The comparability of PPVT and PPVT-R scores among retarded adults were examined. The sample consisted of 96 clients, who had been previously diagnosed as mildly, moderately, or severely retarded. The PPVT (Form A) and PPVT-R (Form L) were administered to all participants in counter balanced order. Significant correlations were found between the two tests for the total sample as well as for females and males. Additionally, the PPVT-R was found to be capable of discriminating differing levels or retardation. However, with the exception of the severely retarded group, mean PPVT-R Standard Score Equivalent (SSE) scores tended to be approximately 20 points lower than PPVT IQ scores. Some clinical implications of these results were discussed.