1. Chair and Clinical Department of Ophthalmology, Faculty of Medical Sciences in Zabrze, Medical University of Silesia, Okręgowy Szpital Kolejowy, Panewnicka 65, 40-760 Katowice, Poland
2. Municipal Hospital Group, Truchana 7, 41-500 Chorzów, Poland
3. Eye and Optics Center Augmed, Łabędzka 20d, 44-100 Gliwice, Poland