Nearsightedness (Myopia) - Cause
nearsightedness (myopia) is caused by a natural change
in the shape of the eyeball. This causes light to focus
in front of the retina rather than directly on the
retina. Nearsightedness is usually inherited. A child
is likely to be nearsighted if one or both parents are nearsighted.
See more information about
eye anatomy and function.
think that too much close work, such as reading or sitting
too close to the computer, causes nearsightedness.
Some studies suggest that people who
do large amounts of reading have
higher degrees of nearsightedness.
than the natural change in the shape of the eyeball, there are a few rare
causes of nearsightedness. These are:
Pathological myopia, in which the back
of the eyeball continues to grow longer after reaching normal adult
- Secondary myopia, which may develop as a result of many
premature birth and a number of eye
Pseudomyopia, or sudden nearsightedness that rapidly
gets worse because of another illness, such as uncontrolled
In some cases, nearsightedness may be caused by eye
problems such as
keratoconus. Premature birth may increase the
likelihood that a baby or young child may become nearsighted, especially if the
retinopathy of prematurity (ROP).
who are very nearsighted (severely myopic) have an increased risk of
retinal detachment. Retinal detachment happens because
the retina may be stretched if you have severe myopia.