Persistent pupillary membrane ( PPM ) : PPM is rare, but possible.
2.
Major problems can include OCD, entropion, progressive retinal atrophy ( PRA ), and persistent pupillary membranes ( PPM ).
3.
On the inner edge lies a prominent structure, the collarette, marking the junction of the embryonic pupillary membrane covering the embryonic pupil.
4.
The breed can also fall victim to progressive retinal atrophy ( a degeneration of the retina causing blindness ) and several less serious hereditary eye problems such as coloboma ( a hole in the eye structure ), and persistent pupillary membrane ( tiny threads across the pupil ).
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