Why Can’t I See Well?

The cornea, which covers the front of the eye, bends light rays so they focus directly on the retina, a thin membrane at the back of the eye. The retina sends those images to the brain through the optic nerve, producing eyesight.

Myopia
If the cornea is too steep, light focuses in front of the retina, causing nearsightedness. Nearsighted people usually see well up close without corrective lenses.

Hyperopia
If the cornea is too flat, light focuses behind the retina, causing farsightedness. People who are farsighted usually see well at a distance but need glasses or contacts t see well up close.

Astigmatism
Astigmatism results form a cornea with an oval or irregular surface. This results in multiple focus points within the eye. Many people have astigmatism in addition to nearsightedness or farsightedness.