Prescription sunglasses’ lenses contain powers to help the users see clearly. The purpose of wearing sunglasses is to protect your eyes from the ultraviolet radiation. The ultraviolet radiation can cause harm if your eyes are exposed to the sun for a long period of time. It can cause you to suffer from various kinds of diseases including ultraviolet keratitis, cataracts, eye cancer and etc. To protect your eyes, you should wear sunglasses because it contains a dark layer to obstruct the sun from shining directly on the retina. Too much exposures to the sun can cause your eyes to become teary. You can become blind if you keep on exposing your eyes to the sun.
When shopping for prescription sunglasses, you must make sure that it offers ultraviolet protection. You can ask the optometrist to check whether the lenses offer protection from ultraviolet ray. The optometrist has a specific equipment to check whether the lenses are equipped with ultraviolet protections. Before buying, you can seek the advice of your optometrist. The tints of the lenses must be uniform. If the tints on the lenses are not uniform, you should not buy it. If you are buying gradient sunglasses, you will observe that the tints become lightened progressively. If you want to wear the sunglasses while driving, make sure that it is gray in color. The lenses must be free from distortion. To find out if it is distortion free, you can hold the lens at the length of your arm. After that, you can look at a straight line and move across the line. If it distorts, it means that it has imperfection.
It is recommended that you buy a prescription sunglasses that can block 99% of the ultraviolet A and ultraviolet B radiations. It should be able to filter out 75% – 90% of the light. There are various types of sunglasses lenses including polarized, photochromic, and polycarbonate lenses. Polarized lenses prevent the sunlight glare from reflecting in your eyes. It is not suitable for people who want to wear them while playing golf because it can reduce the performance. Photochromic lenses can automatically darkened or lightened depending on how much light is present. When you are in a bright place, it will automatically darkens. When you are in a dark place, it will return to the original state. Polycarbonate lenses are suitable for people who want to wear the sunglasses while performing sports activities.