A crucial, but little studied, visual function involves estimating distance from the self to an object in the environment (absolute distance perception). This is a fundamental component in the creation of our perception of the 3D world and is likely to be affected by alcohol, and be a factor in drunk driving accidents. To better understand which visual cues observers use to determine distance, participants completed a series of psychophysical judgments under different viewing conditions. By controlling and isolating specific distance cues through a novel viewing apparatus, we were able to investigate which cues are used to accurately judge distance. Alcohol intoxication allows us to selectively investigate the specific visual systems that are and are not involved in contributing to the accuracy of this type of task. Finally, an investigation of the effects of training and feedback on distance estimation tasks in a real 3D environment was also conducted. In summary, this research attempted to uncover not only how the visual system processes spatial information, but also how visual processing changes with alcohol intoxication with implications for understanding alcohol-related visual-spatial dysfunction that may arise in drunk driving. These findings will then be applied to a real world, 3D outdoor environment while investigating the impact of training and feedback on a distance estimation task.