Table 4.

Areas of fusion triangles in far and near vision

		Average Areas of Fusion Triangles		Near Fixations: Least-Squares Linear Fitting of Vertical Disparities as a Function of Horizontal Disparities
Subjects/Session	Trials (n)	Far fixation, (arc degree)2	Near fixation, (arc degree)2	Horizontal offset, °	Vertical offset, °	Slope	R2
M1
48*	5 of 11	0.005 (0.007)	0.001 (0.001)	0.0001	−0.0002	1.8	1.00
49	25	0.001 (0.002)	0.005 (0.007)	0.0007	−0.001	1.7	1.00
68	7	0.015 (0.03)	0.05 (0.04)	−0.0080	0.01	1.8	0.99
70	26	0.1 (0.15)	0.3 (0.1)	−0.07	0.1	1.6	0.90
M2
41*	26 of 47	0.08 (0.07)	0.04 (0.02)	0.005	−0.006	1.3	0.90
43	27	0.01 (0.01)	0.06 (0.05)	0.04	−0.06	1.7	0.96
44*	36 of 42	0.03 (0.03)	0.5 (0.3)	0.2	−0.18	0.9	0.95
45	25	0.02 (0.02)	0.006 (0.009)	0.001	−0.001	1.4	0.99
47	17	0.01 (0.01)	0.003 (0.006)	−0.001	0.002	1.6	0.99
48	25	0.02 (0.01)	0.01 (0.01)	0.0003	−0.0005	1.6	0.98
52	73	0.01 (0.01)	0.08 (0.05)	0.03	−0.04	1.2	0.96
M2**
57	14	0.009 (0.006)	0.006 (0.006)	0.002	0.003	−1.5	0.99
59*	6 of 10	0.01 (0.007)	0.006 (0.007)	−0.002	−0.004	−1.5	1.00
M3
42	19	0.02 (0.01)	0.004 (0.003)	0.008	−0.01	1.3	0.98

Values are means (SD). The areas were obtained by Heron's formula based on the location of the fixation and Helmholtz points. Horizontal and vertical disparities relative to the Helmholtz point estimated by the offsets of linear least-squares fit of disparities in near vision.

^*In these sessions, only part of the fixations fulfilled the fusion criteria as indicated.

^**Trials with near target 10° above horizontal plane of regard.