Lasik, a type of refractive surgery that uses laser to change the shape of the cornea and correct vision in cases of refractive defect like myopia, hyperopia, and astigmatism. For one to see clearly light must travel straight through your cornea and lens which in turn will refract the light on the retina sending signals to the brain and converting them as images.
In refractive errors this signalling is damaged such that the light is deflected in a different direction away from the retina, causing the image to be blurry. During the procedure an eye surgeon creates a flap in the cornea — the transparent, dome-shaped surface of the eye that accounts for a large part of the eye’s bending or refracting power .Then the surgeon uses a laser to reshape the cornea, which corrects the refractive errors in the eye .
Femotosecond Laser or bladeless LASIK
Femtosecond laser is a precise ,cutting edge tool that can make corneal surgery accurate and safe. A one of a kind in lasers that emits optical pulses in the domain of femtoseconds ie very short durations – ultrashort pulses. Two types of lasers are used in the procedure that focus the energy on a limited time scale in a single laser pulse achieving multiple light projected emissions. One ensures making a corneal flap with the femtosecond laser as a first step followed by excimer laser correction below the flap as the next step. It can correct up to -8 diopter (D), astigmatism up to 4 D, and hyperopia up to 5 D.
A unique advantage of this technology as seen in industry standards of quality control is to reduce the thermal damage to the material when used. Achieving an effective pulse emission is a short time span ensures a directed to the focal point target with minimal heat dissipation to the surrounding area reducing any post operational hazards.