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Astigmatism:
(Distorted Vision)
In an eye with astigmatism, the front of the cornea is not
equally curved; it is slightly oval in shape, like a football.
Light rays entering the eye bend unequally, resulting in
a distorted image. Astigmatism, which can be treated with
usually occurs in conjunction with myopia or hyperopia.
Symptoms alone can be difficult to detect, but those affected
may notice a subtle difficulty focusing on printed words.
Doctors can identify this condition during a vision exam.
Eyeglasses, contact lenses and refractive surgery can effectively
treat astigmatism. |
Normal Eye |
Astigmatism |
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To treat astigmatism, the cornea can be made more spherical
with the LASIK procedure. By changing the pattern of the
beam, tissue is removed in one direction more than the other.
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Hyperopia: (Farsightedness)
With hyperopia, people may see objects that are far away,
but have difficulty focusing on near objects or may have
to strain the eyes to maintain focus. Hyperopia occurs when
the eyeball is too short or the cornea is too flat, causing
light to be focused behind the retina instead of directly
on the retina for normal vision. |
Farsightedness |
Symptoms
of hyperopia can include eyestrain, blurred vision
or headache (especially when reading or at the end
of the day), and will increase over time if not treated.
Doctors prescribe a "plus" or convex corrective lens
(eyeglasses or contact lenses) for the disorder. Hyperopia
can also be surgically treated by steepening the central
cornea or by flattening the peripheral cornea. |
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Young
people with hyperopia (30 to 45 years) may have fine distance
vision, but might strain their eyes to maintain focus on
close-up objects. Middle-aged hyperopes (45-55 years) may
need glasses for distance especially to drive at night and
may require reading glasses, while older hyperopes (55 years
and up) often cannot see things in the distance or close
up, requiring bifocals.
To treat farsightedness, the central cornea must be made
steeper. This is accomplished with a CK Surgery procedure or with a LASIK procedure by directing the laser beam to
remove tissue from around this area. Both of these procedures
are performed at our offices in Cincinnati and Northern
Kentucky. |
Myopia:
(Nearsightedness)
People with myopia have difficulty seeing objects
in the distance, but may have no problems focusing
on objects that are up close. Myopia occurs when the
eyeball is too long or the cornea is too steep. When
light enters a myopia (long) eyeball it is focused
in front of the retina, instead of directly on the
retina for normal vision. Symptoms of myopia can include
eyestrain, blurred vision or headaches. |
Nearsightedness |
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Doctors
prescribe "negative" or concave corrective lenses (eyeglasses
or contact lenses) for this condition. Surgically, flattening
the central cornea treats myopia.
To treat nearsightedness, the cornea must be made flatter.
This can be accomplished by removing tissue from the center
of the cornea with a procedure such as LASIK. |
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