Thirty-one subjects underwent imaging with both HD-OCT and AS-OCT. The Venn diagram (Figure 3) shows the agreement between gonioscopy, HD-OCT, and AS-OCT in detecting eyes with angle closure. Angle closure in a nasal or temporal quadrant was observed in 11, 10, and 8 eyes with gonioscopy, AS-OCT, and HD-OCT, respectively (gonioscopy vs AS-OCT, κ = 0.64; McNemar, P > .99; gonioscopy vs HD-OCT, κ = 0.63; McNemar, P = .38; AS-OCT vs HD-OCT, κ = 0.53; McNemar, P = .69). Anterior segment OCT identified 8 of 11 eyes while HD-OCT identified 7 of 11 eyes diagnosed with angle closure on gonioscopy (P > .99, Fisher exact test). Once again, identical results were obtained when considering all 4 quadrants for gonioscopy, as all eyes with a closed angle in any quadrant had either the nasal or temporal quadrant also closed.