clouding of the lens.

 lack of mobility of the cornea.

mis-shapen cornea.

lack of accommodation at the cornea.

governed by peripheral vision over an area of approximately 20 degrees of angle.

limited to daytime using the rod cells.

 limited to the foveal area of the retina.

almost equally shared by the entire retina.

Red blood cells.

Platelets.

Blood plasma.

White blood cells.

25 000 ft

43 000 ft

30 000 ft

35 000 ft

The pilot will be able to correctly assess their relative position and speed, but may be unaware of the increased landing distance required. They should consult their performance charts before the flight to ensure that the aircraft can safely land at the aerodrome.

The pilot will feel that they are further out on the descent path and may reduce thrust too late, resulting in an overshoot. They should pay careful attention to their approach speed.

The pilot may believe that they are flying too fast, resulting in an early thrust reduction and lack of energy. They should be careful not to reduce below the specified approach speed.

The pilot may have the impression that they are above the correct approach path, resulting in an increased rate of descent and possible undershoot. They should believe their instruments.