1. Department of Pediatric Ophthalmology and Strabismus, Medical University of Bialystok, Waszyngtona Street 17, 15-274 Białystok, Poland
2. Department of Ophthalmology, Medical University, Mariana Smoluchowskiego 17, 80-214 Gdańsk, Poland
3. Bialystok University of Technology, 45A Wiejska Street, 15-351 Białystok, Poland