Keratoconus - Screening in Patients With Downs Syndrome

The initial purpose of the study is to determine the true tomographic based age-specific prevalence of keratoconus among Danish patients with Downs Syndrome. If, as expected, the prevalence is sizeable, the next step is to determine the optimal age for screening - considering both sensitivity and specificity as well as the need for early diagnosis in order to preserve a good visual acuity with glasses. Lastly, the overall purpose based on the finding in the study is to evaluate if a tomographic screening program for keratoconus among patients with Downs syndrome is beneficial in Denmark. In addition, a sub-study will further have the purpose to investigate whether patients with Downs syndrome are using optimal correction. With the purpose of generating knowledge about refraction of this specific patient group - independent of whether they are diagnosed with keratoconus or not. The study will invite all persons with a genetic test either prenatal or postnatal showing trisomi 21 / Downs syndrom in Denmark and between the age og 10 and 20 years of age.