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near-sighted
or myopia -
The focusing elements of the eye are too strong and light
comes to focus in front of the retina.The eye is "too
long or too strong."
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on the picture to see full size
near-sighted
or myopia
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far-sighted
or hyperopia -
The focus of the eye is too weak and the image of what we
should see is not yet focused when it hits the retina. The
eye is "too weak or too short."
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on the picture to see full size
far-sighted
or hyperopia
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astigmatism
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The eye is not perfectly round and the image of what we
see is twisted or distorted.
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the picture to see full size
astigmatism
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presbyopia
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It is not a shape problem but is an internal aging problem.
The eye muscles cannot change the shape of the lens to focus
on near objects. Near vision declines and reading glasses
or bifocals become necessary.
This occurs with all eyes
- normal vision, myopia, hyperopia, and astigmatism. This
problem begins around 40 years of age or older.
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