Dark light and poor vision can be considered to be related to causes such as night blindness, refractive errors or cataracts.
1. Night blindness: it can be related to vitamin A deficiency, retinitis pigmentosa and other etiological factors, and manifests itself as difficulty in seeing objects and orientation in low light, especially at night.
2. Refractive error: when presbyopia occurs, in the case of insufficient light or darkness, the pupil increases, the depth of field becomes shorter, and it is more blurred when reading at a close distance, and the self-perceived vision is worse; when there is nearsightedness, if the degree of myopia is not corrected in time or the corrective lenses are not worn, the night vision may be poor.
3. Cataract: After cataract occurs, due to the clouding of the lens, resulting in different degrees of visual field defects, which leads to less light entering the eyes and poorer vision when the light is dim or at night.
If you experience poor vision in low light, consult your doctor to determine the cause of the problem and follow your doctor’s instructions.