Choosing which corrective eye procedure to undergo is not a decision you should decide in a blink of an eye. The Laser Vision Centre at Singapore National Eye Centre (SNEC) explains the two popular laser corrective eye techniques.
Fed up with the tedious rituals of the severely near-sighted – wearing
contact lenses, treating dry eyes and blind fumbling for glasses at night, Ms Frances Yap decided to go for
However, at the last minute, her doctor called a stop to the procedure. She had developed a condition known as button hole (when the cornea’s curvature is irregular) which would have led to uneven vision after LASIK.
"He made the right decision in not going ahead with the procedure. But I was very disappointed," she said. Ms Yap thought she had to resign herself to a lifetime of glasses and contact lenses.
That was when Ms Yap's husband persuaded her to visit the
SNEC Laser Vision Centre for a consultation.
The SNEC Laser Vision Centre is part of the Singapore National Eye Centre (SNEC), a member of the
SingHealth group. During her consultations with the Laser Vision Centre, Ms Yap, 32, found out about a procedure that could end her bespectacled days. In addition to being suitable for people with conditions such as buttonhole, the procedure was quick, painless and effectively corrects even high degrees of myopia.
Ms Yap went ahead with the procedure and became one of the first Singaporeans to undergo
ReLEx or Refractive Lenticule Extraction.
Difference between LASIK and ReLEx
Unlike LASIK, which uses two lasers and vaporises the corneal tissue to correct vision, ReLEx uses only one laser for the entire procedure. Instead of vaporising the unwanted tissue, the laser used in ReLEx simply cuts out a lens-shaped piece of corneal tissue to correct the
The tissue is extracted either through a regular flap as used in LASIK or through a keyhole incision, depending on the eye. This means more accurate vision correction and less discomfort during and after surgery.
"ReLEx is a natural progression from LASIK. ReLEx performs a very precise cut inside the cornea to laser out a lens-shaped amount of tissue to match the degree. We then remove this lens and the myopia is gone," shared the Laser Vision Centre.
ReLEx delivers excellent results
So far, the procedure (ReLEx) has a 100 per cent success rate. It is also more accurate than LASIK, which is especially beneficial for those with higher degrees of myopia, between 500 and 1,000 degrees.
"This (ReLEx) only takes 30 seconds to perform the correction as the laser is extremely fast and uses very low energy, so there is less discomfort for patients," said the Laser Vision Centre.
SNEC conducted a study of 24 patients who underwent LASIK and ReLEx (one procedure in each eye) and found that more than
75 per cent of them preferred ReLEx, as there is less discomfort during and after surgery.
Another patient who has undergone ReLEx is Ms Gayathri Manokaran, a lab researcher, who opted for this procedure to correct her mild myopia and astigmatism so she could continue to pursue her new hobby – diving.
"I got my diver's license recently, but it's really quite futile if I can't see underwater," said the 31-year-old. "The procedure was so painless, I didn't even realise it was over."
ReLEx also feels more comfortable for the patient because the suction on the eye during the treatment is gentler.
"Patients are also able to see the 'aiming beam' better because of the gentle suction, so there is almost no occurrence of what doctors call 'light blackout' during the treatment as compared to LASIK," commented the Laser Vision Centre.
Light blackout is a phenomenon in which the laser beam the patient is told to focus on during the procedure vanishes when the patient moves his eye. This temporary disappearance of the focal point can cause panic. However, the incidence of light blackout is dramatically reduced in ReLEx procedures.
The benefits of ReLEx are as clear as Ms Yap's newly perfect vision. "I don't have to fumble for glasses when I wake up in the middle of the night to attend to my kids. It's such a relief! You have no idea," she said. "I love to be able to dress up and leave the house without worrying about glasses or contact lenses," added Ms Manokaran.
What will then become of LASIK? As ReLEx becomes more widely used, it may eventually replace conventional LASIK. "Over the years as we adopt new LASIK technology – just like newer mobile phone models – the results get better. And this is where ReLEx comes in – with it, patients now see even better," said the Laser Vision Centre. With wider use, the procedure will also become more affordable.
Read the next page for
more facts on ReLEx and LASIK before deciding which corrective eye procedure is right for you.