The
pars plana is part of the
uvea,
choroidea, one of the three layers that comprise the
eye. As a part of the ciliary body, it is about 4 mm long, located near the point where the
iris and
sclera touch and is scalloped in appearance. The pars plana may not have a function in the post-fetal period, making this a good site of entry for ophthalmic surgery of the posterior segment (pars plana vitrectomy).