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Presbyopia affects most people by the age of
40 and everyone by the age of 51. This is because the aging process
diminishes our natural ability to bring near objects into focus. This
condition manifests when the process diminishes our natural ability
to bring near objects into focus. This condition manifests when the
lens inside the eye lose its flexibility, preventing accurate focus
on objects in the near field of view, such as reading material.
Presbyopia can affect people who are myopic, emmetropic (no refractive
error) and hyperopic. The latter combination is especially problematic
because hyperopes often lose both distance and near vision at the
same time after 40 years of going without glasses or contacts. |
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| With presbyopia, you may experience eye fatigue
when reading in poor light or at the end of the day, trouble changing
focus from distance to near or the need to constantly reposition reading
material to find the right focus. This condition is traditionally
corrected with reading glasses, bifocals or contact lenses. |
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The eye's lens stiffens with age, so
it is less able to focus when you view something up close.
The result is blurred near vision |
Presbyopia is caused by an age-related process.
This is different from astigmatism, nearsightedness and farsightedness,
which are related to the shape of the eyeball and caused by genetic
factors, disease, or trauma. Presbyopia is generally believed to stem
from a gradual loss of flexibility in the natural lens inside your
eye.
These age-related changes occur within the proteins in the lens, making
the lens harder and less elastic with the years. Age-related changes
also take place in the muscle fibers surrounding the lens. With less
elasticity, the eye has a harder time focusing up close. Other, less
popular theories exist as well. |
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