What does eye refraction mean?

Eye refraction is an optical phenomenon called light deflection, the eye as a medium of light, different parts of the refractive index is different, in the interface between different parts, will show the phenomenon of light deflection, and the severity of this deflection, can be measured through refractive power. If the eye shows refractive error, the light cannot be clearly imaged on the retina after the refractive effect of the eye. This situation is the performance of refractive error. When the refractive error is displayed, it will be manifested as abnormal symptoms of the eye, such as myopia, hyperopia or astigmatism. If these symptoms are manifested due to refractive error, it is necessary to wear glasses in time to prevent further deterioration of symptoms. Laser surgery can also be considered for correction.