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Refractive Errors
REFRACTIVE ERRORS -
PATIENT INFORMATION

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Refractive Errors Surgical Treatment
Surgical treatment: It is recommended after the age of 18 years. The eye number has to be stable for at least 6 months. The various surgeries that can be performed are:

        Radial keratotomy(RK) Radial keratotomy (RK): It decreases myopia by flattening the cornea             by making multiple radial incisions of varying depth. The following             complications may occur:

           • Accidental corneal perforation
           • Vision threatening complications like infection
           • Rupture of eye globe by trauma due to weakened scar
           • Overcorrection
           • Undercorrection
           • Unstable vision.

        Astigmatic keratotomy Astigmatic keratotomy: It is similar to RK and is used in treatment of             cases of astigmatism. Here only one meridian/axis is cut to make a more             curved axis flatter.

        PRK PRK: PRK with Excimer laser involves the reshaping of the outer surface of             the cornea. The range of correction is from -1.0 to - 6.0 D and +1.0 to             +4.0 D. The disadvantage is that it has a longer visual recovery period.

        LASIK LASIK: This is the latest and the safest procedure.

  Principle: A thin layer of cornea is cut like a flap with a precise   cutting instrument. This clear flap is lifted up and folded upon to   the top eye. Excimer laser is applied over the internal part of the   cornea to reshape it and the flap is placed back in its original   position where it heals into place with no stitches.


Range of correction :- -1.0 to -18.0 D and +1.0 to +8.0D. It corrects astigmatism upto +/- 4.0 D. Its advantage is that visual recovery is very rapid. Within one or two days most patients see clearly.


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Last updated on 12-07-2001
Eye Care for Growing Children
In growing children, parents should take certain care like:
Eye Care for Growing Children
Eye Care for Growing Children
Child should not sit close to TV.
Eye Care for Growing Children
Child should not hold books close to the eyes.
Eye Care for Growing Children
Avoid exposure to sharp instruments.
Eye Care for Growing Children
Eye Care for Growing Children
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