Cataract is due to the eyes of the internal lens clouding and affect the vision of a disease, most commonly seen in the 40 years of age and older people, is one of the world's most common blinding eye disease, surgery is the only cure at present.
Expanding the typical symptoms of cataract
Loss of vision
This is the most obvious and important symptom of cataract. Mild clouding in the peripheral part of the lens may not affect vision, while clouding in the central part, although it may be less extensive and less severe, can seriously affect vision. Especially in bright light, the pupil constricts and less light enters the eye, so vision is not as good as in low light. When lens clouding is evident, vision can be reduced to light perception only.
Decreased contrast sensitivity
Decreased contrast sensitivity is especially pronounced in cataract patients at high spatial frequencies.
Refractive changes
Nuclear cataracts produce nuclear myopia and a reduction in preexisting presbyopia due to an increase in the nuclear refractive index of the lens and _stronger_ refractive power of the lens. If the degree of clouding within the lens varies, it can also produce lenticular astigmatism.
Changes in color vision
The turbid lens absorbs more light at the blue end of the spectrum, making the patient less sensitive to these lights, and changes in the color of the lens nucleus can cause the same changes in color vision in the affected eye.
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