How To Choose Sunglasses?
Sunglasses, we are all too familiar with them. Especially in the height of summer, many people like to wear a pair when they go out. The intention is to avoid glare damage to the eyes. But you know what? Sunglasses worn improperly, but more damage to the eyes. Let's learn together.
Most people wear sunglasses to block the ultraviolet rays in sunlight. UV rays can not only cause skin aging and increase the risk of skin cancer, but also do a lot of damage to the eyes. Intense UV exposure may induce cataracts, macular degeneration, pterygium, conjunctivitis, and many other eye problems.
Eye diseases that may be triggered by ultraviolet light
01 Solar ophthalmia is an acute damage to the eye caused by intense sunlight, which is usually caused by the cornea being exposed to ultraviolet radiation.
Generally caused by the cornea by ultraviolet radiation burns, often have severe eye pain, tearing, foreign body sensation, conjunctival congestion, edema, blurred vision and other symptoms.
02 retinopathy ultraviolet light, especially long-wave ultraviolet UVA, will penetrate to the fundus of the eye and cause macular degeneration and other retinopathy, but also increase the chance of macular degeneration, improve the chance of macular degeneration in the elderly.
03 cataract ultraviolet wavelength of 290-400 millimeters, will make the lens soluble protein cross-linking cohesion, so that the lens appears to be aging or opacity, which leads to the appearance of cataracts.
04 Pterygium Ultraviolet light causes degeneration of the conjunctival tissue, resulting in pterygium. Pterygium usually grows from the corner of the eye towards the pupil and will affect vision in later stages.
Because UV rays have such a strong effect on the eyes, it is important to protect your eyes from the sun when UV rays are strong, especially in places with high solar radiation such as low latitudes and high altitudes, but wearing sunglasses for long periods of time is also not good for your eyes.
As the eyes have been in the darker light, the pupils will subconsciously dilate, and in the long run will cause vision degradation. In addition, poor quality sunglasses lens thickness is not uniform, uneven color, poor optical performance will cause damage to the eyes.
How to choose sunglasses?
In the purchase of sunglasses, you can consider from the following convenience: wear light and comfortable, can filter 75% -90% visible light, there is no visual distortion, distortion can block 95% -100% of the UVA (wavelength of 320-400nm ultraviolet) and UVB (280-320nm ultraviolet) lights to see the sunglasses, the edge of the lens will not be twisted, wavy appearing lenses The color is not the darker the better, you can generally pick a medium depth of color, gray, teal, green is more suitable.
Gray lenses can absorb infrared and most of the ultraviolet rays, effectively reduce the light intensity, does not affect the color perception.
Brown lenses have better absorption of blue light, can increase the contrast between the sky and ground objects, so that the vision becomes softer, helpful for people with red weakness, but will deteriorate the vision of people with green weakness.
Green lenses absorb infrared and most ultraviolet rays, but some of the color will be altered, not suitable for people with color weakness.
Yellow lenses can block harmful blue light, see the scene will be more clear, have a high contrast sensitivity, in fast movement can still keep the vision clear, but will affect the night vision and traffic light recognition.
So now you know how to choose？
Thanks for checking
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Sophie Yang
