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The specific level of light intensity (luminance) used to illuminate the stimulus object (target) being presented to the patient during a psychophysical vision test, such as visual acuity or perimetry.
read more about target illumination ...In automated perimetry, target illumination is carefully controlled and varied to determine the patient's retinal sensitivity threshold (the minimum light intensity they can detect).
Target illumination is typically measured in apostilbs (asb) or decibels (dB). The luminance of the target is measured relative to the luminance of the surrounding background.
Standardized illumination is critical in clinical testing, as differences in target brightness directly affect the results and prevent comparison between visits or different instruments.
The Goldmann Size III target, which subtends $0.43^\circ$ (or $26$ arcminutes) of visual angle, is the international standard for most common diagnostic visual field tests.
Suprathreshold testing uses a target illumination level that is known to be above the patient's expected detection threshold, making the test faster but less precise.
Yes. The target must be visible against the background. Contrast is the critical parameter, which is the difference between target and background illumination.