Aniseikonia (M1)

Question 1

What is a relative difference in size and/or shape of the ocular images called?

Answer 1

aniseikonia

Question 2

What is the difference between the retinal image and the ocular image?

Answer 2

retinal is image that falls on retina and ocular is image that is perceived (cortical image)

Question 3

What does the ocular image depend on?

Answer 3

1. retina image
2. retinal mosaic
3. neuronal processing along visual pathway

Question 4

What is an opthalmic lens designed to correct the image size difference between the two eyes and correct refractive error?

Answer 4

eikonic lenses

Question 5

What are the lenses that can correct for aniseikonia?

Answer 5

1. eikonic lenses

2. afocal magnifiers

Question 6

For the space eikonometer, what aspects are impacted by axis 90 magnification?

Answer 6

lines and cross

Question 7

For the space eikonometer, what aspects are impacted by overall magnification?

Answer 7

lines only

Question 8

For the space eikonometer, what aspects are impacted by axis 180 magnification?

Answer 8

cross only

Question 9

For the space eikonometer, what aspects are impacted by oblique magnification?

Answer 9

cross only

Question 10

What are the clinical testing methods for testing size difference that are direct comparison methods?

Answer 10

1. Awaya test
2. Breecher’s procedure
3. Aniseikonia inspector

Question 11

What is the procedure for Brecher’s Procedure?

Answer 11

1. use two penlights and one Maddox rod with size lenses to match
2. ask patient if two lines go through the two lights
3. if both above or below then vertical deviation
4. if one above and one below aniseikonia so match lens until equal

Question 12

Why is the vertical meridian more precise than the horizontal for Brecher’s procedure?

Answer 12

less variability from phoria in vertical than horiz

Question 13

What type of test is the Aniseikonia Inspector computer testing?

Answer 13

2AFC