scope:

This document provides an overview of visual perceptions and performance, covering topics such as brightness, glare, flicker, visibility, and illuminance criteria. It introduces scientific literature and past research results but does not serve as a complete literature review on any specific topic. The document provides basic descriptions and background of visual phenomena in order to guide lighting practitioners. For some topics, established formulas and processes are reviewed, but specific criteria or other recommendations are not provided. This document begins with a review of psychophysics, which is the primary method of study for perception and performance, in order to help readers understand the strength and limitations of the provided material.