Persistent pupillary membrane (PPM) is a condition of the eye involving remnants of a fetal membrane that persist as strands of tissue crossing the pupil. The pupillary membrane in mammals exists in the fetus as a source of blood supply for the lens. It normally atrophies from the time of birth to the age of four to eight weeks.
Persistent pupillary membrane (PPM) is an eye condition where remnants of fetal tissue, forming strands that cross the pupil, remain after birth. This tissue was initially a source of blood supply for the lens in the fetus and typically shrinks by the time the child is four to eight weeks old.