Night Vision

Question 1

Effect of altitude on night vision

Answer 1

5000 feet loses 5 to 10% of night vision. 10,000 feet loses 15 to 20% of night vision. 12,500 feet loses 25 to 30% of night vision.

Question 2

Use this type of vision for night vision

Answer 2

Peripheral instead of focal

Question 3

Night blind spot

Answer 3

Because cones in the fovea require a highlight levels to function we must learn to focus on a target about 10 to 15° off in any direction to see it best

Question 4

Causes of false horizons

Answer 4

Streetlights perceived as a horizon in the distance. fishing boats perceived as a horizon over the ocean.

Question 5

Black hole affect

Answer 5

Occurs most often during night time visual approach to an airfield without surrounding city lights or with a small concentration of lights behind the runway

Question 6

Autokinesis

Answer 6

Motion of a single light source against a dark background caused by fixation on the object

Question 7

Weather factors

Answer 7

Haze and ground fog. Rain or snow

Question 8

Nighttime vision improvement measures

Answer 8

Helmet visor clear of any scratches or contaminants. 100% oxygen. Low-level cockpit lights