What are the symptoms of cataract: 1. Dark shadow in front of the eyes: Part of the clouding of the lens is located in the pupil area, and a dotted or lamellar shadow with fixed position and constant shape can appear in front of the eyes. It is different from the flying mosquito caused by vitreous opacity, the latter’s dark shadow is movable, although the range of activity is not large, but sometimes faint and variable in shape.
2, eye presbyopia reduction: Some elderly people usually need to wear presbyopic glasses to read books and newspapers, but suddenly, they found that they do not need to wear presbyopic glasses to see clearly, some elderly people are very happy, in fact, this is not a good sign, this is because the initial onset of cataract, the lens convexity increased, refractive near point change, is one of the early symptoms of cataract.
3.Abnormal color vision: As the lens absorbs more water and swells, its epithelial cell gap increases and fills with particulate water droplets, light will be refracted through it and present colored halo, commonly known as iris vision.
4.Monocular hyperopia: The lens is partially cloudy and partially transparent, and the object image projected onto the retina through it will produce double or multiple shadows.
5, abnormal color vision: Because the lens absorbs more water and swells, its epithelial cell gap increases and fills with particulate water droplets, light will be refracted through it and present colored halo, commonly known as iridopia.
6, day blindness or night blindness: If the lens clouding begins in the central part, the light is strong during the day, when the pupil is narrowed, the light is blocked from entering the eye, thus appearing day blindness; if the lens clouding is located in the peripheral part, the dark light is blocked from entering the equatorial retina at night, and the rod-shaped retinal cells in the equatorial part are specialized in fluid vision, thus appearing fluid blindness.