Lack of optic rod cells may affect dark vision and even lead to night blindness. Photoreceptors are the first level neurons in the retina and are divided into two types: optic cone cells and optic rod cells, of which, optic rod cells sense low light and colorless vision. Therefore, patients are able to feel the stimulation of low light in a dim environment, forming dark vision but no color vision. If the retina lacks optic rod cells, it will affect the patient’s dark vision, and even cause the patient to develop night blindness, which is manifested by the lack of vision at night, and will seriously affect the patient’s daily life. If the patient has poor dark adaptation, or even night blindness, it is recommended that the patient should consult a doctor in time to find out the specific cause, and timely treatment is needed if necessary.