Refractive Error

Satisfactory Essays
According to a study of 14213 participants, estimated half of the US population 20 years and older has some type of clinically important refractive error and the annual direct cost of providing refractive correction to the 100 million people who need it to achieve good vision as exceeding $3.5 billion (not including the costs of identifying those who need refractive correction). Besides its high prevalence, refractive errors also cause essential problems to the patient’s daily activities, such as driving, reading, and writing. Currently, the treatments are wearing eyeglasses or contact lenses and refractive surgery. Although lenses treatment is inexpensive and convenient, it brings discomfort to the patient, such as suppressing nasal blood
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