Eye Clinic Unit

Eye Clinic Unit

The ophthalmology departments of CAN Hospitals are state-of-the-art eye care facilities with ophthalmologists specialized in the treatment and cure of all eye conditions. CAN Hospitals are fully equipped with the most advanced technology and all eye procedures currently available around the world are successfully performed.


The Femto second laser is a laser which emits ultrafast laser pulses in units of femtoseconds (one quadrillionth of a second). When this laser is used in place of a metal blade to cut the corneal flap, the cut created is more precise in both size and shape. It divides material at the molecular level without any transfer of heat or impact on the surrounding tissue.

LASIK Surgery

Time required: 15-30 Min
Anesthesia: Local


Side Effects

Stinging Eyes, itch, burning sensation, blurred vision for 4-5 hours


LASIK Recovery

Back to work: 1 Day
More strenuous activity: 1 Day


The International Patient Services Center at CAN Hospitals offers a comprehensive range of services for international patients and visitors. Our staff is dedicated to;

  • Scheduling medical appointments
  • Making hotel arrangements
  • Arranging ground transportation from the airport
  • Assisting with hospital admissions and physicians
  • Ensuring that you understand the instructions from physicians
  • Obtaining and delivering the copies of medical reports after consultations
  • Facilitating of admission, discharge and follow-up processes
  • Facilitating communication with the physicians of CAN Hospitals after your departure





Femtosecond (FS) laser is an infrared laser with a wavelength of 1053nm. FS laser like Nd: YAG laser works by producing photodisruption or photoionization of the optically transparent tissue such as the cornea. Application of either FS laser or Nd: YAG laser 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 (figure 1). However, the two lasers differ significantly in the amount of collateral damage they cause. Nd: YAG laser has a pulse duration in the nano second range (10-9 second) where as FS laser has pulse duration in the femtosecond range (10-15second). Reducing the pulse duration reduces the amount of collateral tissue damage. In fact, collateral damage with FS laser is 106 times less than with the Nd: YAG laser. This makes FS laser safe for use in corneal surgeries which require exquisite precision.










Clinical applications

FS laser has a wide range of applications in corneal refractive surgery. This includes LASIK flap creation, astigmatic keratotomy (AK), channel creation for implantation of intrastromal corneal ring segments (ICRS), presbyopia correction, femtosecond lenticule extraction (FLEx), small-incision lenticule extraction (SMILE), and intrastromal presbyopia correction. Besides FS lasers are also being used in laser-assisted anterior and posterior lamellar keratoplasty, cutting of donor buttons in endothelial keratoplasty, customized trephination in penetrating keratoplasty, wound construction, capsulorrhexis in cataract surgery, and nuclear fragmentation in cataract surgery. In this article, we will discuss the application of FS laser in LASIK surgery.


LASIK flap creation


The suction ring is centered over the pupil and suction is applied once proper centration of the ring has been ensured and verified. The docking procedure is then initiated while keeping the suction ring parallel to the eye. An applanating glass contact lens is used to stabilize the globe and to flatten the cornea. It is important to achieve complete applanation of the cornea to avoid an incomplete flap or other flap related complications. Once the laser’s computer has confirmed centration, 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 flap. Suction is then released. A spatula is carefully passed across the flap starting at the hinge and sweeping inferiorly to lift the flap for excimer laser ablation.


More than 55% of all LASIK procedures in 2009 were performed with FS laser[5]. The number was 30% in 2006. FS laser offers several advantages over the conventional microkeratomes and is gaining popularity across the globe.

Major advantages of FS laser. Reduced incidence of flap complications like buttonholes, free caps, irregular cuts etc

  • Greater surgeon choice and control over flap diameter and thickness, side cut angle, hinge position and length
  • Increased precision with improved flap safety and better thickness predictability
  • Capability of cutting thinner flaps to accommodate thin corneas and high refractive errors
  • Absence of moving parts

Other advantages include stronger flap adherence, better contrast sensitivity, decreased incidence of epithelial ingrowth, less increase in IOP required, lesser incidence of dry eyes, lesser hemorrhage from limbal vessels less likely, and the ability to retreat immediately if there is incomplete FS laser ablation. Loss of suction during FS laser LASIK flap creation is easier to handle and the suction ring may be reapplied and treatment resumed immediately in many cases. Studies have shown FS laser to be safe and the visual and refractive outcomes of FS laser LASIK are equivalent to microkeratome LASIK.


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