LASIK Health Education Video (Chinese version only)

LASIK Heath Education Video (Chinese version only)


LASIK is a surgical technique using a cold, concentrated beam of light from an excimer laser to gently reshape the cornea, correcting refractive errors such as short-sightedness, long-sightedness and astigmatism.
First, a corneal flap is created by a microkeratome or intralase and is lifted up. Then, excimer laser is used to reshape the cornea. The flap is then repositioned. Because of the cornea's remarkable, natural bonding qualities, healing is rapid and does not require any stitches. The total outpatient procedure is performed in less than 15 - 20 minutes.


The Laser Correction

The laser is programmed with your unique treatment instructions. The surgeon aligns your eye under the laser and asks you to stare at a red light. The laser's Eyetracker then visually locks on to your pupil. The laser treatment begins and usually lasts for two minutes. During the procedure the Eyetracker ensures that even if your eyes move the tiniest amount, the laser will compensate for this movement and ensure that the treatment of your eye is completely accurate.

Tissue Saving - a faster and more tissue saving treatment of a 2mm scanning spot laser beam is combined with the refinement and accuracy of a 1mm scanning spot laser beam treatment.

Wavefront Technology - A common eye examination and refraction evaluates low order aberrations (LOA). These are commonly called sphere (shortsighted or longsighted) and cylinder (astigmatism). Only a wavefront diagnosis is able to measure high order aberrations (HOA), which are beyond simple sphere and cylinder. HOA includes spherical aberration, coma, trefoil, quatrefoil, etc.

Wavefront technology as a diagnostic device can diagnose and measure aberrations that no other system can even see. It is important to understand that without a wavefront diagnosis, it is impossible for a doctor to accurately determine if wavefront-guided ablation is necessary or not for a good LASIK outcome. In other words, virtually every person considering LASIK should have a wavefront diagnostic evaluation.

Aspheric - Your cornea is naturally aspheric (or elliptical) in shape. It allows us to have better contrast and clarity especially in dim light conditions. In standard LASIK treatment, the shape of your cornea is flattened slightly to correct myopia. Some patients may encounter side effects such as poorer night vision and seeing glares, starbursts and haloes after standard LASIK. Zyoptix Aspheric can better preserve the aspheric shape of your cornea, resulting in better visual performance for patients especially at night.

Iris Recognition - The pattern of a human iris is more unique than fingerprint. The iris recognition technology that originally used for high level security purposes has been adapted for medical use by Technolas Perfect Vision, enabling automatic identification of each eye and making it virtually impossible to treat the wrong patient or the wrong eye.


A Microkeratome is a precision surgical instrument with an oscillating steel blade designed for creating the corneal flap in LASIK. The normal human cornea varies from around 500 to 600 micrometres in thickness; and in the LASIK procedure, the microkeratome creates a 120 to 140 micrometres thick flap.


IntraLASIK is a form of refractive eye surgery similar to LASIK that creates a corneal flap with a femtosecond laser microkeratome (Intralase) rather than with a mechanical microkeratome. The only difference between LASIK and IntraLASIK (also called 'All Laser LASIK') is the method by which the LASIK flap is created. Intralase could create thinner flap than that by microkeratome.


Epi-LASIK (epipolis laser assisted in-situ keratomileusis) uses a plastic blade, called an epithelial separator, to separate the epithelium (cornea's outer layer) from the cornea. Epi-LASIK differs from LASIK in that the flap cut is so thin that it does not penetrate the actual cornea. Other procedures are same as LASIK. Hinged flaps in LASIK procedures serve as a type of natural bandage, when they are replaced over the area of the eye where laser energy is applied to reshape the cornea for vision correction. Therefore, in epi-LASIK, a special contact lens is placed on the eye to keep the flap in place while it re-epithelializes. Surgeons use a high-Dk contact lens for this, which means it is very oxygen-permeable. Without enough oxygen, the surface cells of the cornea would not regenerate.

LASIK Heath Education Video
Photos are for reference only.

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