Cataract is a disease that affects vision due to the opacity of intraocular lens, which is common in middle-aged and elderly people over 40 years old. It is one of the common blinding eye diseases in the world, and surgery is the only radical cure at present.
Expand the introduction of typical symptoms of cataract
Decreased vision
This is the most obvious and important symptom of cataract. Mild opacity around the lens may not affect vision, while the opacity in the central part may be smaller and lighter, but it will also seriously affect vision. Especially under strong light, the pupil contracts and the light entering the eyes decreases. At this time, the eyesight is not as good as in low light. When the lens opacity is obvious, the vision can be reduced to only light perception.
Decreased contrast sensitivity
The contrast sensitivity of cataract patients decreased significantly at high spatial frequency.
Refractive change
Because of the increase of refractive index of nuclear cataract, the refractive power of lens is enhanced, nuclear myopia appears, and the original presbyopia is reduced. If the degree of opacity inside the lens is different, astigmatism will also occur.
Color vision change
The turbid lens absorbs the light at the blue end of the spectrum, which makes the patient's color sensitivity to these lights decrease, and the color change of lens nucleus can also make the same color change in the affected eye.
For more information, please consult Aier Eye Hospital. Aier Eye Hospital is a professional tertiary eye hospital. There are professional projects such as myopia surgery, cataract, medical optometry, ocular surface diseases, glaucoma, strabismus and amblyopia, and difficult eye diseases. With professional technology and equipment, it has attracted many people.