He found (1858) that hypermetropia (farsightedness) is caused by a shortening of the eyeball, so that light rays refracted by the lens of the eye converge behind the retina.
Photorefractive keratectomy (PRK), common surgical method that reshapes the cornea (the transparent membrane covering the front of the eye) to improve vision in patients affected by farsightedness (hyperopia) or nearsightedness (myopia).
A halo can be caused by nearsightedness, farsightedness, cataracts, astigmatism, or presbyopia.
A glare can be caused by nearsightedness, farsightedness, cataracts, astigmatism, or presbyopia.
His pictures of the aftermath — and, later, the effort to rebuild — are colored by his memories and by his unnerving farsightedness.
Any refractive error present (i.e., any defect that prevents light rays from focusing properly on the retina, such as nearsightedness or farsightedness) must be corrected, usually by eyeglasses.
The total prevalences documented in the MONIKA database for severe nearsightedness and severe farsightedness lie only slightly below those of a publication by a German university hospital [ 10].
That comparison is being made at every opportunity by Bush administration officials, who emphasize American generosity and farsightedness.
But such farsightedness is unusual.
An excerpt from "The Keeper of Sheep," a 1914 poem by the Portuguese writer Fernando Pessoa that is recited in the movie, distills the perspective of Mr. de Oliveira, who at the age of 101 should know something about farsightedness.
