Fig 1.
An example of generating a side-by-side Randot stereogram image with a ‘star’.
Fig 2.
New stereotest using a 3-dimensional (3D) display with the (A) conventional method and (B) proposed method.
(A) The conventional stereotest using a 3D monitor display. The 3D monitor and shutter glasses cause binocular disparity and the subject feels the difference in depth between the stereoimage and the background as shown. In this case, the stereoimage is located in front of the 3D monitor panel and the background image is located at the 3D monitor. (B) The proposed stereotest using a 3D monitor display. The 3D image is located at the 3D monitor panel and the background image is located behind the 3D monitor as shown.
Fig 3.
Bland—Altman plots showing the concordance between near and distance 3-dimensional (3-D) stereotests and the Randot stereotest in children.
The magnitude of the test differences did not seem to be dependent on the level of stereoacuity. The concordance between the Randot stereotest and the two 3D stereotests are presented on the Bland—Altman plots in Fig. 3(A-F). The results of the conventional 3D stereotest were poorer than that of the corresponding Randot test for the near tests (mean difference: 0.28 log arcsec [0.93 octave], Fig. 3A) and better for the distance tests (0.21 log arcsec [0.70 octave], Fig. 3D). The results of the proposed 3D stereotest were poorer than that of the corresponding Randot test for the near tests (0.25 log arcsec [0.83 octave], Fig. 3B) but similar for distance tests (0.02 log arcsec [0.07 octave], Fig. 3E). The results of the conventional 3D stereotest were similar with the corresponding proposed 3D stereotest for the near tests (mean difference: 0.05 log arcsec [0.17 octave], Fig. 3C), but better for the distance tests (0.24 log arcsec [0.80 octave], Fig. 3F).
Table 1.
Classification of agreement between the Near 3D stereotest (proposed) and the Randot Stereotest by individual subjects.
Table 2.
Categorical agreement between the Distance 3D stereotest (proposed) and the Distance Randot stereotest by individual subjects.
Table 3.
Proportion of subjects with a categorical stereoacuity difference of more than 1 level between the proposed 3D stereotests and Randot stereotests at near and distance.