1. Department of Optometry, University of Benin, Benin City 300238, Nigeria
2. Department of Ophthalmology, University Hospital of Udine, 33100 Udine, Italy
3. Centre for Sight Africa, Nkpor, Onitsha 434112, Nigeria
4. Department of Plastic Surgery, University Hospital of Udine, 33100 Udine, Italy