1. Department of Ophthalmology, St. Barbara Hospital, Trauma Centre, Medykow Square 1, 41200 Sosnowiec, Poland
2. Chair and Clinical Department of Ophthalmology, Division of Medical Science in Zabrze, Medical University of Silesia, Panewnicka 65 Str., 40760 Katowice, Poland
3. Department of Ophthalmology, District Railway Hospital, Panewnicka 65 Str., 40-760 Katowice, Poland
4. Faculty of Medicine, University of Technology, Rolna 43 Str., 40-555 Katowice, Poland