Why is astigmatism worse at night than during the day?

Astigmatism night vision is worse than the day may be related to the natural environment, congenital factors, night blindness and other reasons.

1, the natural environment

night environment is dim, insufficient light, and astigmatism patients at night pupils will become larger, condensing ability will also decline, will lead to night vision is worse than the day.

2, congenital factors

If the patient's eyes congenital abnormalities, retinal photoreceptors and pigment epithelial cells abnormal, there will be night vision is worse.

3, night

blindness is mainly caused by lack of vitamin A in the body, if astigmatism patients long-term partial eclipse, picky food, etc., easy to cause night blindness, to night vision will be worse than the day.