The mechanical irritation of mispositioned intraocular lens over iris, ciliary body or iridocorneal angle cause spectrum of iris transillumination defects including anterior<unk> ,<unk>  and elevated intraocular pressure (IOP).<unk>  results from mechanical breakdown of the blood–aqueous barrier and resultant intraocular inflammation. A<unk>  results from damage to vascular tissue of the iris, ciliary body, or angle by mispositioned IOL. Elevated intraocular pressure can be caused by pigment dispersion,<unk> ,<unk>  or direct blocking of aqueous humor drainage system. UGH syndrome is most commonly caused by anterior chamber IOLs and sulcus IOLs, but it can be seen with any type of IOL, including posterior chamber lenses and cosmetic iris implants. The condition has significantly reduced due to increased use of posterior chamber IOLs, advancements in lens design, IOL material and surgical techniques etc. Currently, majority of IOLs are implanted in the capsular bag, minimizing the chance of IOL contacting uveal structures.
Uveitis–Glaucoma–Hyphema syndrome
Branchio-oto-renal syndrome
Rabbit syndrome
Adams–Stokes syndrome
Oculocerebrorenal syndrome
Acro–dermato–ungual–lacrimal–tooth syndrome
Woodhouse–Sakati syndrome
Decompression sickness