Not so many people are endowed with 20/20 vision throughout their lives. Sometimes we need some kind of prescription eyeglasses to help us along the way.
Why would a person need to wear prescription eyeglasses? Here are some of the reasons:
Hyperopia or farsightedness – This is a condition when the eyeball is not deep enough causing the image to focus beyond the eye. People with hyperopia see images far away quite sharply but nearby images look like a blur to them. To correct this problem, the light rays need to come together or converge on the retina. Convex corrective lenses are prescribed for this problem.
Myopia or nearsightedness – Myopia happens when the image focuses in front of the retina. As a result people with this problem only see nearby images clearly while remote images seem to look blurry. Concave lenses are given for this problem since they help bend light rays and causing light from far away images to converge right on the retina.
Presbyopia – This condition occurs when the eye lens becomes inelastic or is no longer able to change shape. Presbyopia often happens around the age of 40 causing farsightedness on those affected. Bifocal lenses are prescribed for this condition. Bifocals posses a second lens placed on the main lens to enable the person to see both far and near images almost simultaneously without any need to shift to different eyeglasses.
Astigmatism – Astigmatism is a commonly occurring eye problem that develops when an irregular curvature of the cornea develops causing blurred vision. The light rays cannot converge or focus on a single point because of the irregular curvature. The first step in correcting this problem is to locate the area of the irregularity that then enables the development of the correct eyeglass lens to help convey light rays passing through that area into proper focus.
When problems like amblyopia, astigmatism, hypo-myopia or myopia occur, it implies that light waves aren’t reaching the back of the eye correctly as it should, causing images to become distorted and blurred. Prescription eyeglasses such as multifocal or single vision glasses, as well as sunglasses created to bend light waves to certain degrees to help them reach the back of the eye properly, help the person wearing them to see images in a clear and proper way.
Whenever you are shopping around for eyeglasses in Seattle, you need to remember that selecting the wrong lenses can seriously affect your overall health and especially the health of your eyes. Eye problems can lead to a plethora of symptoms from headaches to nausea and far more serious problems. So you should not purchase cheap eyeglasses just because you’re on a tight budget. Take a complete eye examination first and afterwards get your updated eyeglasses prescription and consider choices for purchasing high quality discount glasses.