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MyHEALTH
JOURNEY TO BETTER HEALTH
OPHTHALMOLOGY
LASIK (Laser in-situ Keratomileusis)
is a laser eye surgery technique
that reshapes the surface of the eye
(cornea) to correct nearsightedness, far-
sightedness and astigmatism.
LASIK surgery is performed on individ-
uals suering from myopia (short-sight-
ed), hypermetropia (longsighted),
astigmatism (unevenly curved cornea),
and oers them freedom from glasses
and contact lenses. LASIK is a great op-
tion for many individuals considering
laser vision correction for a variety of
very personal and professional reasons.
We have invested in the only 100%
bladeless refractive laser technology
in Mauritius thus benetting patients
who wear glasses. The Alcon Wavelight
Refractive Suite performs blade-free
LASIK (Laser Eye Surgery), which is safer
and more advantageous than the con-
ventional Lasik surgery.
The basis for successful Lasik treatment
is an accurate diagnosis. We oer high
precision diagnosis with the one and
only Allegro Oculyzer on the island.
The benets of this industry leading
equipment are advanced safety and in-
creased comfort due to the high speed
eye tracking precision of the laser ensur-
ing reduced chances of corneal ectasia
and lower risk of infections. The Refrac-
tive Technology oers our patients best
outcomes with quicker recovery times.
What are the advantages of Blade
Free Lasik and how safe is it?
Femtosecond LASIK / BLADE FREE LASIK
is generally safe, eective, and has very
few side eects. It is a highly successful
procedure that can at the very least re-
duce a person’s dependence on glasses
or contact lenses. The lifestyle benets
can be tremendous for active and social
people. These benets can enable peo-
ple to more freely pursue their hobbies,
sports activities or career options.
How is the procedure carried out?
LASIK combines the accuracy of the
Femtosecond laser to cut a ap in the
cornea along with excimer laser to re-
shape the cornea.
Femtosecond assisted LASIK :
In usual LASIK surgery, a surgical instru-
ment called a microkeratome is used to
create a ap of the corneal tissue. A mi-
crokeratome is a tool with a blade that
cuts a circular ap of tissue from the sur-
face of the cornea. This thin ap of cor-
neal tissue, attached by a hinge, is fold-
ed back exposing the inner layer of the
cornea (stroma). Next, the excimer laser
is used to reshape the cornea (stroma).
After the inner tissue of the corneal is re-
shaped, the ap is repositioned, without
the need for stitches. In Blade Free LASIK
/ Femtosecond LASIK, femtosecond la-
ser is used to cut a ap of the corneal
tissue (usually with a thickness of 100-
120 microns). Femtosecond (FS) laser
is an infrared laser with a wavelength
of 1053nm. It works by producing pho-
to disruption or photoionization of the
optically transparent tissue such as the
cornea. Application of Femtosecond La-
ser results in the generation of a rapidly
expanding cloud of free electrons and
ionized molecules. The acoustic shock
wave so generated results in disruption
of the treated tissue.
What about LASIK ap creation with
femtosecond laser ?
A suction ring is centered over the cor-
nea and suction is applied. The docking
procedure is then initiated while keep-
ing the suction ring parallel to the eye.
An applanating contact lens is used to
stabilize the globe and to atten the
cornea .The surgeon administers the FS
laser treatment. Each pulse of the laser
generates free electrons and ionized
molecules leading to formation of microscopic gas bubbles dissipating into surrounding tissue. Multiple pulses are applied
next to each other to create a cleavage plane and ultimately the LASIK ap. Suction is then released. A spatula is carefully
passed across the ap starting at the hinge and sweeping inferiorly to lift the ap for excimer laser ablation
What are the major advantages of FS laser?
1. Reduced incidence of ap complications like buttonholes, free caps, irregular cuts etc.
2. Greater surgeon choice and control over ap diameter and thickness, side cut angle, hinge position and length.
3. Increased precision with improved ap safety and better thickness predictability.
4. Capability of cutting thinner aps to accommodate thin corneas and high refractive errors.
5. Other advantages over microkeratome assisted LASIK include stronger ap adherence, better contrast sensitivity, decreased
incidence of epithelial ingrowth, less increase in intraocular pressure , lesser incidence of dry eyes, hemorrhage from limbal ves-
sels less likely and the ability to retreat immediately if there is incomplete FS laser ablation. Loss of suction during FS laser LASIK
ap creation is easier to handle and the suction ring may be reapplied and treatment resumed immediately in many cases.
What are the disadvantages associated with Femtosecond assisted LASIK?
1. Opaque bubble layer (OBL): Gas bubbles may accumulate in the ap interface during FS laser treatment. There is a signicant
reduction in the incidence and extent of OBL when novel LASIK ap ventilation canal parameters of width and spot line sep-
aration are used as in Alcon FS 200.
2. Transient light sensitivity syndrome (TLSS): Also called as good acuity plus photosensitivity (GAPP). TLSS usually occurs days
to weeks after FS laser LASIK. Patients present with photophobia and good visual acuity with paucity of clinical ndings on
exam. It resolves without sequel but requires aggressive topical steroids for weeks.
Are there any other alternatives to LASIK?
I would say Photorefractive keratectomy (PRK). In this procedure only epithelium is removed (so no ap is created) and Excimer
laser is given to the cornea. Recovery time is longer with PRK than with LASIK, though the nal outcome is about the same (very
good). However the disadvantage is that this procedure cannot be performed for higher refractive errors.
Implantable collamer lens or ICL :
In patients with thin corneas, where LASIK / PRK cannot be done, another option would be ICL. Implantable collamer lens or
ICL is a soft, exible gel-lens for the permanent correction of myopia (nearsightedness). The ICL procedure is an intraocular
procedure where an ICL is implanted inside the eye . ICLs consists of a small biocompatible intraocular lens (IOL), also known as
a posterior chamber phakic intraocular lens (PIOLs), with distinct footplates, called haptics, to hold the lens in place within the
OPHTHALMOLOGY
Do you want freedom from
glasses and
contact lenses?
LASIK is the
solution
for you!
Dr Bharti Sharma
Senior Ophthalmologist
Apollo Bramwell Hospital gives a
complete update on LASIK
and its advantages.
cilliary sulcus inside the eye and the anterior vault designed to
minimize contact with the eye’s crystalline lens.
Who are the patients suitable for an ICL ?
Moderate to high myopia(nearsightedness) of -3 to -20 diop-
ters who are not good candidates for LASIK because of thin
corneas.
What are some of the disadvantages of ICL ?
• Infection - Like any intraocular surgery there is a potential
of an infection.
• Increased intraocular pressure - Pressure may build in the
eye after an ICL procedure. The sooner a surgeon is alert-
ed to this complication, the greater the
chance of avoiding serious
damage.
• Repositioning or removal of lens -ICLs
have the potential, however slight, of
needing to be repositioned. The fre-
quency of this complication may vary
by implantable
contact lens
models.