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The Artisan lens: effects on vision quality, the corneal endothelium and vision-related quality of life by Saxena, Ruchi is a nonfiction available to read on EtoBox.

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Refractive errors are the most frequent disorders of the eye. In the ideal refractive state, emmetropia, an image is focused directly on the retina, resulting in the perception of a sharp image in a healthy visual system. Such eyes do not require glasses or contact lenses to see sharply. Most eyes, however, have some degree of refractive error, although correction is not always required. In myopia (nearsightedness), the image appears focused anterior to the retina, producing a sharp image at near and a blurred image at distance. A concave lens (minus Diopter) is required to sharpen the image. The reverse is true in hypermetropia (also known as hyperopia or farsightedness), where the image is projected posterior to the retina, producing a blurred image at near and a sharper image at distance. A convex lens (plus Diopter) is required to produce a clear image. Astigmatism (cylindrical error) is the result of two different refractive powers between two perpendicular meridians. A cylindrical correction can correct this problem. Extreme cases of all these refractive errors can cause severe visual loss. Anisometropia is the presence of two significantly different refractive errors. In th

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Author

Saxena, Ruchi

Publisher

The Author] ; Erasmus University [Host

Published

2009

Language

EN

ISBN

9789053351864

Category

nonfiction