The Burial of the Count of Orgaz

https://www.khanacademy.org/humanities/renaissance-reformation/xa6688040:spain-portugal-15th-16th-century/xa6688040:16th-century-spain/a/el-greco-burial-of-the-count-orgaz

https://perception.jhu.edu/files/PDFs/13_El_Greco_History/El_Greco_History_Perception_2013.pdf

https://www.aao.org/eye-health/diseases/what-is-astigmatism

https://quote.ucsd.edu/anstislab/files/2012/11/2002-Was-El-Greco.pdf

https://www.artsy.net/article/artsy-editorial-curious-subculture-diagnosing-dead-artists-work

https://findanexpert.unimelb.edu.au/news/5699-how-eye-disorders-may-have-influenced-the-work-of-famous-painters