[visionlist] You are invited! Please join us for the OSA Virtual Vision Science Seminars

Vyas vyas.phy at gmail.com
Wed Jan 27 13:23:05 -04 2021

Dear Colleagues,

Happy New Year!

Please join the OSA Vision Technical Group for a virtual seminar featuring
presentations from Larry Thibos, Professor Emeritus, School of Optometry at
Indiana University, and Michael Bach, Professor Emeritus and Former Head
Visual Function, Eye Center at University Medical Center Freiburg. More
information about the talks can be found here

*Date and time:* 28 January 2021, 12:00 - 13:30 Eastern Time

*Register here:*

*Imaging in our brain – Optical illusions neither “trick the eye” nor “fool
the brain” presented by Michael Bach:*
Our vision appears to us totally effortless, yet the perception of images,
objects, color, and motion involves complicated, ill-understood processes
in our brain. We usually assume that what we see is what our eyes have seen
and then have transmitted to the brain. Rather, our visual system
continuously “invents” an inner world as a basis for understanding and
planning, based on incomplete information. This rests on experience, both
evolutionary and individually; more formally this is the Bayesian
interpretation of perception. When experience does not fit the current
situation, ensuing missteps of our perceptual apparatus are called “optical
illusions” and can reveal some of these endogenous mechanisms. Thus,
optical illusions neither "trick the eye" nor "fool the brain". The talk
will interactively present demonstrations of these processes, organized
along with the visual dimension luminance, color, motion, space, and

*Starbursts: their nature, origin, and visual importance presented by Larry

Starbursts, an entoptic phenomenon that has been observed and recorded
throughout history, are dim lines that appear to radiate from stars and
planets when viewed against the night sky. Psychophysical experiments,
combined with optical analysis, indicate that starbursts are the subjective
manifestation of light caustics formed on the retina by the eye's optical
aberrations. Starbursts have special relevance to visual astronomy because
they reduce the visibility of celestial objects and hamper the spatial
resolution of neighboring objects (e.g., the recent conjunction of Jupiter
and Saturn).

Please contact Vyas Akondi (vakondi at stanford.edu), Chair of the OSA Vision
Technical Group, if you have any questions.

Vyas Akondi, PhD

Chair, OSA Vision Technical Group

Senior Research Scientist

Stanford University
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