Sensory adaption in amblyopia CT

Question 1

How does one assess fixation?

Answer 1

1. MIT (HB)
2. After Image Transfer
3. Angle Kappa
4. Visuoscopy

Question 2

Whats the one thing you do when evaluating EF

Answer 2

cover one eye; it is a monocular manifestation

Question 3

T/F Most of us have a positive angle kappa due to the location of the macula

Answer 3

true

Question 4

what does angle lambda assess

Answer 4

strabismus; it is measured binocularly

Question 5

when are you not supposed to perform after image transfer test

Answer 5

when pt has ARC; you know that the image will not correspond to the fovea of the other eye.

Question 6

Every 20 steps on VA chart is equivalent to how much MAR?

Answer 6

1 MAR;
20/20 = 1 MAR
20/40 = 2 MAR
20/60 = 3 MAR

Question 7

What are tests to diagnose amblyopia

Answer 7

1. Block line letter VA
2. Psychometric VA
3. Neutral Density filter
4. MIT
5. Color vision
6. Amsler grid
7. 2.5 Telescope; improvement in VA will not match the mag of the telescope; it will be dramatically improved if no amblyopia present

Question 8

T/F Aniso amblyopia have CS loss at all spatial frequencies

Answer 8

True

Question 9

what tests do we use to make sure macula is healthy

Answer 9

1. NDF
2. Photo stress test
3. red cap test

Question 10

T/F Suppression is not passive, it is an ACTIVE process. It is a _____ inhibitory reflex that occurs within the extra macular fusion reflex and permits the cortex to ignore visual sensations dispatched from the retina of the non fixating eye, on which are projected the images form the area of conscious regard.

Answer 10

positive; True; it is a common way to avoid retinal confusion

Question 11

what did the bicucline study determine

Answer 11

administered poison and VA improved immediately. Stimulate neuroconduction

Question 12

what did the enuclation study determine

Answer 12

enucleated good eye, amblyopic eye came back to normal. shows that what they did is take away the good eye that didn’t let amblyopic eye work.

Question 13

Suppression scotoma is absolute but also _____bc it is nonexistent during monocular vision. It could be plotted in the non fixating eye only during binocular perimetry.

Answer 13

facultative

Question 14

Which tests detect suppression?

Answer 14

1. 4 worth dot
2. red lens test
3. maddox rod
4. von graefe
5. stereo acuity test
6. NPC

Question 15

what does depth of suppression indicate?

Answer 15

severity and time of onset of the dysfunction

Question 16

what does size of the suppression zone indicate

Answer 16

maximum size of the deviation

Question 17

what does the laterality of the suppression indicate

Answer 17

which eye is the one that is suppressed most of the time.