Fig. 8 Anterior chamber depth. Ethnicity creates gonioscopic expectations. The insertion of the iris into the ciliary body band is partly genetically determined. This fact is useful in the early diagnosis of angle closure glaucoma and recognizing angle recession. A. The iris inserts just below the scleral spur in this goniophotograph from an Asian patient. This is a common angle configuration for Asians and may predispose to chronic angle closure disease. B. The iris inserts much deeper into the ciliary body band (green arrow). This is the most common angle configuration for a Caucasian. The patient's ethnicity prompts the examiner to be on the alert for angle closure disease.