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Neuroophthalmology from the Perspective of an Anterior Segment Surgeon. Gerhard K. Lang Department of Ophthalmology University of Ulm. Neuroophthalmology from the Perspective of an Anterior Segment Surgeon. Gerhard K. Lang Department of Ophthalmology University of Ulm.
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Neuroophthalmology from the Perspective of an Anterior Segment Surgeon Gerhard K. Lang Department of Ophthalmology University of Ulm
Neuroophthalmology from the Perspective of an Anterior Segment Surgeon Gerhard K. Lang Department of Ophthalmology University of Ulm
„Do not trust your eyes!“ Eye - and Brain - Entertainment REM
Harmon LD & Julesz B (1973). Masking in visual recognition: Effects of two-dimensional filtered noise. Science 180:1194–1197 Optical Illusions and visual Phenomena: Illusion and Reality Gala looking into the Mediterranean Sea Salvadore Dali 1904-89 Effect:“Lincoln Illusion“ („block masking“)
Ambiguous pictures Reversible goblet – Edgar J. Rubin
Ambiguous pictures Effect: rival-schemata ambiguity Reversible goblet – Edgar J. Rubin
Ambiguous pictures Effect: rival-schemata ambiguity Rabbit and Duck
Kanisza figure (Gaetano Kanisza) Congnitive- / Gestalt Field Effect: subjective or illusory contours
Size Illusions Original: Müller-Lyer Illusion
St Michael's Hill, Bristol, England 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. Effect: „Bristol Café wall Illusion“
Gregory RL & Heard P (1979) Border locking and the Café Wall illusion. Perception 8:365–380 Geometric- & Angle Illusion The apparent tilt of the mortar lines is caused by orientation-sensitive simple cells in the striate cortex.
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
Fraser`s Spiral („Twisted Cord Illusion“) Fraser J (1908) A New Visual Illusion of Direction. Brit J Psych 2:307-320
Drawing hands, Tekenen – M.C. Escher Maurits Cornelius Escher, Niederlande 1898-1972 The magic mirror of M.C. Escher Effect: Impossible objects
Belvédère M.C. Escher 1958
The Pool David MacDonald
The Terrace David MacDonald
Pergola, Istvan Orosz, Hungary 1951 www.utiz.net
Hidden Images Worth1000.com
„The Face in the Beans“ Effect: „one shot learning“ Furitsu (2002) photoshop contest Worth1000.com
Luminance & Contrast Adelson`s „Checker-shadow illusion“ Adelson EH (1993) Perceptual organization and the judgment of brightness.Science 262:2042-2044
Luminance & Contrast Hermann L (1870) Eine Erscheinung simultanen Contrastes. Pflügers Archiv für die gesamte Physiologie 3:13–15 Hermann Grid Illusion
Luminance & Contrast Scintillating Grid Schrauf M, Lingelbach B, Wist E.(1997) The scintillating grid illusion. Vision Res 37:1033-1038
Rotating Snake Illusion Effect: Illusory motion Kitaoka A, Ashida H (2003) Phenomenal characteristics of the peripheral drift illusion. VISION 15:261-262
Effect: Illusory visual motion Enigma This image „The Enigma“ is by Isia Leviant (1984)
final test 10 seconds concentration Where is the giraffe ?
Thank you for your attention ! City Center of Ulm Department of Ophthalmology
World Ophthalmology Congress 6 –10 June 2010 Berlin Germany www.woc2010.de