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web.archive.org
"Facts About Astigmatism". National Eye Institute. National Institutes of Health. Archived from the original on 2 October 2016. Retrieved 16 June 2019.
Mustafa, Osama M.; Prescott, Christina; Alsaleh, Fares; Dzhaber, Daliya; Daoud, Yassine J. (2019). "Refractive and Visual Outcomes and Rotational Stability of Toric Intraocular Lenses in Eyes With and Without Previous Ocular Surgeries: A Longitudinal Study". Journal of Refractive Surgery. 35 (12): 781–788. doi:10.3928/1081597x-20191021-03. ISSN1081-597X. PMID31830294. S2CID209341790.