MRS.DR. ANKITA RACHURI

DR. SATHYA RAVILLA, DR. MAHIMA BANKAR

Abstract

Persistent pupillary membrane(PPM) is the remnant of tunica vasculosa lentis supplying nutrition to the lens during fetal life. It is commonly seen in healthy newborn and usually disappears within the first year of life. This case of a 13 year old girl is distinctive as she has bilateral thick PPM with a normal fundus, visual acuity of 6/9 in both eyes, binocular single vision maintained for both near and distance and with a stereopsis 120 seconds of arc. Even though PPM is thick in this child, due to the stenopic effect, these multiple pinholes reduce the width of incoming rays of light producing a ‘pencil of light’ and the peripheral rays are blocked by the thick membrane which resulted in a clear image. Along with multiple pinholes being present, as the size of the useful pinhole is more than 1.5mm in diameter, the visual development has not been compromised.