Visual Illusions

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Visual Illusions

• Fire, Fire, Fire!!
• CRASH
• SAR

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GENERAL INFORMATION

• The visual system is the most important in
  maintaining equilibrium and orientation
• A decrease in visual information increases the
  probability of spatial disorientation
• Reduced visual references also create several
  illusions that can induce S.D.

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Visual Illusions

• F alse Horizons
• F licker Vertigo
• F ixation
• C onfusion with Ground Lights
• R elative Motion
• A utokinesis
• S tructural Illusions
• H eight Perception Illusion
• S ize Distance Illusion
• A ltered Planes of Reference
• R eversible Perspective

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FALSE HORIZON ILLUSION

• Misinterpretation of the Horizon

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FLICKER VERTIGO

• Light flickers at a rate of 4 to 20 cycles per
  second.
• May cause nausea, vomiting convulsions and
  unconsciousness.

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FASCINATION / FIXATION

• Pilot intent on hitting target.
• Pilot forgets to fly aircraft.
• Fly into target or ground.

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CONFUSION with GROUND LIGHTS

• Confuse ground light with stars

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RELATIVE MOTION ILLUSION

• Motion between you and a moving object.
• Confusing as to who is moving.

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AUTOKINETIC ILLUSION

• Lack of Visual References.
• Off -Center Vision and Scanning Pattern.

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STRUCTURAL ILLUSION

• Curved glass, heat waves, rain, snow,
• sleet, or other disturbance.
• Disturbance / Distortion

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HEIGHT PERCEPTION ILLUSION

• Flying over sand, snow, or water.
• Flying through haze, smoke, or fog.

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SIZE DISTANCE

• False perception of distance from an object
• on the ground or in the air.
• Misinterprets an unfamiliar objects size to
• be the same as an object they are normally
• accustomed to viewing.

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ALTERED PLANES of REFERENCES

• Approaching a line of clouds or mountains.
• Climb in altitude.
• Tend to tilt away from the clouds.

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REVERSIBLE PERSPECTIVE

• Can happen day or night.
• Corrective actions.
• Observe the aircraft lights.
• RED, RIGHT, RETURNING

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• Questions