Lasik Vision Surgery Procedure | Laser Eye Treatment

Lasik vision surgery is a form of laser eye treatment where a microkeratome is used to create a flap of corneal tissue which is then folded back to enable vision correction by an excimer laser. The cornea varies from around 500 to 600 micrometres in thickness and the flap cut in your eye will be from100 to 200 micrometre thick. You will hear a whirring sound from the high-speed vibration of the blade of the microkeratome and suction pressure is applied to your cornea to tighten the corneal surface and thereby reduce your natural resistance to the equipment.

It takes about two or three minutes of laser treatment for one of your eyes. The laser is computer controlled and the system will track your eye position between 60 to 4,000 times per second redirecting laser pulses for precise placement. There is quite a gap between 60 and 4000 and this is dependent on the quality of the laser used. More modern lasers will automatically center on your visual axis and pause if your eye moves out of range. It then resumes at the precise point where it stopped once your eye is re-centered. The flap is then replaced on your eye. This flap or outer layer of the corneas is a soft rapidly regrowing layer that can completely replace itself within a few days with no loss of vision and so your eye will heal naturally without any stitches.

You will most likely be given anti-inflammatory eye drops, a darkened pair of shields to protect your eyes from bright lights and protective goggles for night time. Following the instructions given will help greatly to reduce the chance of complications.

What Sometimes Goes Wrong

  • Unintentional deep cuts into the cornea.
  • A tear through the center of the flap.
  • The dimensions and thickness of the corneal flap are crucial to success so flaps that are too small or too thin are a problem.
  • Scratches across the surface of the cornea.
  • The severing of the flap hinge increases the risk of flap displacement while it is healing.
  • Some of the above may result in the operation being aborted till the eye heals completely.

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