Vision

Question 0

What is the most sensitive part of the cornea for seeing detail?

Answer 0

Fovea

Question 1

What are rods and cones for?

Answer 1

Night and colour vision respectively

Question 2

Why dies the eye have a blind spot?

Answer 2

It is the junction of the optic nerve

Question 3

How long does it take for visual purple to reach full concentration in the rods? What is the effect of a flash?

Answer 3

Up to 30m but a flash can destroy it

Question 4

The part of the eye that expands and contracts is the …?

Answer 4

Iris

Question 5

How long can prolonged exposure to glare affect niggt vision?

Answer 5

1 week!

Question 6

Why should cockpit lights be red?

Answer 6

Does not affect rods

Question 7

Why should you avoid other aircraft strobes or landing lights at niggt?

Answer 7

White light affects night vision

Question 8

What is the term for detail perception?

Answer 8

Acuity

Question 9

What is an environmental condition that affects acuity?

Answer 9

Light levels

Question 10

What colour perception is required for pilots?

Answer 10

Red/white (for some ground based aids)

Question 11

After the age of 40, lenses become more rigid, what should you do?

Answer 11

Have your DAME refer you to an aviation optometrist for the right glasses

Question 12

At what distance can you see a 1m disk with perfect vision?

Answer 12

2nm

Question 13

At 2nm how would an approaching aircraft appear?

Answer 13

No wings - a dot, stationary on windscreen thus not registering on movement perception

Question 14

What is a saccade and how should it be allowed for?

Answer 14

Period of no visual perception while the eye moves.

Move head 20-30 degrees then pause

Question 15

What illusion is caused by heavy rain?

Answer 15

Less distinct vision is interpreted as greater distance so distance is overestimated

Question 16

Why is night vision degraded by altitude and when?

Answer 16

Rods are very susceptible to lack of O2- beyond 4000ft