Vision correction refers to one of several methods used to improve blurred vision caused by refractive error
Refractive error, such as nearsightedness or farsightedness, occurs when the shape of the eye is abnormal. The eye is unable to bend (or refract) light properly, so vision is blurred.
The most common methods of vision correction are wearing eyeglasses or contact lenses. They help achieve clear vision by refocusing light rays on the retina, compensating for the shape of the eye.
Refractive surgery is another vision correction option. During refractive surgery, such as LASIK, the eye's focusing ability is adjusted by reshaping the cornea (the front surface of the eye).