The patient’s inability to see at night mostly refers to night blindness, which may be caused by vitamin A deficiency, retinitis pigmentosa and other reasons.
1. Vitamin A deficiency: if the patient because of insufficient intake or absorption of vitamin A, vitamin A deficiency can occur, so that the retinal rod cells in the synthesis of retinal purplish red matter is affected, which will affect the dark environment vision, resulting in the patient can not see things at night.
2. Retinitis pigmentosa: Retinitis pigmentosa is a dystrophic degenerative disease of photoreceptor cells and pigment epithelium, in the early stage, patients may have trouble seeing at night, with the development of the disease, patients may have vision loss, atrophy of the optic papillae and other manifestations.
It is recommended that patients who have difficulty seeing at night should consult a doctor to evaluate their condition and follow the doctor’s instructions for treatment.