Definition: A gonioscope or goniolens is used together with a slit lamp by an optometrist or ophthalmologist to view the front part of the eye between the cornea and the iris. This area is referred to as the "iridocorneal angle" and contains the drainage canals that carry the aqueous humor fluid out of the eye. This canal may appear open, narrow, or closed, an important observation in the treatment of glaucoma.
The goniolens is usually placed directly onto the cornea. Although gonioscopy is painless, an anesthetic eye drop is placed into the patient's eye to improve comfort and decrease anxiety.
Also Known As: Goniolens
