subject: Prescription Glasses: Correct Various Refractive Errors Of The Eye [print this page] Prescription sunglasses are meant for correcting vision. They are used for correcting various refractive errors of eyes such as myopia, hyperopia and presbyopia. These glasses are easily available online. People can buy them from online optical stores which make them available at reasonable prices.
Prescription sunglasses have a great demand among people. This is because today, many people suffer from refractive errors of the eye. These glasses are used to modify the focal length of the lens to correct different vision disorders. Here are mentioned some of the disorders of the eyes which are common these days.
Myopia (Nearsightedness): It is a defect of the eye in which the vision is blurred in seeing the far away objects clearly while the close objects can be seen without any difficulty. This refractive error of the eyes gives blurred vision to distant objects. The light focuses in front of retina instead falling directly on it, thus the image is focused in front of the retina .It results from a curvature of the cornea which is not similar to the angle of refraction which is desired, causing nearsightedness.
Hyperopia (Farsightedness): This refractive error of the eyes is also called farsightedness or Hypermetropia. In this refractive error of the eye, a person can see far away objects clearly and there is difficulty in seeing the nearby objects clearly. It occurs because of the eyeball being short from front to back and the image is focused behind the retina. It is a defect of the eye in which light is focused behind the retina instead of focusing it on the retina itself. An individual suffering from this defect can see the far away objects clearly and the vision is blurred while seeing the near objects.
Presbyopia: This refractive error in the eye is caused when the eye's crystalline lens loses the required elasticity. This further reduces the capability of the lens to focus on objects which are placed close to the eyes. This error occurs mainly after the age of 45 and is usually classified as a middle age problem and the person affected by it faces difficulty in reading and needs corrective lenses.
To correct all these defect in the eyes, prescription sunglasses are needed. These glasses are available on line today. They are more convenient to buy from as compared to the traditional optical stores. People can easily order for their prescribed glasses from the comforts of their homes. People can also get huge discounts on them as the process of online dealings is streamlined in such a way that the consumers can get cheap glasses from online. Great emphasis is laid on the quality and high quality products are made available to the consumers.
