Aniridia is the absence of the iris. It occurs in 1 in 50,000 people in the UK.
Aniridia may be associated with Wilm's tumour; one in 40 Wilms' patients have aniridia.
Aniridia may be part of a global defect in the development of the anterior segment of the eye called mesodermal dysgenesis.
Last reviewed 01/2018