eyeglasses  

Mention sun protection, most people think of skin protection, and rarely think of eye protection. Actually, some studies suggest that UV rays are really harmful to eyes and may cause keratitis, cataracts, retinal damage and so on. For that reason, we ought to care our eyes especially in hot summer.
Don't look directly to the sunlight in the hot sunny days.Delicate eyes are easily hurt.One may feel dizzy after looking up to sun for a short while. Long-time direct view will lead to pain, tears, inflammation and blurred vision and so on, thus damage the retina.
As is well known, eye is a delicate tissue that is sensitive to UV rays. It can absorb UV rays with various wavelengths. The ultraviolet radiation with 280nm wavelength does the most damage to the cornea, and it is the cause of conjunctivitis. The 290-400nm wavelength UV ray can cause biggest damage to the lens, which is also the reason for cataract. Studies suggest one is more likely to get cataract if he/she roasts in the sun more. Then what should we do in preventing the harm?
If you stay out in the sun, you'd better make use of hat, umbrella and eyeglasses to protect your eyes from sunlight. It is worth to note that the eyewear you buy should be good enough in quality. Inferior sunglasses will hurt your eyes rather than protecting eyes. They may cause mydriasis. One must buy himself/herself a pair of sunglasses with anti-UV function. Medical study has turned out that it is wrong that the darker the better in terms of lenses. Grey is a preferential choice. People wearing contact lenses can buy UV-protective ones which are able to block 90% ultraviolet radiation. Your eyes will be safer if you add a pair of eyeglass frames.The sun is strongest at noon, which is harmful to both your skin and eyes. You'd better stay at home without going out.

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