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IERW - Schmitt > BWS NVG > Flashcards

BWS NVG Flashcards

1
Q

CoL

What component of the eye adjusts pupil size to allow light into the eye?

A

Iris

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2
Q

CoL

_____ cells are less effective as light levels decrease

A

Cone

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3
Q

Photopic Vision

A

Daylight vision or under strong artificial lighting
High visual acuity and colors
Central vision

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4
Q

Mesopic Vision

A

Under twilight, full moon or ANVIS
Decreased acuity and Color perception
Central and off-Center vision

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5
Q

Scotopic Vision

A

Under partial moonlight, stars
Low acuity, no colors, only shapes/motion
Off-Center vision

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6
Q

CoL

Which type of vision is characterized by lack of color perception and requires off-center viewing?

A

Scotopic Vision

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7
Q

Rhodopsin

A

30-45min to build up
Bleached out by bright light

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8
Q

CoL

How long does it take to recover dark adaptation due to exposure to a bright light?

A

5 - 45 min depending on duration and intensity of exposure

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9
Q

Night Blind Spot

A

Occurs due to total absence of rod cells in the fovea and lack of rod cell stimulation within the parafoveal regions. Compensation via using proper scanning techniques and off center viewing

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10
Q

Day Blind Spot

A

Optic disc, contains no rods or cones. Point where optic nerve enters retina. Compensation via viewing with binocular vision

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11
Q

CoL

How large is the night blind spot?

A

5 to 10 degrees

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12
Q

Stop-turn-stop-turn technique

A

Z-pattern
Stop before each turn
10deg overlap between stops

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13
Q

Ten degree circular overlap

A

To compensate for 5-10deg night blind spot

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14
Q

Off center viewing

A

Look at target 10deg left, right, below or above to compensate for night blind spot

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15
Q

CoL

Why is the circular overlap in scan pattern 10 degrees?

A

To ensure coverage of an area greater than the night blind spot

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16
Q

Monocular Cues

G

R

A

M

A

Geometric perspective
Retinal image size
Aerial perspective
Motion parallax

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17
Q

Motion Parallax

A

Apparent, relative motion of stationary objects as viewed by a moving observer.

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18
Q

What information does motion parallax provide aviators?

A

Aircraft speed and direction of movement

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19
Q

ADD ALL VISUAL ILLUSIONS

A
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20
Q

Add description of the parts of NVG

A
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21
Q

Best Case NVG acuity

A

20/25

22
Q

Worst Case NVG acuity

A

20/70

23
Q

Unaided Visual acuity

A

20/200

24
Q

Light spectrum and NVG sensitivity

When does the NVG spectrum starts?

A

600 or more

Orange/ Red Light

25
Q

CoL

Which component of the Image of the Image Intensifier is responsible for creating the monochromic viewing image?

A

Phosphor Screen

26
Q

CoL

True or False? Because the ANVIS’s eyepiece can correct for individual eye acuity, operaters are not required to wear normally required eyeglasses

A

False

27
Q

Operational Defects

S
E
E
F

A

Shading
Emission Point
Edge Glow
Flashing/ Flickering and Intermittent Operation

28
Q

Cosmetic Blemishes

I
F
I
C
B
O
B

A

Image Distortion
Fixed Pattern Noise
Image Disparity
Chicken Wire
Bright Spots
Output Brightness Variation
Black Spots

29
Q

What is the biggest source of ambient light at night?

A

Moon (moves 15 degrees per hour)

30
Q

CoL

What are the natural sources of illumination

A

Sun, Moon, Stars

31
Q

CoL

What factors increase the likelihood of SD?

A

Degraded visual Acuity
Fatigue
High Task Loading
Reduced FOV
Inexperience

32
Q

What do NVG see?

A

Normal visable spectrum plus near IR

33
Q

Automatic Brightness Control…

A

…constantly varies the intensity of electricity applied to the Microchannel Plate to regulate the Brightness

34
Q

Brightsource Protection…

A

…regulates the amount of electrons that hit the Microchannel Plate in case of a unexpected bright light source

35
Q

CoL

If ambient light levels unexpectedly decrease, what indications may be present?

A

Scintillation
Change in halo intensity
Loss of celestial lights
Loss of ground lights
Noticable loss of scene detail

36
Q

CoL

Battlefield light sources can negatively impact the ANVIS image due to what power supply functions being activated?

A

Automatic Brightness Control
Bright Source Protection

37
Q

Recover Time of bright light exposure?

A

Up to 45 min depending on intensity of exposure

38
Q

CoL

Effective use of monocular cues requires ____ and ____ in various terrain types and flight environments

A

Training and Experience

39
Q

Most common form of LZ marking

A

inverted Y

40
Q

Average dark adaption time

A

30 - 45 min

41
Q

Primary considerations of command?

A

Crew endurance

42
Q

Route Planning

Avoid ________ areas.

A

Bright lit

43
Q

Who has to be at the formal brief?

A

Everybody

44
Q

Distance between two light sources to mark the LZ?

A

15 feet

45
Q

Must be supplemental light green/ red?

A

False

46
Q

What is the most desirable instrument brightness?

A

Lowest easily readable brightness

47
Q

Do you have to turn in the googles because of cosmetic blemishes?

A

No

48
Q

In which time does sky glow normally takes place?

A

Within one hour before sunrise or after sunset

49
Q

Primary side of the battery?

A

Right side

50
Q

The ______ flexes so the light entering the eye is properly focused
on the retinal wall

A

Lens

51
Q

________ cells are used primarily for day or high intensity light
vision (viewing periods or conditions). ________ cells are used for
night or low-intensity light vision (viewing periods or conditions).

A

Cone
Rod

52
Q
A

IERW - Schmitt (30 decks)

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