LASIK
>LASIK
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Direct telephone 040 5551 0366
Ms Sheetal 93463 19982/040 3061 2131
Shaik Yousuf Arfath 040 3061 2101
Email: lasik@lvpei.org
Fax: 040 2354 8339 |
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LASIK
Surgery
LASIK (or Laser-Assisted In-Situ Keratomileusis) is the most
modern surgical procedure for correcting vision problems like
myopia, hyperopia, and astigmatism. This is an advanced laser
vision correction technique in which the curvature of the
cornea is reshaped using a laser that is capable of removing
tissues with precision up to a micron level. For this procedure
patients should be at least 18 years of age and the refraction
(spectacles power) should be stable (unchanged) for at least
a year. Persons who typically opt for LASIK are those who
find spectacles visually unacceptable, those who are intolerant
to lenses, those who would like to participate in outdoor
sports or opt for professions demanding excellent uncorrected
vision.
However, though doctors strive
to make the refractive error zero after LASIK, this may not
always be possible. The main purpose of surgery is to offer
sufficient good vision to patients so that they are not dependent
upon glasses most of the time. Some of the possible side effects
of LASIK are undercorrection, overcorrection, glare, halos,
and reduced contrast sensitivity. Therefore patients must
have a detailed eye examination before surgery, followed by
a realistic discussion with the surgeon on the expected outcome
of surgery.
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Wavefront
Assisted Customised LASIK
Wavefront assisted customized LASIK is an exciting new laser
vision correction method where not only are refractive errors
corrected but a spot laser also removes tiny aberrations in
the eye. reducing night vision problems and improving the
quality of vision. In the hands of skilled surgeons this technique
can help improve the outcome of LASIK. This cutting edge technology
has been borrowed from astronomers, wherein an instrument
called the aberrometer (Zywave) measures minute imperfections
in the eye, so that they can be corrected during LASIK surgery.
The procedure minimizes the likelihood of new aberrations
occurring, which could reduce the quality of vision and make
people prone to night vision problems like haloes, glare and
ghost images.
With older lasers, only the
spherical and cylindrical power could be corrected. Since
an aberrometer can measure many different types of aberrations,
in addition to the sphere and cylinder, surgeons can use it
to correct many more aberrations. This extra measurement has
inspired surgeons to go towards 20/10 vision. Even if the
acuity is not pushed to 20/10, there is the benefit of increasing
the contrast or the difference between the lighter and darker
parts of anything that is perceived. This can be especially
important at night, when the aberrations are particularly
severe because the pupil is larger.
The Zyoptix procedure leads
to more accurate vision correction, better night vision, greater
predictability of the surgical outcome, reduced glare, enhanced
contrast sensitivity, greater safety and efficacy.
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Defects
or aberrations that can be corrected with LASIK
Myopia or shortsightedness occurs when light rays are focused
in front of the retina causing blurred vision, particularly
when viewing distant objects. Objects that are near may be
seen clearly, but not those that are far away. Myopia is often
hereditary, usually due to an abnormally large eyeball or
steeply curved cornea. Because the eyeball grows with age,
myopia tends to progress, usually stabilizing by the time
the person is 20 years old.
Hyperopia or farsightedness
is the opposite condition of myopia, where the light rays
converge at a point beyond the retina. Initially objects that
are near seem blurred, though the distant vision is clear.
However, with age, objects at all distances become blurred.
Astigmatism is an irregularity
in the shape of the normally spherical cornea. The cornea
is shaped like an egg or the back of a spoon, causing distortion
of both distance and near vision.
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