Correction of presbyopia.

Presbyopia, a progressive visual difficulty caused by weakened physiological regulation, is one of the main causes of visual impairment in people over 40 years old. Currently, the main methods of correction of presbyopia include optical correction, surgical correction, and drug treatment, which can improve the visual nearness disorder to some extent. Optical correction is the most common way with advantages of safety, which can adjust the lens parameters at any time, while cause kinds of inconvenience in life by wearing and taking off glasses frequently. Surgical intervention, including corneal surgery, lens surgery and scleral surgery, with certain advantages and disadvantages in each operation style. New pharmaceutical agents are expected to be a new and effective method for the treatment of presbyopia, but it lacks multicenter randomized controlled trials and evidence-based medicine evidence to evaluate the safety and effectiveness.