1 Clinical Department of Ophthalmology, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice, Poland.
2 Department of Ophthalmology, University of Debrecen, Debrecen, Hungary.
3 Department of Biomedical Computer Systems, Faculty of Computer Science and Materials Science, Institute of Computer Science, University of Silesia, Sosnowiec, Poland.
4 Instituto Oftalmológico Fernández-Vega, Oviedo, Spain.