measure? - CORRECT ANSWER✔✔- near point of
accommodation, and bifocal and trifocal add power
what is the focal length (in meters) of a 3 diopter lens? - CORRECT ANSWER✔✔- P=1/f
3=1/f
3f=1
f=1/3 or 33 cm
Snell's Law determines what - CORRECT ANSWER✔✔- whether the refacted ray will bent
toward the normal or away from it
Index of Refraction (IR) compares what? - CORRECT ANSWER✔✔- Speed of light in a
vacuum to the speed of light in a given substance
What is the IR of Water?
What is the IR of Crown Glass? - CORRECT ANSWER✔✔- Water is 1.33
Crown Glass in 1.517
What is axial length? - CORRECT ANSWER✔✔- The length of the eye from the front
surface of the central cornea to the macula
With the rule astigmatism is at what axis? - CORRECT ANSWER✔✔- 90
Against the Rule astigmatism is at what axis? - CORRECT ANSWER✔✔- 180
Hirschberg Test - CORRECT ANSWER✔✔- uses corneal light reflexes to determine
anestimation of misalignment
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