Night blindness in dim light or night vision, the patient can not accurately determine whether it is night blindness, the doctor can make a definitive diagnosis based on medical history, clinical symptoms and related examination.
1. Medical history: whether the patient has vitamin A deficiency or certain digestive system diseases as well as congenital hereditary eye diseases such as retinitis pigmentosa. These diseases may cause night blindness.
2. Clinical manifestations: Normal vision in the daytime or in a well-lit place, but blurred vision at night or in low light, accompanied by frequent blinking, reduced tears, dry eyes, narrowed vision and other symptoms.
3. Auxiliary examination: plasma vitamin A measurement, dark room test, visual field examination, fundus examination and so on can be used to more accurately determine whether there is night blindness.
If you suspect that you have night blindness, it is recommended that you consult a doctor in a timely manner, follow the doctor’s instructions to conduct relevant examinations, clarify the cause with the doctor’s help, and carry out targeted treatment or therapy.