UV rays can either cause temporary or permanent eye damage like photokeratitis, permanent retina damage, and pingueculae. On the visible light spectrum, the UV rays are located at the violet portion. The UV rays are divided into three types, UVA, UVB, and UVC. UVA comes with longer wavelengths, it has the ability to pass through glass, but the extent of eye damage is not defined. UVB rays are dangerous, sunglasses and sunscreen lotions have to be designed to prevent the penetration of these rays. UVC rays are blocked by the atmosphere and do not enter the earth. Get the perfect protection from UV rays from Hoven Vision. For more information on how to choose a sunglass check http://www.webmd.com/eye-health/features/how-to-pick-good-sunglasses#1.
Many are of the wrong opinion that the sun’s rays affect only when there are out in the sun. UV rays have the ability to penetrate through the clouds, so even during an overcast day, the UV rays can reach the earth. The sun’s rays are at its maximum between 10 am and 2 pm. A sunglass is ideal not just for protection against UV rays, it can also help during driving, while around water, snow or sand.
Risks of UV rays due to medical problems
People with medical conditions like macular degeneration, cataracts, and retinal dystrophies. Sunglasses can protect from eye damage. Contact lenses also come with UV protection. Some of the features to look out for include 400nm or 100% of UV light block. Wraparounds the right solution for complete UV protection.
Different kinds of lenses
Lenses come in varied kinds. Seek the advice of professional optician to pick the right sunglasses. There are different tints can help improve certain conditions. Blue blockers help to block blue light. The lenses are used by hunters, pilots, boaters and skiers.
Polarized lenses come with reflected glare. The lenses are suitable for snow sports and water sports. Mirror coated glasses limits the light entering into your eyes. The glasses come with reflective coatings. Use it on a bright sunny day. Choosing a coating is merely of cosmetic purpose. The color of the glass does not influence the protection. The tinted lens is just for show and has not effect on vision.
Gradient lenses are tinted darker on the top and lighter on the bottom. These are suitable for driving purpose and help in shielding the sunlight and facilitate light through the bottom half. This way the dashboard is visible clearly. Double Gradient lenses are also of the similar type but the top and bottom are shaded darker while the middle is lighter. If you are looking for sunglasses that are not very dark, try gradient glasses. Photochromic lenses are designed to adjust the darkness levels based on the UV light.
Apart from these, there are sunglasses that blocks infrared rays. It is located away from the red part of the light spectrum. The radiation produces heat and there is no danger from the infrared rays of the sun. The color of the lens depends on the personal choice of the user and it does not relate to protection for the eyes. Among the shades, brown and gray are the most popular as it distorts less color.