LASIK surgery. What are its steps?
For the safe and effective correction of errors of refraction, careful examination and decision making for the type of surgery is important. In under 10 minutes, LASIK surgery can correct most cases of myopia, astigmatism and other errors, and can rid you of your glasses, but does LASIK suit everyone? !
What is LASIK?
This procedure is a sophisticated type of vision correction using surface ablative laser, which depends on the removal of a superficial layer (flap) of the cornea of 110 to 150 microns using a highly specialized surgical blade known as (microkeratome) so that the excimer laser can reshape the cornea to repair myopia, myopia and astigmatism.
How does it work?
- The doctor instills local anesthetic eyedrops to the so that you are awake but cannot feel pain
• a special instrument is used to open the eyelids, then a small ring is placed around the cornea of the eye.
• a highly accurate and specialized blade lifts a flap of the corneal layers and the doctor asks you to Looking at a bright blinking red light
• The laser is then activated and reshapes the cornea in a few minutes
• The corneal flap is replaced to its original position and that layer heals within 24 to 48 hours without stitches
Certain antibiotics and other eyedrops are prescribed by your doctor
• full recovery takes about 3 months .
What are the indications for LASIK and who are the candidates?
- Age is appropriate: you must be at least 18years.
- Stability of vision: your eyeglasses prescription should be stable at least two to three years.
- Corneal stability: There should be no history of previous or corneal disease such as previous corneal ulcers, keratoconus, or other as diabetic retinopathy, macular degeneration, glaucoma.
- Pregnant and nursing women are not candidates for LASIK .
What tests are required before lasik?
- Measuring the thickness of thecornea.
- Measuring intraocular pressure.
- Examination of the eye and the posterior segment and retina.
- Surface mapping topography of the cornea using a Pentacam .
When does vision fully recover after lasik?
In the first hours, you will feel a slight blurring of vision and you should arrange to have a ride back home on the day of the operation.
During the first two weeks, light halos are felt around the lights at night, but they do not hinder driving and gradually disappear within one to two weeks.
Full recovery usually occurs after six months, following the doctor’s instructions and the eyedrops prescribed are very important to the healing process and maximizing the visual benefit.
What is the important post-operative instructions?
- Avoid eye rubbing
- Avoid swimming pools, saunas, steam rooms, Jacuzzis and hot tubs
- Avoid contact sports
- Avoid make up for a week
What are the some of the expected side effects I should be prepared for after the operation?
- Itching or eye irritation
- Blurry vision, which is usually limited to the early hours after the Lasik operation, but disappears after a few hours.
- halos around the light may appear but disappear after the corneal healing is complete.
- Sensitivity to light may occur but disappears within hours and be avoided by wearing sunglasses.
Can the operation be re-done if the results are unsatisfactory?
In the event of a decreased vision or failure to correct the full error for some cases LASIK can be done but after fulfilling certain criteria . a thorough clinical examination to measure the thickness of the cornea, and reimaging of the cornea should be done . also, the choice of Lasik surgery might be changed using custom LASIK or femto LASIK, which give better results and helps to modify the surface of the cornea with higher accuracy, which reduces visual distortions
Can LASIK be done for patients with cataract and glaucoma?
For a cataract patient, Lasik can be performed after removing the opacity and implanting an intraocular lens to treat the remaining error of refraction. As a rule, Lasik cannot be performed in patients with cataract.
As for the patient of glaucoma, your doctor will need to first follow up the eye for a specified period to check the level intraocular pressure, and its stability, and ensure the health and condition of the optic nerve and the that the level of visual acuity and visual field is suitable for LASIK. After the surgery, the eye must be followed up routinely