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The level of light intensity (illuminance) directed specifically onto the area where a visual task is being performed (the 'task plane'), such as a desktop, surgical site, or reading page, to ensure clarity and comfort.
read more about working illumination ...Measured in lux ($ ext{lx}$) or foot-candles ($ ext{fc}$). Optimal levels vary dramatically: reading requires $300 ext{ lx}$ to $500 ext{ lx}$, while precision surgery requires significantly more.
Inadequate working illumination leads to eye strain and fatigue; excessive illumination can cause glare and discomfort, highlighting the need for proper contrast.
In ophthalmic surgery, the working illumination must be high enough for the surgeon to see minute details clearly but must not generate excessive heat or glare for the patient.
Test illumination is the ambient light level for a standardized test. Working illumination is the task-specific light level needed for real-world performance.
Scattered light that falls across the task plane, reducing the contrast and requiring higher working illumination to overcome it.
Yes. Due to changes in pupil size and lens clarity, older individuals typically require two to three times more working illumination for the same visual task as younger individuals.