A healthy person can experience vision deterioration at altitudes as low as 5,000 feet due to diminished oxygen. A smoker s threshold may be a great deal lower and sometimes will not improve even with supplemental oxygen. A few of the unique visual illusions that can appear at night were briefly mentioned. Let me provide a little more detail on these human limitations. The creation of a false horizon is one of the most serious night illusions.
Instrument proficiency can be a lifesaver during the black hole effect.
If you have, you ve experienced visual autokinesis . Pilots get into trouble with this effect because they perceive the moving light as another aircraft on a collision course. To prevent this illusion, keep your off-center scan moving and the light will remain stationary. I ll talk about is normally caused by reflections of a strobe light off the clouds. It is called flicker vertigo and can incapacitate through nausea, dizziness, grogginess, headache or confusion.