about night blindness 請翻譯為英文

The moon blindness is getting up because eyes can't produce the visual purple . Visual purple can let people among night , even the faint light can see some things only.

¡ïSeek the form
In the pitch-dark environment, can not see the things under the faint light .

¡ïOrigin cause of formation
Vitamin A is the necessities which supplements the visual purple, patients are mostly malnutritive seriously or it is caused that vitamin A is insufficient.
Suffering from a kind of hereditary disease which is called the pigment retinitis, this disease is very rare, but begin in the initial stage of childhood , worsen gradually , can result in losing one's sight ten to 50 years later.

Night blindness is caused by the insufficient production of visual pigments. Visual pigments is needed for us to see things clearly in dim light.

Symptoms of having night blindness:
You won't be able to see anything in dim night.

THe cause of Night blindness:
Vitamin A is needed to form visual pigments. People suffering from nightblindness has a deficiency of Vitamin A in their bodies. This deficiency disease is very common nowadays. Once you suffer from this kind of disease, you might have the chance of becoming blind.