What are refractive errors?
For our eyes to be able to see, light rays must be bent or "refracted" so they can focus on the retina, the nerve layer that lines the back of the eye. The cornea and the lens refract light rays. The retina receives the picture formed by these light rays and sends the image to the brain through the optic nerve.
A refractive error means that the shape of your eye doesn't refract the light properly, so that the image you see is blurred.
While refractive errors are called eye disorders, they are not diseases.
What are the different types of refractive errors?