To understand short-sightedness, it first helps to understand how the eye works.
Short-sightedness is a refractive error caused by an imperfection in the eye. The imperfection changes the way your eye focuses the light rays that pass into it. This can happen when:
- The eyeball is longer than normal
- The cornea is more curved than normal
If any of these imperfections occur, it changes the eye’s focusing point. This means that light rays focus in front of your retina instead of on it, making objects in the distance look blurry. Close-up objects generally appear clear because the light rays enter your eye at a slight angle, so they focus on your retina properly.
Risk factors for developing myopia are genetic and environmental.
– If your parents are myopic, you have a greater chance of developing myopia.
– Myopia is more likely to develop when you increase near work during critical developmental ages. Spending time outdoors has been found to reduce the development of myopia.