ASTIGMATISM

Astigmatism is a type of refractive error of the eye. Refractive errors cause blurred vision and are the most common reason why a person goes to see an eye professional.

FARSIGHTEDNESS

Alternative Names: Hyperopia

Farsightedness is greater difficulty seeing near objects than distant objects.

NEARSIGHTEDNESS

Alternative Names: Myopia; Shortsightedness

Nearsightedness is when light entering the eye is focused incorrectly, making distant objects appear blurred. Nearsightedness is a type of refractive error of the eye.

PRESBYOPIA

Presbyopia is not an error, but rather, an age-related loss of the focusing power for near. It usually sets in as one approaches the age of 40 or thereabouts. Normal and farsighted individuals usually require reading glasses once they reach this age.