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ACCUWAVE™
Technology
Like
our fingerprints, each of our eyes is different and has its own
unique shape and visual characteristics. Wavefront Guided Custom
LASIK develops individualised software treatment plans for each
eye. Unlike the standard LASIK procedure which only corrects spectacle/contact
lens achieved refractive errors (myopia, hyperopia and astigmatism),
Wavefront LASIK goes beyond just correcting refractive errors to
actually improving your eye's visual capabilities so you may see
better than you did with glasses or lenses before the procedure.
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Some
visual systems are capable of seeing 20/10 or better, that
is letters twice as small as the 20/20 letters on an eyechart.
Most people cannot see beyond 20/20 because of very subtle
imperfections within their visual system. Using the Wavefront
technology, it is possible to first map these subtle visual
imperfections and then develop a laser treatment plan to correct
them.
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Where older lasers produce a broad, square-shaped beam,
the Allegretto laser has a more rounded, sharply-focused
profile measuring less than 1 mm across. This allows us
to remove the minutest amounts of corneal tissue with greater
accuracy, resulting in a more stable cornea - essential
to sharper vision.
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About
our Wavefront Analyser
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The
key to Wavefront treatment is a device called a Tscherning
Wavefront Analyser. This projects a fine grid of 168 light
beams onto the retina and captures its image using a high
resolution CCD camera. This image is then compared with one
from a normal eye and the difference between the two provides
a "Wavefront Map" which is used to program the laser.
This means we can measure both the extent of poor vision and
its causes with greater precision than has ever been possible
before.
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About
our Eyetracking
System
An optimised eye tracking system detects the positional changes
of the eye and is capable of following and compensating for this
movement in an appropriate time scale to position pulses at the
desired location. The predictability of the refractive outcomes
is affected tremendously by the tracker's accuracy.
Eyetrackers can be active or passive. Passive systems block
the ablation if eye movement exceeds a defined range whereas
with the active eye tracking system used at Phiroze Dastoor,
any eye movement will be followed and compensated for by
the system.
Eyetrackers can also be closed loop or open loop. In a closed
loop system, like the one at Phiroze Dastoor, the eye tracker
uses an active feedback control mechanism for verification
of laser aiming positions before releasing the laser pulses.
A closed loop active eye tracking device is basically state-of-the-art
in eye tracking today.
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