Abstract
Additivity of the Stiles-Crawford effect over pupil area was examined for a Fraunhofer image focused on the retina. Two hypotheses were compared: (1) the Stiles-Crawford effect is absent under these conditions because the wavefronts are flat near focus: and (2) the Stiles-Crawford effect is additive for all positions of focus. Consideration of wave-superposition principles along with dielectric waveguide theory leads to the prediction of additivity. Additivity was tested indirectly by comparing increment thresholds for focused and defocused test flashes viewed through an annular pupil, and directly by comparing thresholds for focused test flashes viewed through the annulus to those viewed through (1) a small, centered, circular pupil and (2) a small section of the annulus. Additivity was found to hold precisely for all conditions: the nonadditivity hypothesis was rejected.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
