Posterior synechia refers to the adhesion of the iris to the lens within the eye. This condition can cause a range of symptoms, including blurred vision, eye pain, photophobia, and even vision loss. Some synonyms for posterior synechia include iris-lens adhesion, pupillary block, and posterior synechial angle closure. These terms all refer to the same condition in which the iris and lens become stuck together, leading to a reduction in fluid flow and pressure build-up within the eye. It is important for individuals experiencing symptoms of posterior synechia to seek prompt medical attention from an eye specialist to prevent permanent damage to the eye and vision.