Optics

Question 1

To increase divergence what type of lens do you use?

Answer 1

Concave lens - MINUS lens

Question 2

To decrease divergence…. lens type

Answer 2

Convex or PLUS lens

Question 3

In emmetropia - the lens is fatter when…

Answer 3

trying to near focus

Question 4

4 things that happen during accommodation

Answer 4

1. Ciliary muscle contract
2. Decrease zonular tension
3. lens thickens
4. INCREASE refractive power

Question 5

When near objects are out of focus this is called

Answer 5

PRESBYOPIA

Question 6

When you have too much convergence… describe the eye

Answer 6

Might be too long
or POWER is too high - too much convergence -
Need minus lens

Question 7

With hyperopia

Answer 7

• Eye is short, light converges behind retina

- Need more PLUS power (NEAR fails first)