Presbyopia

Presbyopia, presbyopia in western medicine, presbyopia in English. . Most people start around the age of 40-50 years old, and have problems with normal distance vision and difficulty in working at close distances, such as reading. This weakened physiological regulation due to aging is called presbyopia. In 1855, H.Von Helmholtz proposed that with age, the lens gradually hardened, the elasticity weakened, and the function of the ciliary muscles gradually decreased, which led to the gradual decline of the eye's regulatory function, which caused near-distance work such as reading. Presbyopia is mainly manifested as nearsightedness, reading requires stronger illumination, and nearsightedness cannot be sustained, and some patients even have symptoms such as eye swelling, tearing, headache, and other visual fatigue. The main treatments are contact lenses (contact lenses), frame lenses, and surgery. Presbyopia is a physiological phenomenon that occurs regardless of the refractive state.

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