Abstract
Laser speckle stimuli were used to examine the contribution of the central retina to the visual evoked response (VER). The foveally fixated test stimuli were either small circular spots or annular targets with dark centers. The speckle elements were shifted seven times per second. Reliable responses could be recorded for even the smallest (1 degree) target size. In addition, it was clearly evident that for spots up to 5 degree in diameter, VER amplitude increased linearly with stimulus area. However, data from annular targets revealed that this result was not strictly dependent upon stimulus area. In many instances, large annular stimuli evoked responses with smaller amplitude than spot stimuli with less area. This result may be due to a center-surround antagonistic interaction. These experiments suggest a potential value for laser speckle VER techniques in the assessment of discrete lesions of the macula.
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 callMore From: American journal of optometry and physiological optics
Disclaimer: 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.
