What visual issues may pilots experience at high altitudes?

Pilots flying at high altitudes may experience diminished visual sharpness and depth perception due to several physiological factors. At high altitudes, the reduced atmospheric pressure can lead to less oxygen being delivered to the eyes and the brain, potentially impacting overall visual acuity. This lack of oxygen can affect not just clarity of vision but also how well a pilot can perceive the distance and spatial relationships of objects, crucial for navigating during flight.

Furthermore, the effects of altitude on the body can include changes in eye pressure and the way the lenses of the eyes focus light, which may contribute to these visual impairments. These factors combined highlight the importance of understanding visual limitations at high altitude, as they directly influence a pilot's ability to perform flight operations safely and effectively.