Yes, it is possible to lead to cataract because of using too much computer. When we play computer games, we tend to fix our eyes on the screen without blinking, which is liable to lead to loss of water in the eyes and strain the eyes, making them acid and pain. Gradually, one develops myopia, conjunctivitis and even glaucoma after spending too much time on computer. To prevent it, you should ensure that your eyes have enough rest, you should rest for fifteen minutes at least after using computer one hour. And you need to replenish water to your eyes in time, you can drip some eye drops to keep your eyes lasting watery. In addition, you need to supply your eyes with essential vitamin and mineral substances, thus you should eat more fresh vegetables, potatoes, fruits, coarse food grain such as maize, sorghum, millet in the diets.