NVG

Question 1

Answer 1

Question 2

What adjusts pupil size to allow light into the eye?

Answer 2

Iris

Question 3

Cone cells

Answer 3

• day/high intensity light (>50% illumination)
• identifies Colors
• high visual acuity

Question 4

Rod cells

Answer 4

• low light
• identifies outlines and motion
• vision in peripheral regions
• no colors, poor resolution
• produce rhodopsin

Question 5

Night blind spot

Answer 5

• fovea centralis
• only cones
• 5-10deg wide
• provides most visual information

Question 6

Day blind spot

Answer 6

• optic disk
• where the optic nerve enters the eye
• compensated by binocular vision

Question 7

Types of vision

Answer 7

Photopic: Daylight, artificial light; central vision
Mesopic: Twilight, moonlight, NVG; most dangerous
Scotopic: Partial moon, stars; off-center vision

Question 8

Rhodopsin

Answer 8

• 30-45min to buildup
• bleached out by bright light

Question 9

Visual acuity
Best NVG vs worst NVG vs best unaided

Answer 9

20/25
20/70
20/200

Question 10

Stop-turn scanning technique

Answer 10

• Z-pattern, stop between turns
• 10deg overlap

Question 11

Binocular cues

Answer 11

• convergence
• stereopsis

Question 12

Monocular cues

Answer 12

• geometric perspective
• retinal image size
• aerial perspective
• motion parallax

Question 13

ANVIS Parts

Answer 13

Objective lens
- minus blue filter
Eyepiece lens
-
PAS
- grab ANVIS only here
Electrical contacts
- clean with pencil eraser

Question 14

Operational defects

Answer 14

Shading
Emission points
Edge glow
Flashing/Flickering/Intermittent Operation

Question 15

Answer 15

Question 16

Answer 16

Question 17

Answer 17

Question 18

Natural light sources

Answer 18

Moon (15deg/s)
Sun
Stars

Question 19

Protective functions

Answer 19

Automatic Brightness Control (ABC)
Bright Source Protection (BSP)