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Standard LASIK
Standard LASIK is based solely on subjective refraction - a determination
of the refractive error based on patient feedback.
The ophthalmologist accurately determines the patient's refractive error
by using a device called a Phoropter to present corrective lenses to the
patient. The patent looks through a series of lenses placed in the Phoropter
to read an eye chart. The ophthalmologist changes lenses until the patient
determines which lens provides optimal vision. The results of this exam,
the lens prescription, are programmed into the laser equipment, so that
these values are corrected on the cornea.
This standard method is the most commonly used LASIK procedure worldwide,
because it can be performed with almost any laser.
This procedure is suitable for the correction of regular spherical corrections,
but even a simple, regular astigmatism cannot be corrected to more than
70% optimization. International publications have shown that when using
older lasers, without an active eye tracking system, correction results
are even worse.
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