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Posterior Chamber of the Eye

camera posterior bulbi

The posterior chamber of the eye is the small fluid-filled space between the posterior iris surface and the anterior lens surface (and the ciliary processes laterally). It is filled with aqueous humour produced by the ciliary body epithelium. Aqueous flows from the posterior chamber through the pupil into the anterior chamber and drains via the trabecular meshwork. Posterior chamber depth determines the space available for posterior chamber intraocular lens implantation.

Region: Head & Skull

Clinical Relevance

Clinical Notes

The posterior chamber is the site for posterior chamber intraocular lens (PC-IOL) implantation after cataract extraction — the standard placement behind the iris and in front of or within the capsular bag. It is also where pigment dispersion syndrome occurs: posterior bowing of the iris causes iris-lens friction, liberating pigment from the posterior iris into the aqueous with eventual trabecular obstruction producing pigmentary glaucoma. Posterior chamber depth assessment is important before implantable collamer lens (ICL) insertion for myopia correction, ensuring adequate space to avoid lens-iris touch.

Pathology

Common Injuries & Conditions

Posterior Chamber IOL Implantation in Cataract Surgery

Phacoemulsification cataract extraction is completed by implanting a foldable posterior chamber IOL within the capsular bag in the posterior chamber space; the lens unfolds behind the iris where it is permanently retained by the intact posterior capsule, with posterior capsule opacification (secondary cataract) treated by Nd:YAG laser capsulotomy.