neuroophthalmology from the perspective of an anterior segment surgeon gerhard k. lang department of...
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Neuroophthalmology from the Perspective of anAnterior Segment Surgeon
Gerhard K. Lang
Department of OphthalmologyUniversity of Ulm
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Neuroophthalmology from the Perspective of anAnterior Segment Surgeon
Gerhard K. Lang
Department of OphthalmologyUniversity of Ulm
![Page 3: Neuroophthalmology from the Perspective of an Anterior Segment Surgeon Gerhard K. Lang Department of Ophthalmology University of Ulm](https://reader035.vdocuments.mx/reader035/viewer/2022062518/56649c9a5503460f949583e6/html5/thumbnails/3.jpg)
Eye -and Brain - Entertainment
„Do not trust your eyes!“
REM
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Optical Illusions and
visual Phenomena:
Illusion and Reality
Salvadore Dali 1904-89
Gala looking into the Mediterranean Sea
Effect:“Lincoln Illusion“ („block masking“) Harmon LD & Julesz B (1973). Masking in visual recognition: Effects of two-dimensional filtered noise. Science 180:1194–1197
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Ambiguous pictures
Reversible goblet – Edgar J. Rubin
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Reversible goblet – Edgar J. Rubin
Ambiguous pictures
Effect: rival-schemata ambiguity
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Rabbit and Duck
Ambiguous pictures
Effect: rival-schemata ambiguity
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Effect: rival-schemata ambiguity
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Effect: rival-schemata ambiguity
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Sigmund Freud, Neurologist, 1856-1939
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Kanisza figure (Gaetano Kanisza)
Effect: subjective or illusory contours
Congnitive- / Gestalt Field
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Effect: subjective or illusory contours
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Effect: subjective or illusory contours
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Size Illusions
Original: Müller-Lyer Illusion
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St Michael's Hill, Bristol, England
Effect: „Bristol Café wall Illusion“
This illusion demonstrates the effect of some simple image processing occurring at the retina combined with some complex processing in the cortical cells of the striate cortex.
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Geometric- & Angle Illusion
Gregory RL & Heard P (1979) Border locking and the Café Wall illusion. Perception 8:365–380
The apparent tilt of the mortar linesis caused by orientation-sensitive simple cells in the striate cortex.
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The cushion Illusion
This drawing consists solely of rectangles and squares, set straight and true; the curvature is all in your mind.
Akiyoshi Kitaoka 1998
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Petersdom, Fassade von C. Maderno 1607-1612
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Fraser`s Spiral („Twisted Cord Illusion“)
Fraser J (1908) A New Visual Illusion of Direction.Brit J Psych 2:307-320
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Drawing hands, Tekenen – M.C. EscherMaurits Cornelius Escher, Niederlande 1898-1972The magic mirror of M.C. Escher
Effect: Impossible objects
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BelvédèreM.C. Escher 1958
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The Pool
David MacDonald
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The Terrace
David MacDonald
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Pergola, Istvan Orosz, Hungary 1951
www.utiz.net
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Hidden Images
Worth1000.com
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„The Face in the Beans“
Furitsu (2002) photoshop contestWorth1000.com Effect: „one shot learning“
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Dallenbach`s figure
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Dallenbach`s figure
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Dallenbach`s figure
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Adelson`s „Checker-shadow illusion“
Adelson EH (1993)Perceptual organization andthe judgment of brightness.Science 262:2042-2044
Luminance & Contrast
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Hermann Grid Illusion Luminance & Contrast
Hermann L (1870) Eine Erscheinung simultanen Contrastes. Pflügers Archiv für die gesamte Physiologie 3:13–15
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Scintillating Grid
Schrauf M, Lingelbach B, Wist E.(1997) The scintillating grid illusion. Vision Res 37:1033-1038
Luminance & Contrast
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Rotating Snake Illusion
Kitaoka A, Ashida H (2003) Phenomenal characteristics of the peripheral drift illusion.VISION 15:261-262
Effect: Illusory motion
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Enigma
This image „The Enigma“ is by Isia Leviant (1984)
Effect: Illusory visual motion
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final test
10 seconds concentration
Where is the giraffe ?
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Department of Ophthalmology
Thank you for your
attention !
City Center of Ulm
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World Ophthalmology Congress6 –10 June 2010Berlin Germany
www.woc2010.de