CITY CONDITIONS UPDATE: The Wills Eye Hospital building, staff, and patients have been safe during the protests in the City. We will continue to monitor the situation. Friday care will proceed as scheduled at 840 Walnut Street unless conditions change. Please contact your physician if you are unable to keep your appointment.

Peters Anomaly

Peters anomaly is a developmental sequence abnormality which occurs during weeks 4-7 of embryologic growth and is caused by a failure of the lens to form properly from the surface ectoderm that overlies the developing eye (optic vesicle).