People suffering from refractive errors, just read or write when the eye swelling, eye pain, see distant objects is not clear, shall glasses vision correction. Different types of refractive errors with the principle of Ray Ban Outlet sunglasses is not the same, the general should note the following:
(1) Myopia and myopic astigmatism: myopia glasses principle is the smallest degree to achieve the best corrected visual acuity. Such as wearing a diaper (commonly known as 100 degrees) and 1.5 diapers corrected visual acuity of 1.0, should be used as a diaper lens, rather than choose 1.5 diapers. Mild myopia astigmatism (a diaper less) may be given the low degree correction, some patients plus astigmatism lenses, consciously dizziness discomfort, ataxia, may be appropriate to reduce the degree of astigmatism lenses, such as still have this feeling, without circumstances affecting visual acuity (visual acuity of 1.0 or more), you can not have astigmatism lenses, such as wearing a period of time after myopia, astigmatism lenses can be combined to give the eye a process of adaptation. For the first time with high myopia glasses, glasses should be worn low degree, to be adapted to increase the degree and then, in principle, high myopia glasses should be given adequate degree, but not more than 3 diaper increments, astigmatism lenses also give enough. More than 3 diapers and generally can not meet the ordinary glasses (eye refractive error, a difference of more than 3 diapers, two things like sizes, can produce double vision, the brain is not an aggregate), should choose to wear contact lenses (contact lenses). Binocular refraction that much difference (called anisotropic), glasses should best corrected visual acuity in both eyes, which does not produce diplomatic principles.
(2) Hypertrophy and hypertrophy astigmatism: hypertrophy glasses according to the degree of patient acceptance and job requirements in the selection of appropriate lens. For example, a 1.5 diaper refraction and visual acuity of 1.0, the selection of 1.5 diapers as well. High hypertrophy, the patient should be given the maximum acceptable degree lenses. For adults or children under the age of 6, 2 diapers or less mild hypertrophy, without symptoms of visual fatigue, vision can be in the normal range, may not be corrected. Children aged 6 to 15 have hypertrophy or accompanied by Arabic’s, myopically should be fully corrected, and two alternate cover and should promote the myopically eye developmental. Hypertrophy glasses after frequent wearing glasses to emphasize, especially children myopically, insist on wearing glasses are particularly important, and the annual review of optometry 1, timely adjustment of degrees.
(3) Astigmatism glasses principles: general refolding compound myopic or hypertrophy astigmatism, myopia or hypertrophy in accordance with the principles of glasses. For high astigmatism (greater than 3 diapers) or mixed astigmatism, when first worn suited to some (such as dizziness, nausea, etc.), it should be appropriate to reduce the degree, and so after a period of adaptation, according to circumstances giving completely corrected visual acuity improved. For irregular astigmatism patients, ordinary lens is difficult to correct, you can try contact lenses. In short, those who have astigmatism, in principle, should be given full correction, and often wear Cheap Ray Ban Sunglasses, in order to eliminate visual fatigue symptoms.