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This technology utilises an ultra-violet "excimer" laser of 193 nm to alter the shape of the cornea. This is an argon-fluoride laser with a very high photon energy of 6.5 eV. This cuts off about 0.25 microns per pulse. In the case of myopia (short sight), the cornea is flattened and in hyperopia (long-sight) it is steepened.
How is LASEK Performed?
- A few drops of anaesthetic eye drops are instilled.
- 18-20% ethanol for about 30 sec in a 9mm - 10mm zone marker after a speculum is inserted to keep the lids away from the eye.
- Soak up the alcohol with a spear.
- Make the flap, starting at 6 o'clock, using any suitable instrument. (spear)
- Laser ablation lasts for 15-60 secs depending upon the degree of short sightedness.
- Wash with chilled balanced
salt solution
- Replace the epithelial flap back onto the cornea.
- Instill antibiotic drops.
Or a contact lens is inserted after completion of the procedure in higher degree of short sightedness.
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