1. Biophysics and Laser Science Unit, Visual Science Department, Research Institute of Ophthalmology, Giza, Egypt
2. Ophthalmology Department, Research Institute of Ophthalmology, Giza, Egypt
3. Pharmacology and Toxicology Department, Pharmacy College, Cairo University, Cairo, Egypt
4. Biophysics Department, Science College, Ain Shams University, Cairo, Egypt