Farsightedness

 

Eyeglasses:

Convex lenses are needed to correct this condition

 Contact Lenses:

A farsighted-correcting contact lens is the opposite, thicker in the center than in the periphery.

 Laser:

For hyperopia correction, more sculpting is preformed in the periphery than in the center. This results in the removal of a concave-lens-shaped portion of tissue, which is optically equivalent to adding a convex lens to the eye’s optical scheme. 

Farsightedness (hyperopia) is the optical opposite of nearsightedness. In a farsighted eye, light would focus behind the retina, so when it does meet the retina a blurry image is perceived. Farsightedness affects about 10% of the adult population.

Farsightedness correction by laser involves sculpting so as to steepen central corneal curvature. Glasses and contacts correct this by adding a convex lens to the optical system, whereas laser treatment works by evaporating or subtracting a concave lens-shape from the cornea.