Barraquer’s early work
In the 1950s, the microkeratome and keratomileusis techniques were developed in Bogotá, Colombia by the Spanish ophthalmologist Jose Barraquer. In his clinic, he would cut thin (one hundredth of a mm thick) flaps in the cornea to alter its shape. Barraquer also investigated how much of the cornea had to be left unaltered in order to provide stable long-term results.This work was followed by that of the Russian scientist, Svyatoslav Fyodorov (1920-2000), who developed the Radial keratotomy (RK) in the 1970s and designed the first posterior chamber implantable contact lenses (phakic intraocular lens) in the 1980s.
In 1968, at the Northrop Corporation Research and Technology Center of the University of California, Mani Lal Bhaumik was developing the carbon-dioxide laser. This was the origin of the excimer laser, the cornerstone of laser eye surgery. At a May 1973 meeting of the Denver Optical Society of America, in Denver, Colorado, Bhaumik announced his success with laser and later patented his invention.
Application of medical laser to refractive surgery
In 1980, Rangaswamy Srinivasan, at the IBM Research laboratory, discovered that an ultraviolet excimer laser could etch living tissue, with precision and with no thermal damage to the surrounding area. He named the phenomenon “ablative photo-decomposition” (APD). Five years later, in 1985, Steven Trokel at the Edward S. Harkness Eye Institute, Columbia University in New York city, published his work using the excimer laser in radial keratotomy. He wrote,
- “The central corneal flattening obtained by radial diamond knife incisions has been duplicated by radial laser incisions in 18 enucleated human eyes. The incisions, made by 193 nm far-ultraviolet light radiation emitted by the excimer laser, produced corneal flattening ranging from 0.12 to 5.35 diopters. Both the depth of the corneal incisions and the degree of central corneal flattening correlated with the laser energy applied. Histopathology revealed the remarkably smooth edges of the laser incisions.”