Night Vision

Question 1

Where are cone cells primarily located? What are the responsible for?

Answer 1

Fovea, responsible for best visual acuity

Question 2

What is the role of the flight surgeon with respect to NVG use and training?

Answer 2

• Ensure annual exams complete

- Assist trained trainer

Question 3

Cones or rods, which is used at night?

Answer 3

Rods

Question 4

What is the best visual acuity at night?

Answer 4

20/200

Question 5

Cones or rods, which is used to view an NVG image?

Answer 5

Cones, unless lower ambient illumination in which both cones and rods are used

Question 6

What is the wavelength of light seen by NVG and FLIR?

Answer 6

NVG- just longer than visible light

FLIR- much longer than visible light, down in IR range

Question 7

What does FLIR stand for?

Answer 7

Forward Looking Infrared

Question 8

List 4 visual limitations of NVGs

Answer 8

1. Gain
2. Reduced visual acuity (20/20-30 udner ideal conditions; 20/80 in low contrast conditions–which is best tactically)
3. Limited field of vision
4. Monochromatic image– limited object detection and recognition

Question 9

Can an incompatible cockpit display be made compatible by turning it down?

Answer 9

NO

Question 10

List 3 factors that influence NVG performance.

Answer 10

1. Particulate in air
2. Cockpit displays
3. Improper adjustment

Question 11

Describe the problem with visual perception using NVGs.

Answer 11

Desire to make object appear as it does during daytime causes you to get too close, fly abnormal flight path/attitude

Question 12

List 4 items it is difficult to see with NVGs. What can assist with seeing these objects?

Answer 12

1. Power lines/poles
2. Trees without leaves
3. Ridge lines
4. LEDs (IR)

FLIR can help see these objects