cataract

All kinds of reasons such as aging, inheritance, local nutritional disorders, immune and metabolic abnormalities, trauma, poisoning, radiation, etc. can cause lens metabolism disorders, resulting in lens protein degeneration and turbidity, which is called cataract. At this time, the light is blocked by the turbid lens and cannot be projected on the retina, so the object cannot be seen clearly. From the perspective of group blindness prevention and blindness control, the World Health Organization degenerates and opacifies the lens, becomes opaque, and even affects vision. Corrective vision of 0.7 or below is included in the scope of cataract diagnosis.