When we move from dark to light, we fail to see for some time but soon the visibility become normal. It is

When we migrate from dark to light, we fail to see for sometimes but after a time visibility becomes normal. It is example of

while comping out from a dark room into bright light we are not able to see for some time. This occurs due to

As we move up from the surface of the earth air becomes,

Why does a person not able to see for some time when he comes out of a well lighted room at night or enters a dark room at day time?

As we move away from the surface of the earth the air becomes