In the early days, most cataract operations in developing countries involved removing the whole lens from the eye, including the thin capsule which contained it. Because the natural lens of the eye had been removed, the patient was then left with no focusing mechanism and needed thick ‘coke bottle' glasses. This solution provided poor quality vision and was often temporary.
Fortunately this method is no longer used; instead an intraocular lens (IOL) is inserted.
Sir Harold Ridley a British doctor was the first person to successfully implant an IOL in 1949. The idea of using an IOL came after one of his students asked why the lens removed during cataract surgery was not replaced.
The very first IOLs were made of glass, which made them heavy and prone to shattering.
He then began to make them from polymethyl methacrylate (PMMA) which is like perspex, after noticing that soldiers who sustained eye injuries from shattered windshields during World War II did not show any reaction to the material.
The intraocular lens did not find widespread acceptance in cataract surgery until the 1970s. They were also very expensive. Until the mid-1990s these tiny lenses cost around US$150 each, pushing cataract surgery well out of reach of people in developing countries.
Following the initiative of the late Professor Fred Hollows, The Foundation helped establish factories in Nepal and Eritrea to produce IOLs at a much cheaper cost.
Through Fred's vision, the factories are helping to reduce poverty for people in Nepal and Eritrea, as well as countless numbers of people throughout the world.
Monday, 12 July 2010
The IOL Story
via hollows.org.au
