The optical quality of the human eye has been widely studied in recent years, as well as its influence on the visual performance. This optical quality depends on the state of the ocular media. Some external factors also can have an influence on optical quality, such as pupil dilation under low illumination conditions, where the intraocular scattering and ocular aberrations are expected to augment, contributing to the deterioration of the retinal-image quality. All these aspects can interfere with visual performance, as previous studies have demonstrated, but also consumption of some types of substance, such as alcohol, can have a negative impact on visual functions, hampering many of the daily tasks that require keen vision and full visual performance, such as driving, especially under nighttime conditions. The World Health Organization (WHO) lists alcohol as one of the main causes of traffic accidents