1.Don't smoke. The many dangers ofsmoking have been well documented. When it comes to eye health, people who smoke are at greater risk of developing age-related macular degeneration, cataracts, uveitis and other eye problems. 2.Exercise more frequently. According to the AAO, some studies suggest that regular exercise — such as walking — can reduce the risk of age-related macular degeneration by up to 70 percent. 3.Protect your eyes from harmful UV light. When outdoors during daytime, always wear sunglasses that shield your eyes from 100 percent of the sun's harmful ultraviolet rays. This may help reduce your risk of cataracts, pingueculaand other eye problems. 4.Eat a healthy and balanced diet.Numerous studies have shown thatantioxidants can possibly reduce the risk of cataracts. These antioxidants are obtained from eating a diet containing plentiful amounts of fruits and colorful or dark green vegetables. Studies also have shown that eating fish rich in omega-3 fatty acids may reduce your risk of developing macular degeneration. Also, consider supplementing your diet with eye vitamins to make sure you are getting adequate amounts of the nutrients you need to keep your eyes healthy. 5.Look for warning signs of changes in your vision. If you start noticing changes in your vision, see your eye doctor immediately. Some trouble signs to look for are double vision, hazy vision and difficulty seeing in low light conditions. Other signs and symptoms of potentially serious eye problems that warrant immediate attention include red eyes, frequent flashes of light, floaters, and eye pain and swelling.
1. The main cause of eye damage is that using tabs,phone,computer,laptops,etc for long time , because seeing a particlar concentrated object which emits light can damage retina inside the eyes which leads to sight. 
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1.Cause i forgot and wrote in the comment box
2.Direct contact of smoke i.e, charcoal smoke,cigeratte, etc which damages the cornea and leads in formation of puss in eyes
3.Sometimes without your involment your eyes can be effected by bacteria or microorganisms.

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