We examined the effects of convergence and viewing distance on perceived depth of phantom and conventional stereopsis. Three stimuli were Gillam and Nakayama's (1999) and Liu et al.'s (1994) phantom stereograms, and RDS. In Experiment 1 and 2, the perceived depth was measured as a function of the convergence angle (4°, 8°, 12°, 16°and 20°) and the size of unpaired region (0.4, 0.7 and 1.0 mm) while the viewing distance was held constant. In Experiment 3, the perceived depth was measured as a

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... ction of the viewing distance (60, 80, 100, 120 and 140 cm) and the size of unpaired region (1.6, 1.8 and 2.0 mm). The results of the three experiments showed that: (a) the magnitude of perceived depth increased as the convergence angle decreased and (b) when convergence and the viewing distance covaried, the depth scaling by convergence information became more effective for both phantom and conventional stereopsis. We conclude that both the phantom and conventional stereopsis have similar processes to scale apparent depth by convergence or the viewing distance information.