夜盲症, or night blindness, is a condition that affects a person's ability to see in low light or darkness. It is often caused by a deficiency in vitamin A, which is essential for the production of rhodopsin, a pigment in the retina that helps with night vision. Other causes can include certain eye diseases, such as retinitis pigmentosa or cataracts. People with 夜盲症 may struggle to see clearly when transitioning from bright to dim environments, making activities like driving at night particularly challenging. Treatment typically involves addressing the underlying cause, such as improving vitamin A intake or managing eye conditions. Regular eye check-ups can help in early detection and management.