Read, SA; Collins, MJ; Carney, LG (Ocak 2007). "A review of astigmatism and its possible genesis". Clinical & Experimental Optometry. 90 (1). ss. 5-19. doi:10.1111/j.1444-0938.2007.00112.x. PMID17177660.
Mozayan, E; Lee, JK (Temmuz 2014). "Update on astigmatism management". Current Opinion in Ophthalmology. 25 (4). ss. 286-90. doi:10.1097/icu.0000000000000068. PMID24837578.
Read, SA; Collins, MJ; Carney, LG (Ocak 2007). "A review of astigmatism and its possible genesis". Clinical & Experimental Optometry. 90 (1). ss. 5-19. doi:10.1111/j.1444-0938.2007.00112.x. PMID17177660.
Mozayan, E; Lee, JK (Temmuz 2014). "Update on astigmatism management". Current Opinion in Ophthalmology. 25 (4). ss. 286-90. doi:10.1097/icu.0000000000000068. PMID24837578.
talyatipmerkezi.com
Tayla Tıp Merkezi. "Kırma kusurları". www.talyatipmerkezi.com. 8 Ocak 2017 tarihinde kaynağından arşivlendi. Erişim tarihi: 7 Ocak 2017.