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Luminance, optical density, and transmittance
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To induce the required differences in retinal illuminance, we reduced the luminance of the perturbed eye’s onscreen image by a scale factor equivalent to the transmittance of a neutral density filter with a particular ocular density. The transmittance is given by
where is the optical density of the filter. We have previously verified that this procedure—using ‘virtual’ neutral density filters—yields results that are equivalent to using real neutral density filters5.
Copyright and License information: The Author(s) ©2020
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