Skip to main content
. Author manuscript; available in PMC: 2007 Sep 17.
Published in final edited form as: Ophthalmol Clin North Am. 2004 Mar;17(1):7–20. doi: 10.1016/j.ohc.2003.12.001

Fig. 17.

Fig. 17

Limitation of the conventional angle opening distance (AOD) measurement. (A) and (B) have exactly the same value for the AOD and trabecular–iris angle (TIA, θ 1). Nevertheless, the angle in (B) is gonioscopically narrower and is more likely to be occludable than the normal-appearing angle in (A).