Sunglasses are a protective shield for your eyes. It protects the eyes from dust, dirt and harmful sun rays. Mostly they are worn because they keep the eyes safe from the adverse effects of the sun. The labels present on the sunglasses often mention that they provide protection from natural radiation as well as the ultraviolet light. You can choose designer sunglasses to make sure that you are buying the best quality glasses.
Keeping the eyes safe from any light that is harmful is critical for healthy eyes. Given below are some of the important features of good sunglasses. Never buy sunglasses that:
1. Cannot Block Majority of the Ultraviolet Rays
Always buy the sunglasses that have the ability to block at least ninety-nine percent of the harmful rays. If the eyes are exposed to the UV rays for a long time. It can cause diseases such as eye cataracts and eye growths. It can also become the cause of cancer. The UVB lights are considered extremely dangerous for the eyes and skin as compared to the UVA radiation.
If you are using plastic or glass lenses, then keep in mind that they absorb some UV light. Manufacturers can improve the absorption of these lights by adding chemicals to the material of lens during the manufacturing. They can also improve the quality by applying special coatings of a lens. To make sure that the sunglass can block the harmful rays, check whether its label says its UV absorption is up to 400nm. This means that they have the ability to absorb hundred percent UV absorption.
2. Not Polished and Ground
The quality of some nonprescription glasses can be improved through polishing and grounding.
To check the quality of sunglasses, you should look for something that has a rectangular pattern. Hold the glasses at a safe distance and close one eye. Move the glass side by side then up and down slowly. If the lines are straight, then the quality of sunglasses is good. If you can see the lines wiggling then, it means that they are not of high quality.
3. Not Resistant to Impact
It is essential for all the sunglasses to fulfill the demands of the Federal Food and Drug Administration. This is an important practice to assess their safety.
All the lens are breakable, but the lens made up of plastic are difficult to break as compared to the glass lens. The nonprescription lens are mostly made up of plastic. In sports, people often use sunglasses which have a lens made up of polycarbonate plastic. It is better to the polycarbonate lens that also has a scratch resistant coating.
4. Not Polarized
Buying polarized lens is an excellent choice because it helps in cutting the glare. Sunlight that reflects from smooth surfaces such as car windows, water, pavement, etc. is harmful. The polarized lens can help in the prevention of any damage because of reflected glare and are very helpful while driving.
There is no connection between this lens and absorption of UV light, but now they are combined with a surface that can block UV light. You should always check the label to make sure that it can provide maximum protection against UV.
5. Not Photochromic
It is a lens that can automatically darken when in bright light and vice versa. They mostly come in a gradient tint or a uniform one.
These lenses are excellent when it comes to the absorption of UV light. You can check the label to make sure that they have the ability to provide perfect protection against harmful rays. They can take some time to adjust to different conditions of light.
6. Gradient v/s Double Gradient Lens
They have a permanent shade from top to the bottom or a shade from the upper and lower that goes towards the middle. A single gradient lens can decrease glare from the sky and allows you to see below clearly. They are not suitable for wearing in snow or at the beach.
Gradient lenses are good for driving as they shield your eyes from overhead sunlight and allow more light through the bottom half of the lens. Double gradient lenses are not suitable for driving because they do not provide a clear view of a dashboard. A double gradient is a good option for wearing during sports where the light reflects off water or snow.
Look for these features while buying sunglasses and your eyes will be safe from any harmful sun rays and they will stay healthy.
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