Differential Diagnosis
Secondary pupillary block
- Uveitis causing posterior synechiae and secluded pupil
- Lens-related disorders (eg ectopia lentis, malpositioned intraocular lens)
- Pupillary block due to vitreous prolapse
Anterior pulling mechanism
- Neovascularization of the iris
- Epithelial or fibrous ingrowth
- Iridocorneal endothelial syndrome
- Contracture of the inflammatory precipitates in uveitis
- PAS following anterior segment surgery
Posterior pushing mechanism
- Conditions affecting the posterior segment leading to the forward shift of the lens-iris diaphragm
- Aqueous misdirection (malignant glaucoma)