When the plane has no radar, fighter pilots find enemy planes, and passenger pilots find obstacles in front (such as birds, other planes, typhoon vortex, etc.). ) all by their eyes! Sharp-eyed pilots can find medium-sized aircraft 30 kilometers away in good visibility. Later, with radar, many countries' requirements for vision were not so harsh! However, due to the severe vibration during the flight, the wearing of other equipment and the influence of temperature difference, it is still unrealistic to wear glasses on the plane. So people with good eyesight are still needed to be pilots.
After the 1960s, with the continuous improvement of radar performance and the entry of new equipment such as night vision equipment into the military service, western countries have allowed nearsighted patients to select pilots and also allowed pilots to wear glasses on airplanes. The picture shows an American F4 fighter pilot wearing myopia glasses during the Vietnam War.