Laser-assisted in situ keratomileusis means: LASIK (ambulatory stoma procedure) is performed in
An ophthalmology clinic or office. Use of numbing drops is possible. To ensure that the laser does not interfere with your eyes, keep them open. An automated machine is used to create a thin flap around the eyes. After lifting the flap, the laser program reshapes and focuses the inner cornea. It is then repositioned, held in place by the laser. No stitches are required. On average, the laser pulses are between 30-60 seconds. LASIK can be done in 20 minutes for both eyes. It is painless and quick.
(in Medical Dictionary)

What else does Laser-assisted in situ keratomileusis mean?

Laser-assisted, in situ keratomileusis is a type of laser eye surgery that can alter the form of
The cornea can be used to reduce or eliminate the need for contact lenses and glasses in severe cases of myopia.
nearsightedness. This procedure is also known by the acronym LASIK (laser-assisted, in situ keratomileusis).
(in Medical Dictionary)

Prior to LASIK the most popular form of laser eye surgery was PRK. This involved removing the cornea’s surface cells and then reshaping the cornea with the laser. The healing process following PRK can be painful and take several weeks. Both eyes can not be treated simultaneously. Patients must also wait for several months before each treatment to ensure that both eyes heal properly.
(in Medical Dictionary)

LASIK can now be used to correct hyperopia, farsightedness, and astigmatism. LASIK cannot treat long-sight presbyopia caused by age. This is due to the decrease in flexibility that the eyes experience with time.
(in Medical Dictionary)

Pregnancy hormonal changes can affect the shape and density of the corneas and may cause complications in the healing and success of LASIK. It is not recommended that women who are pregnant or planning to get pregnant in the six months following LASIK should have it performed.
(in Medical Dictionary)

After treatment, some people may feel mild discomfort or watering in the eyes. Although this can vary from one person to another, it is often compared to wearing contact lenses too much. There is a real danger of infection with LASIK. After LASIK, no eye patch is required.
(in Medical Dictionary)