Dr. El Hage received his O.D. Degree from the Pennsylvania College of Optometry and his Ph.D. and D.Sc from the University of Paris. He holds several patents and trade-marks on ophthalmic devices . He has published numerous articles and chapters in scientific journals and books. He also co-authored a book with professor Yves Le Grand on optics of the eye, published by Springer Verlag. He has taught at the University of Paris and the University of Houston College of Optometry.