Isolated ectopia lentis (IEL) is a rare, clinically variable, eye disorder characterized by dislocation of the lens, often causing significant reduction in visual acuity. The disease is isolated ectopia lentis (MONDO_0015998, a Monarch Disease Ontology identifier). Also known as: IEL, ectopia lentis syndrome, familial ectopia lentis, isolated lens position anomaly, nonsyndromic lens position anomaly.