1. Hofmann H (1956) Acute keratoconus with mongoloid idiocy. Klin Monbl Augenheilkd Augenarztl Fortbild 129:756–762
2. Shapiro MB, France TD (1985) The ocular features of Down’s syndrome. Am J Ophthalmol 99:659–663
3. Hestnes A, Sand T, Fostad K (1991) Ocular findings in Down’s syndrome. J Ment Defic Res 35:194–203
4. Woodward MA, Blachley TS, Stein JD (2016) The association between sociodemographic factors, common systemic diseases, and keratoconus: an analysis of a nationwide heath care claims database. Ophthalmology 123(457–65):e2
5. Van Splunder J, Stilma JS, Bernsen RMD, Evenhuis HM (2004) Prevalence of ocular diagnoses found on screening 1539 adults with intellectual disabilities. Ophthalmology 111:1457–1463