Dr. Khalifa received his Ph.D. ( Tanta University, Tanta, Egypt) thesis in the evaluation of emmetropia after cataract extraction and IOL implantation in 1985. He was the first one to stress on the importance of white to white diameter in the anticipation of PO IOL position ( a formula called TNT formula). He had his fellowship in Cataract IOL from University of Tennessee Center for Health Sciences in 1985, TN, USA.
His research is focused on correction of the refractive condition of the eye either by corneal refractive surgery or lenticular refractive surgery through premium IOL’s. He published many papers in the field of customized LASIK with meticulous evaluation of HOA’s.
He received the international achievement award from AAO in 2016 for his work in the past 20 years. He is a reviewer for many international journals for several years. Also, he is a President of Egyptian Refractive Club (ERC).