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. Author manuscript; available in PMC: 2015 Jun 1.
Published in final edited form as: Ophthalmology. 2014 Feb 15;121(6):1194–1202. doi: 10.1016/j.ophtha.2013.12.027

Figure 2.

Figure 2

An illustration of trabecular–iris space area measured at 500 μm from the scleral spur (TISA500) and trabecular–iris space area measured at 750 μm from the scleral spur (TISA750). TISA500 was defined as the trapezoidal area with the following boundaries: anteriorly, a perpendicular line between the inner corneoscleral wall and the iris surface at 500 μm anterior to the scleral spur; posteriorly, a line perpendicular to the inner corneoscleral wall extending from the scleral spur to the iris surface; superiorly, the inner corneoscleral wall; and inferiorly, the iris surface. The same method was used for TISA750.