Cataracts may cause vision loss, blurred vision, refractive changes, color vision changes and other symptoms. 1. Loss of vision: Cataract will cause clouding of the lens, the light transmitting ability of the lens is low, resulting in loss of vision, and the symptoms are more obvious in bright light. 2. Blurred vision: The clouding of the lens will cause the patient to see things blurred, as if there is a fog in front of their eyes. 3. Refractive changes: the disease will cause the refractive ability of the lens nucleus to increase, the emergence of nuclear myopia, with the progress of the disease, the original symptoms of presbyopia will be relatively reduced; the patient may also have symptoms of lens astigmatism. 4. Color vision change: turbidity of the lens will lead to increased absorption of blue light, the patient’s ability to reduce color vision. Ocular cataracts may also have symptoms such as decreased contrast sensitivity, diplopia, fixed black shadows, visual field defects, etc. It is recommended that the patient consult a doctor for treatment in a timely manner.