Random Questions

Question 1

What is legal blindness in Canada?

Answer 1

Worse than or equal to 20/200 with best correction in the better eye or a visual field extent of less than 20 degrees in diameter.

Question 2

Ontario DOT Requirements

Answer 2

• 6/15 or better

- VF >= 120

Question 3

WHO definition of low vision

Answer 3

• 6/18 or worse, but better than 3/60 in the better eye
  OR
• VF less than 10 degrees

Question 4

CNIB Eligiblity

Answer 4

• worse than 6/21 (20/70) to better than 6/60

If vision is better than 6/21, OMD/OD will have to report why they have a visual disability.

Priority for TBI or stroke patients.

Question 5

ADP Eligibility

Assistive Devices Program

Answer 5

• 6/21 or worse
• require long term assistance (6 months+)
• valid OHIP and Canadian residency

Question 6

At what levels do people likely start having visual disabilities?

• VA
• CS
• VF

Answer 6

VA: worse than 6/12
CS: < 1.40
VF: <70 degrees

Question 7

Classical theory of grieving

Answer 7

1. Denial
2. Anger
3. Bargaining
4. Depression
5. Acceptance

Question 8

Just Noticeable Difference (JND)

a) 6/60
b) 6/30
c) 6/15

Answer 8

a) 2.00 D
b) 1.00 D
c) 0.50 D

Question 9

TO DECREASE HEAD TURN:

Where should someone with nystagmus sit if they have a null point of 30 degrees to the left?

Answer 9

Right side.

Question 10

TO DECREASE HEAD TURN:

Where should someone with nystagmus with null point of 30 degrees to the left place their objects?

Answer 10

In the left visual field.

Question 11

To decrease head turn of someone with nystagmus with null point of 30 degrees to the left, which base should the prism be Rx’d?

Answer 11

Base RIGHT.

Question 12

Null point surgery

Answer 12

• only if null point > 45 degrees
• null point is stable
• may return after 15 years

Question 13

Drug therapies to reduce acquired nystagmus (with oscillopsia).

Answer 13

• baclofen
• botulism toxin/Botox
• scopolamine