2FEMTOSECOND(This definition follows U.S. usage in which a billion is a thousand million and a trillion is a 1 followed by 12 zeros.)A Femtosecond is one millionth of a nanosecond or of a second and is a measurement sometimes used in laser technology
3LIGHT SPECTRUM Wavelength (µm) 10 1 Lasers Television Short Wave MicrowavesFM RadioAM Radio10-33691-6Gamma RaysX-RaysUltravioletInfraredRadio WavesIonizing RadiationThermal/Heat Radiation
5INTRALASE® FS laser Femtosecond laser (Nd:Glass) 1053 nm (near infrared)Each pulse of focused laser light lasts approximately seconds ( femtoseconds)In one second, light travels 7.5 times around the globeIn 100 femtoseconds, light travels across a human hairPower = Energy/Time, extremely high power attained at relatively low energy
16BLADE MICROKERATOME COMPLICATIONS Microkeratome complications occur in up to 10 percent of all LASIK procedures, including the most serious complications that may affect the visual outcome of a LASIK procedure (Ambrosio and Wilson, Osman).
17POSSIBLE COMPLICATIONS Partial and Incomplete FlapsFree FlapButton HoleSuction LossEpithelial Abrasion.Diff. thickness at different curvatures.Dry eye Problem
18POSTPONE ….????If any of the Flap related complication occurs like incomplete flap, Button Hole, etc., the only option left is to reschedule the surgery.
19INTRALASE Blade free method Flap creation Intralase FS laser is an advanced technology and represents a major improvement in LASIK surgery.Offers versatile capability and flexibility in customizing flap creation with even, clean edges, regardless of the size or shape of the eye.With programmed parameters, the Intralase performs exactly as programmed with precise, predictable outcomes, transforming the science of creating the corneal flap into an artful application of technology.Patient Comfort -fast surgical procedure hence there is no trauma to the eye, no patient discomfort, patients tend to be very relaxed during the surgery, confident that the laser is performing as expected.
21LOWER IOPThe suction ring used with the INTRALASE FS Laser creates an intraocular pressure (IOP) of approximately 40 mm Hg.In contrast, the suction ring used with a microkeratome raises IOP to 80 mm Hg or more, a much higher and potentially less safe level.
22FLAP THICKNESS Desired flap thickness accuracy ~ 5-10µ In reality the thickness ~3-8µ
23UNIFORM FLAP THICKNESS The entire Cornea is applanated (flatten) uniformly then the laser works on planner surface.The Highly precise Laser pulses focused to precise intrastromal locations.Flap is always uniform thickness from side to side .Furthermore the uniform thickness and Vertical cleavage plane fits the flap like a manhole cover, minimise the chance of flap slippage or wrinkling if accidentally rubbed or bumped during healing after surgery.
24IMMEDIATE REPETITION WITH NO ADVERSE EFFECTS If the surgeon encounters a loss of vacuum during flap creation with the Intralase laser, the flap creation can be repeated immediately with no known adverse affects.In contrast, complications occurring during the creation of a flap with a microkeratome may require three months of healing before a repeat procedure can be attempted.
25REDUCED RISK OF COMPLICATIONS As there are little to no possibilities of corneal abrasion, such situations as thin flap, thick flap, partial flap, incorrect diameter or buttonhole flap can be addressed.In addition, with the resulting flap has uniform thickness across the diameter, use of the IntraLASIK approach is ideal for hyperopes, large pupils, moderate to high astigmatism, and small corneal diameters where producing a large enough flap for a blend zone is an issue.Producing a uniform ablation far into the periphery is critical in these cases.
26EPITHELIAL INGROWTH - CONTROLLED Further, the laser’s ability to create a very thin flap maintains optimal stromal bed thickness when treating higher refractive errors or thinner corneas.Because the IntraLASIK software enables the laser to produce flaps with vertical edges, it is more difficult for epithelial cells to migrate down under the flap into the interface since the length of the route for those cells is increased.
27EXCEPTIONAL SURGEON CONTROL Surgeons gain exceptional control in the creation of corneal flaps.The computerized IntraLASIK software allows the surgeon to set predictable controls for micron precision and consistency in flap diameter, depth, hinge location and width and side cut architecture, which varies by individual patient corneal anatomy.Such precision virtually eliminates corneal flap complications.
28INTRALASE IN EYE SURGERY Intralase is not only used for Lasik for glass free vision but also for treatment of conical (keratoconus) cornea and corneal (eye) transplants for better results
29PATIENTS GAIN CONFIDENCE Patients gain confidence in choosing vision correction surgery.The higher degree of comfort and safety, virtually no risk of complications, and more predictable outcomes increase patient satisfaction in their experience and outcome.
30CONCLUSION Major advancement in lasik Higher degree of safety and precisionPredictable outcomeFaster visual recoveryIncreased patient satisfaction and comfortEnhanced quality of visionApproved by FDA, NASA for astronaut and US air force