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Nearsightedness, or myopia, as it is medically termed, is a vision condition in which people can see close objects clearly, but objects farther away appear blurred. ... Myopia occurs if the eyeball is too long or the cornea (the clear front cover of the eye) is too curved
Myopia, or short-sightedness, occurs when the eyeball is too long so it affects how the cornea and lens focus. This means objects in the distance appear blurry because light rays are focusing at the front of the retina rather than directly on its surface.
What specifically causes the eyeball to grow longer is currently unknown, however we are aware of other factors which can cause myopia. For instance, myopia commonly runs in families so you are more likely to develop it if both sides of your family are short-sighted.
How much time you spend outside and indoors can also affect your eye sight. Spending a disproportionate amount of your time reading, writing, or at a computer can trigger myopia.
Although the contrasts between outdoor and indoor lighting can also increase the degree of myopia during the development stage, so ensuring you have a balance of sunlight and artificial light will help to reduce the strain on your eyes and the degree of myopia.
The eye condition is also more common in some demographics. For instance, myopia is more common in people with Asian roots. Short-sightedness in older people can actually be an early indication of cataracts. Myopia typically develops around puberty, but its onset can be at any age. As myopia is caused by the eye growing longer, it usually becomes worse as a child progresses into adulthood.
Myopia treatment
Nearsightedness can be corrected with eyeglasses, contact lenses or refractive surgery. Depending on the degree of your myopia, you may need to wear your glasses or contact lenses all the time or only when you need very clear distance vision, like when driving, seeing a chalkboard or watching a movies.
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