'Nearsightedness, also known as myopia, is a vision problem in which close objects appear clear but distant objects appear blurry. This condition is said to be caused by refractive errors. Refraction is the bending of light as it passes through one object to another.
When light rays are refracted through your eye’s cornea and lens, they become focused on the retina, which then “converts the light-rays into messages that are sent through the optic nerve to the brain. The brain interprets these messages into the images we see,” as stated by the National Eye Institute.'