Figure 7 plots the stereo benefit upon binocular correction and better eye correction at different viewing durations. The benefit here corresponds to the ratio of stereoacuity with baseline correction to binocular or better eye correction. In most cases, HOA correction brought improvement in stereoacuity so that the benefit was larger than 1. In some cases for which better eye correction brought negative effects, the benefit was less than 1. As the viewing duration increased, binocular correction benefit exhibited a clear downward trend in all subjects. These benefits were commonly in the range of 1.1 to 1.3, except for the maximum benefit of 1.68 demonstrated in Subject 2 at 100 ms. As for better eye correction, the situation was also split into two parts. For Subject 2 and Subject 3, better eye correction benefit decreased slightly to above 1.0 with increasing viewing duration, just as the binocular case. However, for Subject 1, this relationship was exactly the opposite, with the benefit elevated from 0.56 at 100 to 0.67 at 500 ms. It seemed that the benefit upon HOA correction, no matter binocular or better eye, approached the level of 1.0 with increasing viewing duration. Further statistical analysis indicated that binocular correction benefit was significantly greater than 1.0 at 100 and 300 ms (, 0.028, and 0.071 for 100, 300, and 500 ms, respectively). Better eye correction benefit, however, was not significantly different from 1.0 at any viewing duration (, 0.788, and 0.505 for 100, 300, and 500 ms, respectively). Moreover, no significant difference was observed between any two durations for both binocular correction benefit (, 0.209, and 0.097) and better eye correction benefit (, 0.487, and 0.379).