Photorefractive Keratectomy (PRS)
This vision correction procedure was first introduced in 1988. PRK used an excimer laser to reshape the patient’s cornea. In this surgery the outer cells or the epithelium is removed and the exciser laser helps evaporate the corneal tissue. The eye skin layer subsequently regrows, with the patient wearing soft contact lens for up to 5 days.
Lasik (Laser assisted)
Soon after PRK, Lasik was introduced. It was a term that became popular in the 1990s and has since become one of the most effective refractive surgeries in the world. Lasik uses a precision surgical instrument to combine the creation of the flap called microkeratome. By the early 2000s the microkeratome was replaced when further improvements were made in precision tools and a different instrument, femtosecond laser was introduced. The femtosecond is used by the eye surgeon to make a small thin flap below the epithelium on the tissue underneath. The permanent tissue is reshaped and the flap is folded back into its original place. When it comes to recovery time Lasik offers for quicker recovery than PRK.
ReLEx SMILE (Refractive Lenticule Extraction)
ReLEx SMILE was first introduced in 1996 with Carl Zeiss Meditec introducing the VisuMax femtosecond laser. It was a state of the art technology with refractive surgery being transformed by ReLEx SMILE into minimally invasive eye surgery. The laser makes a series of pulses to create a lens shape and a small keyhole to link to the surface. The eye surgeon will remove this lens shape manually and the procedure is complete within minutes. SMILE is an improvement on comfort and efficiency of Lasik. The procedure is appropriate for patients with wide range of eye problems, it is minimally invasive, with quick recovery time and reduces post procedure side effects.