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RESEARCH PRODUCT
Effect of luminance on photopic visual acuity in the presence of laser speckle
José M. ArtigasA. Felipesubject
AdultMaleMasking (art)Visual acuityLightgenetic structuresmedia_common.quotation_subjectVisual AcuityLuminanceSpeckle patternOpticsmedicineHumansContrast (vision)media_commonPhysicsbusiness.industryLasersAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsFemaleComputer Vision and Pattern RecognitionSpeckle imagingSpatial frequencymedicine.symptombusinessPhotopic visiondescription
Visual acuity in coherent and incoherent light has been determined by using square-wave gratings of 100% contrast. Luminance was varied from 3 to 400 cd/m2. Coherent illumination resulted in a 40% loss of visual acuity. This is probably due to the masking effect of coherent spatial noise (speckle). However, the most interesting finding is the change in shape of the photopic visual-acuity-luminance function. With coherent illumination, the function is vertically displaced and of a different gradient. An increase in luminance produces a decrease in visual acuity. This indicates that the masking effect of the speckle is dependent on luminance. Two observers were used, and similar results were obtained by both.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1988-10-01 | Journal of the Optical Society of America A |