1. Important Causes of Visual Impairmen in the World Today;Congdon;JAMA,2003
2. Retreatment for significant regression after excimer laser photorefractive keratectomy;Gartry;A prospective, randomized, masked trial. Ophthalmol,1998
3. Recent advances in refractive surgery;Yu;CMAJ,1999
4. Making sense of refractive surgery in 2001: why, when, for whom, and by whom?;Mannis;Mayo Clin Proc,2001
5. The History of Spectacles [Online] http://www.augen.de/English/Brille_linsen/brillen.html [Accessed 27.1.2004]