How safe is Perspex?
It first went into eyes inadvertently in 1940, in the Battle of Britain when the cockpit canopies of fighter pilots shattered. The fact that it caused no inflammation led Harold Ridley use it in eyes as lens replacements for cloudy natural lenses (cataracts) in 1949, and over 300 million have been implanted with no problems of rejection or inflammation in all that time. The same has been true for intracorneal rings.
