LASER VISION CORRECTION

Laser vision correction

Here at Atlas Eye Specialist Centre, we adopt the US FDA-approved ZEISS technology to provide all 3 generations of laser vision correction (ReLEx® SMILE/LASIK/PRK) to correct myopia, hyperopia and astigmatism. We recognise that not everyone’s eyes are the same and we aim to find a treatment most suited to your lifestyle and visual needs.

The type of treatment you go for is dependent on the shape of your eyes, corneal thickness and the amount of myopia and/or astigmatism you may have.

ReLEx® SMILE

SMall Incision Lenticule Extraction (ReLEx® SMILE) is a minimally invasive procedure which combines the qualities of both PRK and LASIK – flapless and fast recovery. A flapless procedure where the corneal structure is left largely intact, SMILE is ideal for individuals who have active lifestyles/occupations with a risk of trauma to the head or eyes and/or for those predisposed to chronic dry eye. The single-step procedure takes only 24 seconds and patients need not change their position unlike LASIK that require 2 different lasers:

  • A femtosecond laser creates a disc-shaped piece of corneal tissue (lenticule) just beneath the surface of the cornea.
  • The same laser then creates a small incision of 4mm in the cornea, from which the lenticule is removed, resulting in a reshaped cornea that corrects the vision.

Wavefront bladeless LASIK

Laser-Assisted In Situ Keratomileusis (LASIK) is a flap surgery. A thin 22mm flap is created with a rapid and highly precise femtosecond laser. The flap is then gently folded back to expose the corneal surface for an excimer laser to reshape the cornea for vision correction. Visual recovery is quick and it is rare for patients to experience flap-related effects. LASIK is the most widely performed laser vision correction procedure since its introduction in the early 1990s. LASIK improves upon PRK in the areas of discomfort and recovery time, but may come with a higher possibility of dry eye. Here is the procedure:

  • A femtosecond laser creates a 22mm flap which can be folded back temporarily.
  • An excimer laser guided by Wavefront technology (maps your eye in 3 dimensions giving a precise reading for the laser to customise the treatment) sculpts the corneal tissue over a few seconds to correct the refractive errors.
  • The corneal flap is repositioned and will stay in place until it is fully healed.

Advanced surface ablation
(Wavefront PRK)

PhotoRefractive Keratectomy (PRK) is a ‘no-flap no incision’ procedure based on surface ablation. The visual correction is made directly on the cornea surface after the thin outer layer of the cornea (epithelium) is removed. Visual recovery following PRK treatment generally takes longer and can be accompanied by some discomfort. PRK offers distinct advantages for patients with lower prescription and slightly thinner corneas. Other procedures that fall under the category of advanced surface ablation include epi-LASIK, LASEK and TransPRKWavefront PRK comprises 3 main steps:

  • The epithelium on the surface of the cornea is dissolved by a diluted alcohol solution and then removed by an instrument.
  • An excimer laser guided by Wavefront technology (maps your eye in 3 dimensions giving a precise reading for the laser to customise the treatment) sculpts the corneal tissue over a few seconds to correct the refractive errors.
  • A protective contact lens is placed over the eye until the epithelium grows back within a few days.

Collagen cross-linking (CXL) (Xtra)

Incorporating collagen cross-linking (CXL) into laser vision correction procedures activates the cornea’s collagen fibres to cross-link and thereby strengthening the cornea. For patients with slightly thinner corneas and higher prescription of astigmatism, CXL may extend the longevity of the laser procedure and can minimise the need for enhancement, lessening the risk of long-term changes to your vision. The following procedure is applied after the removal of the lenticule (in ReLEx® SMILE) or reshaping of the cornea (in LASIK and PRK):

  • Riboflavin eye drops are dropped onto the cornea.
  • The eye drops are allowed to soak for 1 minute after which the cornea is rinsed clean and its flap (if any) is restored.
  • Ultraviolet light is then directed on the eye for 1 minute binding the chemicals between the collagen molecules.