1. Cornea Research Chair, Department of Optometry, College of Applied Medical Sciences, King Saud University, P.O. Box 10219, Riyadh 11433, Saudi Arabia
2. Department of Chemistry, College of Science and Humanities, Shaqra University, Duwadimi, Saudi Arabia
3. Applied Organic Chemistry Department, National Research Centre, Dokki, Giza, Egypt
4. School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK