Prism Flashcards
1
Q
What does a prism do?
A
Deviates the light rays to a particular direction
Prevents double vision
Corrects strabismus
2
Q
Not direction of prism
A
Base in
Base out
Base up
Base down
3
Q
What is an induced prism
A
A prism caused by decentering
And causes unwanted effects
4
Q
Fresnel Prism definition
A
Peel and stick to lens
5
Q
Prentice’s Rule
A
The formula used to calculate the amount of prism
P=(h)(d)
6
Q
Define the prentice formula
A
P= prism power (D)
H= the distance between optical center of the lens and the position where the eye is looking through the lens (CM)
D= the power of the lens (D)
