Lasik & Supervision ( Cont...)
How
Lasik works
- Laser eye surgery works by pulsing a tightly-focused beam of light
(laser) onto the surface of the eye.
- Upon contact with the surface of the cornea, the laser vaporizes
a microscopic portion of the cornea.
- By controlling the size, position and number of laser pulses, the surgeon can precisely control the amount of cornea removed.
- LASIK uses a microkeratome,hansatome to create a "flap"
of the outer corneal tissue that can be folded out of the way and
then replaced.
- Once the flap is folded out of the way, LASIK uses the cold Excimer laser to reshape the underlying corneal tissue.
- Then the flap is replaced over the reshaped area and conforms to
the new shape
Healing
The advantage at our center is that we use a " Hansatome"
to create a flap that gets attached to the corneal bed in the upper
portion of the cornea and this helps actually in quick healing, with
better adherence .
As soon as that flap is replaced, it begins to naturally seal itself
to the rest of the cornea.
This approach greatly speedens the overall healing process when compared
to PRK, which leaves the reshaped area open.
Safety of Lasik
- The Excimer laser is a cold laser, which means that it does not heat up the surrounding air or surfaces. Instead, a very tightly-focused beam of ultraviolet light is emitted.
- The ultraviolet light is absorbed by the upper layer of the surface
that it contacts.
- The ultraviolet beam of light only penetrates a microscopic amount,
less than a nanometer (a billionth of a meter), into the surface of
the cornea.
- The heat created from the energy released by the laser is dissipated
along with this microscopic layer of the cornea.
- The Excimer laser is incredibly precise. It has the ability to focus
a beam as small as 0.25 microns. Considering that a typical human
hair is 50 microns in diameter, that means that the Excimer laser
is capable of removing 0.5 percent of a human hair's width at a time!
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