It is estimated that there are 8.5 million people in the United States who have some degree of color blindness. This is the common name given to the inability to distinguish colors and shades; some people have trouble with only a few colors, others see no colors at all. This inherited disorder affects mostly males: 8 percent of the male population is red-green color deficient, as compared with only one half of 1 percent of the female population. Read the rest of this entry »
Contact lenses float on a layer of tears that covers the cornea and are held in place by surface tension. Soft lenses ride on a thinner layer of tears than hard lenses. The front and back surfaces of contact lenses serve different functions. The back surface is designed to fit the contour of the cornea itself as closely as possible to make the lens fit comfortably and, in the case of a hard lens, to provide a new, round, smooth surface. The front surface is designed to fit your prescription, which corrects your refractive error. How well your eyes are examined and measured, and how closely the contact lenses‘ size, fit, and shape come to these measurements are, therefore, very important factors in how successfully you’ll be wearing your lenses. Everything is done with highly sophisticated and accurate optical instruments, in combination with a contact lens practitioner’s experience and knowledge. Read the rest of this entry »
Contact Lenses Care .
