Short-sighted or myopia effects on vision are usually caused by bad habits we pick up when we are young. Constant reading, writing and concentrating restricts our eyes natural instinct to remain moving and active. When we are forced to learn about information that we find mostly boring it causes our minds to get tired and consequently our eyes feel strained. Staring and straining our eyes are the most damaging things we can do to them and can result in long term ailments such as myopia, astigmatism or presbyopia.