NVG ACADEMICS Exam And Correct
Answers
Contains both types of photo receptor cells - Answer -✔✔parafovea
contains only rods but motion is more easily noticed. Helps prevent against vestibular
illusions during the day - Answer -✔✔peripheral
This type of vision is experienced during daylight or under high levels of artificial
illumination. Cones work better than rods. Uses central vision. - Answer -✔✔photopic
Where the level of illumination varies between light and dark is.... usually dusk, dawn
and under bright moonlight. Also the most dangerous visual condition for unaided
crewmembers - Answer -✔✔mesopic
This type of vision is experienced in light environments below 50% illumination such as
partial moonlight and starlight conditions. Rods are the primary source of visual input. -
Answer -✔✔Scotopic
Scotopic vision requires... - Answer -✔✔scanning, off-center and peripheral vision.
The photopigment in the rods is called _____. Also known as visual purple. High levels
of light will bleach it out. - Answer -✔✔Rhodopsin
The average time for dark vision adaptation is - Answer -✔✔30-45 minutes
If a crew is already dark adapted and they remove the device... and then put it back on.
A 30 minute dark adaptation level will take about.... - Answer -✔✔2-3 minutes
The ____ is the transparent protective tissue located over the front of the eye - Answer
-✔✔cornea
The ___ contains ciliary muscle which automatically adjusts the size of the pupil and
regulates the amount of light entering the eye - Answer -✔✔Iris
The ____ flexes and will harden with age which causes presbyopia - Answer -✔✔lens
The ___ covers most of the black of the eye and contains many tiny photo receptors
known as rods and cones - Answer -✔✔retina
____ cells provide color vision, but only function in high illumination. lowest they go is
50% illum - Answer -✔✔cones
, These cells are always functioning and allow us to see movement and identify the
outlines and shapes of silhouettes - Answer -✔✔rods
what percent illum is defined as the light level produced by a full moon at max azimuth
on a clear night - Answer -✔✔100
The high-concentration area of cones is known as the... - Answer -✔✔fovea
The fovea has no rod cells and this area a 5-10 degrees wide, known as the... - Answer
-✔✔night blind spot
The optic disk is there the optic nerve enters the retina and because it has no rods or
cones... it is also called the - Answer -✔✔day blind spot
Always wear ____ sunglasses to protect your night vision - Answer -✔✔gray
You should eat food that is high in vitamin __ to help with night vision - Answer -✔✔A
Dark adaptation of the rods develops over a period of - Answer -✔✔30-45 minutes
Complete dark adaptation recovery time after being exposed to a bright light may take
anywhere from _ to _ minutes. - Answer -✔✔5-45
Aviators should look away from bright lights and ___ one eye - Answer -✔✔close
The ___ ___ ___ ___ motion scanning technique should be used during unaided flight
to detect objects - Answer -✔✔stop turn stop turn
This binocular cue measures the difference between the physical angles between the
two eyes - Answer -✔✔convergence
This binocular cue combines and compares the pictures provided by the two eyes -
Answer -✔✔Stereopsis
These cues are subject to interpretation and are derived from experience - Answer -
✔✔monocular
The 4 monocular cues are... - Answer -✔✔Geometric perspective, Retinal Image Size,
Aerial Perspective and Motion Parallax
This cue has an object appearing to have a different shape when it is viewed at varying
distances and from different angles - Answer -✔✔geometric perspective
Answers
Contains both types of photo receptor cells - Answer -✔✔parafovea
contains only rods but motion is more easily noticed. Helps prevent against vestibular
illusions during the day - Answer -✔✔peripheral
This type of vision is experienced during daylight or under high levels of artificial
illumination. Cones work better than rods. Uses central vision. - Answer -✔✔photopic
Where the level of illumination varies between light and dark is.... usually dusk, dawn
and under bright moonlight. Also the most dangerous visual condition for unaided
crewmembers - Answer -✔✔mesopic
This type of vision is experienced in light environments below 50% illumination such as
partial moonlight and starlight conditions. Rods are the primary source of visual input. -
Answer -✔✔Scotopic
Scotopic vision requires... - Answer -✔✔scanning, off-center and peripheral vision.
The photopigment in the rods is called _____. Also known as visual purple. High levels
of light will bleach it out. - Answer -✔✔Rhodopsin
The average time for dark vision adaptation is - Answer -✔✔30-45 minutes
If a crew is already dark adapted and they remove the device... and then put it back on.
A 30 minute dark adaptation level will take about.... - Answer -✔✔2-3 minutes
The ____ is the transparent protective tissue located over the front of the eye - Answer
-✔✔cornea
The ___ contains ciliary muscle which automatically adjusts the size of the pupil and
regulates the amount of light entering the eye - Answer -✔✔Iris
The ____ flexes and will harden with age which causes presbyopia - Answer -✔✔lens
The ___ covers most of the black of the eye and contains many tiny photo receptors
known as rods and cones - Answer -✔✔retina
____ cells provide color vision, but only function in high illumination. lowest they go is
50% illum - Answer -✔✔cones
, These cells are always functioning and allow us to see movement and identify the
outlines and shapes of silhouettes - Answer -✔✔rods
what percent illum is defined as the light level produced by a full moon at max azimuth
on a clear night - Answer -✔✔100
The high-concentration area of cones is known as the... - Answer -✔✔fovea
The fovea has no rod cells and this area a 5-10 degrees wide, known as the... - Answer
-✔✔night blind spot
The optic disk is there the optic nerve enters the retina and because it has no rods or
cones... it is also called the - Answer -✔✔day blind spot
Always wear ____ sunglasses to protect your night vision - Answer -✔✔gray
You should eat food that is high in vitamin __ to help with night vision - Answer -✔✔A
Dark adaptation of the rods develops over a period of - Answer -✔✔30-45 minutes
Complete dark adaptation recovery time after being exposed to a bright light may take
anywhere from _ to _ minutes. - Answer -✔✔5-45
Aviators should look away from bright lights and ___ one eye - Answer -✔✔close
The ___ ___ ___ ___ motion scanning technique should be used during unaided flight
to detect objects - Answer -✔✔stop turn stop turn
This binocular cue measures the difference between the physical angles between the
two eyes - Answer -✔✔convergence
This binocular cue combines and compares the pictures provided by the two eyes -
Answer -✔✔Stereopsis
These cues are subject to interpretation and are derived from experience - Answer -
✔✔monocular
The 4 monocular cues are... - Answer -✔✔Geometric perspective, Retinal Image Size,
Aerial Perspective and Motion Parallax
This cue has an object appearing to have a different shape when it is viewed at varying
distances and from different angles - Answer -✔✔geometric perspective
