Speaking of sun protection in summer, everyone would pay attention to their skin, few remember eyes. Instead, surveys show that ultraviolet radiation is the main cause of some eye diseases, such as keratitis, cataracts, retinal damage. 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.Eyes are extremely weak. Short-term direct view to sunlight will result in an immediate shadow in eyes.Direct view to sun for a long time may bring about damage to eye and retina, accompanied with pain, tears, inflammation and blurred vision.
As is known to all, eyes are fragile and susceptible to ultraviolet radiation which would easily injury eyes. The 280nm ultraviolet radiation does maximum damage to the cornea and seems to cause conjunctivitis. The UV ray of 290-400nm wavelength damages the lens badly, which is also the pathogenic factor of cataract.Studies suggest one is more likely to get cataract if he/she roasts in the sun more. Well then, I'd like to tell you some preventive measures.
If you stay out in the sun, you'd better make use of hat, umbrella and bifocal eyeglasses to protect your eyes from sunlight. It is worth to note that the progressive glasses you buy should be good enough in quality. Poor sunglasses are not helpful in protecting your eyes; instead, they may cause a lot of problems to eyes. One must buy himself/herself a pair of sunglasses with anti-UV function. Medical research shows that it is unnecessary to choose lenses with too dark color. Grey and light grey are more effective in blocking UV rays. If you wear contact lenses, you can choose those with anti-UV function which can block 90% ultraviolet rays.It would be safer to add a pair of progressive eyeglasses. It's best to avoiding going out at noon when the sun is very strong and much harmful to our skin and eyes.