How can a pilot prevent Empty Field Myopia?

By deliberately focusing on a distant object such as a cloud edge or a wingtip.

By maintaining a constant instrument scan and trusting the indications.

By wearing their corrective lenses.

By scanning the sky for other aircraft.

One illusion that pilots experience in conditions of fog or mist are that objects appear to be..

further away than they really are and this can lead to steep approaches.

closer than they really are and this can lead to shallow approaches.

further away than they really are and this can lead to shallow approaches.

closer than they really are and this can lead to steep approaches.

Compared with day operations, what differences should a pilot adopt when seeking to identify a possible collision threat at night?

Move the eyes in small arcs to induce a moving image on the retina for the rods to identify.

Spend twice as much time with the eyes remaining still during each saccade of the lookout scan.

Focus on the instrument panel to allow the rods to identify objects outside.

Cover one eye to avoid being affected by the “blind spot”.

During a night flight at 10000 feet you notice that your visual acuity has decreased. In this case you can increase your acuity by..

breathing supplementary oxygen.

scanning sectors of the field of vision.

An upsloping runway makes the pilot...

Think he’s too high, leading him/her to land short.

Establish a higher than normal approach speed.

Think he’s too high, leading him/her to land long.

Think he’s too low, leading to a steep approach landing long.

an increase in pressure of the liquid within the eye.

a drop in pressure of the liquid around the eye.

damage to the eyeball due to high altitude.

Which of the following problems can be caused by wearing contact lenses?

Increased corneal damage due to mild hypoxia and dehydration.

A reduction in colour vision, especially at high altitudes.

Poor peripheral vision and occasional misting.

The lenses may become dislodged when the humidity is too high.

Name the most important parts of the eye in the order they are met by the light entering the eye, until it reaches the visual cortex.

Cornea, iris and pupil, lens, retina.

Cornea, lens, iris and pupil, retina.

Lens, iris and pupil, cornea, retina.

Lens, iris and pupil, retina, cornea.

When does the blind spot on the retina become significant for a pilot?

If another aircraft is on a converging course and the pilot's field of view is restricted on one side, the pilot might fail to see the other aircraft if it is positioned in the blind spot of the unobstructed eye.

When an aircraft is approaching from head-on, it will disappear for a moment as it passes the blind spot on the retina. It will remain undetected until the relative position of the aircraft changes.

If the pilot's vision is unrestricted and is focused directly ahead, in conditions of low forward visibility, the aircraft converging its track may go undetected if it falls in the blind spot of the eye.

When flying in conditions of low forward visibility, the existence of the blind spot on the retina of each eye can make the judgement of the distance of other traffic more difficult for the pilot.

What causes colour blindness?

Absence of a certain group of cones.

Absence of a certain group of rods.

The cones and rods are placed in a random order.

Which of the following may reduce the likelihood of empty field myopia?

Scan for aircraft using peripheral vision.

Avoid low flying over featureless terrain or water.

Try to fix your gaze on the horizon.

One should concentrate only on the instruments.

When flying in gradually deteriorating visual conditions, what strategy will help the pilot to avoid spatial disorientation?

Rely increasingly on the indications of the flight instruments.

Reduce environmental factors such as stress and distractions.

Keep head and eye movements to a minimum.

Trust the body’s kinaesthetic sense of movement.

The "Black hole" phenomenon occurs during approaches at night and over water, jungle or desert. When the pilot is lacking visual cues other than those of the aerodrome there is an illusion of..

being too low, flying a steeper approach than normal.

being too high and too far away, dropping low and landing short.

HPL06

Authored by Enrique De la h

Specialty

Professional Development

Used 2+ times

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25 questions

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MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Generally, the time required for dark adaptation is..

10 min.

1/10 sec.

10 sec.

30 min.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Accommodation is the...

ability of the eye to alter its focal length.

capacity of the eye to resolve detail.

bending of light when it moves from one medium into another.

perception by the brain from nerve inputs originating in the fovea.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Empty field myopia is caused by…

a lack of distant focal points.

ozone at altitude.

atmospheric perspective.

flying over mountainous terrain.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What illusion can you expect when landing on a larger runway than you are used to?

You flare too low.

You flare too high.

You land short.

You undershoot the runway.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Presbyopia..

is partial visual loss due to pressure changes in the eye.

is common over the age of 50.

is caused by long-termed exposure to stimuli over 90 dB.

is usually treated by surgical replacement of the lens and is compatible with flying.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

When the optical image forms in front of the retina the person is considered to be..

unable to focus on near objects.

suffering from cataracts.

long-sighted.

short-sighted.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Which of the following options is one of the difference between cones and rods in the eye?

Most of the rods are in the fovea and most cones are in the outside area.

Rods have high visual acuity while cones observe colours.

Cones are more sensitive to colours than rods.

Cones are more sensitive to light than rods.

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