Symptoms of cataracts often vary depending on the type of cataract and the course of the disease. Cataracts often develop in both eyes, but the onset may be sequential and the severity may vary. The main symptoms are an immediate shadow and progressive, painless loss of vision. The clinical manifestations vary depending on the location of the clouding. Shanghai Long March Hospital Ophthalmology Li Yu 1, cortical cataract, early stage does not affect vision; after the development of the check vision good 0.6, to read books and newspapers in bright light. Some people read books clear in dark light, central clouding. Some develop slowly (fissure) and develop quickly (fissure clouding).
2, nuclear cataract such as highly myopic eyes, in the process of vision loss may appear refractive power enhancement, both the original myopia increased or the original presbyopia reduced, some people who usually need to wear presbyopic glasses can even remove glasses to read newspapers and books, the second vision.
3. Overlap of what is seen occurs. Contrast sensitivity decreases in strong light, and glare occurs at night under headlights. France Monet is a famous impressionist painter, it is said that his fame is related to cataracts. Early did not become famous painting Bridge over a Pool of Water Lilies, the painting style is delicate and realistic colors. Later got due to eye disease got cataract after the bold use of bright colors became a master of impressionism, because of the decline in contrast sensitivity.
4.Symptoms such as monocular diplopia or hyperopia, iridopsia, photophobia and glare may also occur.
Generally speaking, the symptoms develop slowly, but patients with systemic diseases such as diabetes or with localized eye diseases such as high myopia, post-operative glaucoma, retinitis pigmentosa, uveitis, etc., cataracts will occur earlier and progress faster.