Check out this web tool! The Cornell University Ergonomics website has a vast number of ergonomics resources, ranging from the NIOSH Lifting Equation to the Cornell Visibility Calculator. Cornell’s site also includes diverse written materials as well as common assessment tools like the RULA and REBA.
The Visibility Calculator estimates the level of light required to obtain the same visibility for people of various ages as well as tasks that require different visual demands. The base level of visibility is equivalent to a 20-year-old person. All that is required from you is to enter the current light level measured in foot-candles. You’ll be able to obtain the desired light levels for each person in the work area and provide a better work environment.