SOURCE: DAILY MONITOR
WHEN we walk in the sun, we squint and our pupils constrict or become narrower to control the amount of light entering the eyes. This is because of the harmful UVA and UVB rays contained in sunlight. The best way to protect your eyes from these harmful rays is to wear sunglasses.
A good pair of sunglasses should be able to simulate the effect of being in a darkened room so the pupils dilate to allow more light in to allow you see better.
Brian Isiko, an optician affiliated to Reeds Spectacle Centre, Nsambya Hospital, says: “Most sunglasses on the Ugandan market are of poor quality. Many people have fallen victim of vision or eye sight problems unknowingly.”
Most cheap sunglasses won’t have UVA/UVB protection, but do offer some relief from visible light. Your pupils will naturally dilate (become larger) when wearing them, making it feel like your eyes are being protected.
However, despite filtering out the visible light, fake sunglasses still allow UVA and UVB light through. Additionally, the UV rays will enter your dilated pupils at a much higher rate than if you weren’t wearing any sunglasses causing cataract (a medical condition in which the lens of the eye becomes progressively opaque, resulting in blurred vision) and ocular melanoma a rare type of cancer.
Isiko says the first sign that glasses are fake is when they give you a bent and blurred or distorted view of image. Others magnify the objects making them appear as though they are nearer or farther than they actually are. This can be dangerous, for instance, when a pothole in your way seems smaller or bigger than it actually is.
Identiying genuine sunglasses
The basic purpose of sunglasses is to protect our eyes from harmful sun rays. So, before you buy, read the label and find out whether they block 100 per cent of both UVA and UVB rays.