A synechia is an eye condition where the iris adheres to either the cornea (i.e. anterior synechia) or lens (i.e. posterior synechia). Synechiae can be caused by ocular trauma, iritis or iridocyclitis and may lead to certain types of glaucoma. It is sometimes visible on careful examination but usually more easily through an ophthalmoscope or slit-lamp.
Adhesions between the iris and other structures in the eyes occurs due to inflammation in the iris and are particularly common with anterior uveitis (inflammation of the dark tissues of the eye) and trauma to the eye.
Common symptoms associated with this condition are
Corneal lesions, such as ulcers
Variation in the color of the iris
Opacity of the lens
Decreased papillary reaction to light