Difficulty seeing at night is mainly seen in the following two conditions: the first, cataracts. The light is darker at night than during the day, and the cloudy lens blocks some of the light, so less light enters the eye than during the day, which makes seeing at night blurry. The second type, retinitis pigmentosa, is also commonly known as night blindness. Retinitis pigmentosa is a genetic disorder caused by a congenital abnormality in the development of photoreceptors. In this case, it is best to wear sunglasses to protect the photoreceptor cells of the retina when you go out during the day, and to brighten the lights at night, and to eat more things like lutein and vitamin A to protect the retina.