This week’s blog on Selecting a pair of Sunglasses has been contributed by Dr Hamed Mofeez Anwar, Consultant Corneal and Refractive Surgeon.
Selecting a pair of sunglasses
Sunglasses may help you look cool and fashionable but they are also designed to protect your eyes, so choosing a pair of sunglasses is about more than just looking good.
1) The lenses
It’s important to protect against excessive exposure to ultraviolet (UV) rays.
Make sure that you check to see if they protect against 99% of UVA rays and at least 95% of UVB rays.
If they are labeled as ‘cosmetic’ or don’t provide any information about UV protection, it’s better not to get them.
Make sure you check for distortion by holding the lenses up to a fluorescent lamp. As you move the sunglasses up and down, check that there is no wave distortion that will also distort your vision. If there is none, this is a good sign.
Finally, make sure that the lenses in the sunglasses are scratch resistant, as scratched sunglasses are damaged and useless.
Note that the colour of the lenses doesn’t just affect your fashion statement, it affects how well you detect contrast and differentiate colours. The colour of the lenses you choose can make a difference to your vision and can enhance contrast, which is always useful, but the colour of the lens can also affect the ability of the eye to detect colour differences, which may be a problem – when driving, for example.
2) The frame
Sunglasses come in all shapes and sizes. Generally, finding a contrast between the shape of your face and the shape of the frame will look good. For example, if you have a round face, more angular frames will work well, and if your face is squarer, a rounder softer frame shape will look good.
Like any pair of glasses, choose sunglasses that fit your face and are comfortable to wear, so take care when trying on new pairs. They should feel well balanced and not squeeze the head, ears or nose, and sit on the bridge of the nose without touching the eyelashes.
The sunglasses should balance on the bridge of the nose and ears; if they feel inclined to one side, you need to adjust them.
Make sure that the lens area is not too small, so that it will be able to block sunlight effectively