Ametropia Flashcards Preview

Binocular/Colour/Perceptual Vision > Ametropia > Flashcards

Flashcards in Ametropia Deck (12):
1

Manifest hyperopia

amount of hyperopia found on subjective refraction

2

Latent hyperopia

remaining hyperopia found after cycloplegia

Manifest = +1.00D
Cyclo'd = +2.00D
Latent = +1.00D (2-1)

3

Absolute hyperopia

amount that cannot be overcome by accommodation

4D of hyperopia
1D of accommodation
Absolute = 3D

4

Facultative hyperopia

amount that can be overcome by accommodation

4D of hyperopia
1D of accommodation
Facultative = 1D

5

Latent hyperopies will have a LEAD or LAG in accommodation?

LAG.

Latent hyperopes have to accommodate at distance to account for uncorrected refractive eroror. Near would result in further accommodation and likely lag due to fatigue.

6

What is a NORMAL result for MEM?

+0.25 to +0.50D (represents a small lag)

7

What is an ABNORMAL result for MEM?

>+0.50D (large lag) or any minus (a lead)

8

With-the-rule astigmatism

Negative cyl on 180 axis

9

What add should be prescribed for the followign:

NRA: +3.50
PRA: -1.50

Add: +1.00

(PRA + NRA)/2 = ADD

10

Amplitude of accommodation

18.5 - 0.3(age)

11

If a patient says the green eye chart looks clearer than the red part of the chart - what needs to be tweaked for the Rx?

MORE PLUS!

RAM-GAP
Red add minus || Green add plus

12

What is the mohindra technique?

- pitch dark
- retinoscope

AGE:
<2 = -0.75D (assumes tonic of 1.25D)
<6 = -1D
>6 = -1.25D