Unit 2: Eyeglass Needs Assessment

Question 1

Types of astigmatism

Answer 1

Corneal- Cornea is shaped weird
Lenticular- Lens is shaped weird
Axial- Access is off

Question 2

With the rule astigmatism

Answer 2

-Steeper axis at 90
-More common in younger and myopic patients
-Topography is a red eight

Question 3

Against the rule astigmatism

Answer 3

-Steeper axis at 180
-More common in older patients
-Shaped like a red bow tie on topography

Question 4

Add powers at what ages

Answer 4

40-44: +1.00
45-49: +1.50
50-59: +1.75
60-64: +2.00

Question 5

Thin mires in lensometer are these

Answer 5

Sphere

Question 6

Thick mores in lensmetre are these

Answer 6

Cylinder

Question 7

The goal in determining what kind of lens to use

Answer 7

The lowest index of refraction possible

Question 8

Types of progressive lenses

Answer 8

-General progressives
-Reading focussed progressives
-Computer focussed progressives
-Room focussed progressives
-Task specific progressives

Question 9

Prentice’s rule

Answer 9

P=cF where
P=power in diopters
c= distance from optical centre (ALWAYS IN cm)
F=Back vertex power of the lens

Question 10

Average adult pupillary distance

Answer 10

54-70+ mm