Optics Flashcards
1
Q
To increase divergence what type of lens do you use?
A
Concave lens - MINUS lens
2
Q
To decrease divergence…. lens type
A
Convex or PLUS lens
3
Q
In emmetropia - the lens is fatter when…
A
trying to near focus
4
Q
4 things that happen during accommodation
A
- Ciliary muscle contract
- Decrease zonular tension
- lens thickens
- INCREASE refractive power
5
Q
When near objects are out of focus this is called
A
PRESBYOPIA
6
Q
When you have too much convergence… describe the eye
A
Might be too long
or POWER is too high - too much convergence -
Need minus lens
7
Q
With hyperopia
A
- Eye is short, light converges behind retina
- Need more PLUS power (NEAR fails first)
