Iris melanocytes may be observed on the anterior lens capsule forming "pigment stars" or "chicken tracks". The central portion may attach to the anterior lens capsule or float with free edges. The peripheral portion always inserts into the iris collarette. Most of the times, it can be seen as single or several lacy strands that partially bridge the pupil. Slit lamp appearance of PPM can be variable. PPMs are usually asymptomatic except for cases with a pupillary opening of <1.5 mm in which decreased retinal illumination and diffraction results in impaired vision. They are congenital in origin, do not affect vision and may be nonaxial. Pure capsular opacities associated with persistent pupillary membranes or epicapsular stars are very rare. Type 3 membranes, which are attached to the cornea, typically occur in Axenfeld-Rieger syndrome.These pigmented stars of the anterior lens capsule are often called “chicken tracks”. In a sub-variant of type 2, pigmented dendritic iris stromal melanocytes, singly and in clumps, are situated aberrantly on the anterior lens capsule. Type 2 membranes are iridolenticular adhesions.
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