A B C D E F G H I K L M N O P R S T U V W X Ectopia Lentis Synonym(s) - Lentis, Ectopia Definition: Congenital displacement of the lens resulting from defective zonule formation. Broader term(s) Eye Diseases Lens Diseases Lens Subluxation Ectopia Lentis MeSH © U.S. National Library of Medicine®.