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
Neuroophthalmology from the Perspective of anAnterior Segment Surgeon
Gerhard K. Lang
Department of OphthalmologyUniversity of Ulm
Eye -and Brain - Entertainment
„Do not trust your eyes!“
REM
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
Ambiguous pictures
Reversible goblet – Edgar J. Rubin
Reversible goblet – Edgar J. Rubin
Ambiguous pictures
Effect: rival-schemata ambiguity
Rabbit and Duck
Ambiguous pictures
Effect: rival-schemata ambiguity
Effect: rival-schemata ambiguity
Effect: rival-schemata ambiguity
Sigmund Freud, Neurologist, 1856-1939
Kanisza figure (Gaetano Kanisza)
Effect: subjective or illusory contours
Congnitive- / Gestalt Field
Effect: subjective or illusory contours
Effect: subjective or illusory contours
Size Illusions
Original: Müller-Lyer Illusion
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.
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.
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
Petersdom, Fassade von C. Maderno 1607-1612
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. EscherMaurits Cornelius Escher, Niederlande 1898-1972The magic mirror of M.C. Escher
Effect: Impossible objects
BelvédèreM.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“
Furitsu (2002) photoshop contestWorth1000.com Effect: „one shot learning“
Dallenbach`s figure
Dallenbach`s figure
Dallenbach`s figure
Adelson`s „Checker-shadow illusion“
Adelson EH (1993)Perceptual organization andthe judgment of brightness.Science 262:2042-2044
Luminance & Contrast
Hermann Grid Illusion Luminance & Contrast
Hermann L (1870) Eine Erscheinung simultanen Contrastes. Pflügers Archiv für die gesamte Physiologie 3:13–15
Scintillating Grid
Schrauf M, Lingelbach B, Wist E.(1997) The scintillating grid illusion. Vision Res 37:1033-1038
Luminance & Contrast
Rotating Snake Illusion
Kitaoka A, Ashida H (2003) Phenomenal characteristics of the peripheral drift illusion.VISION 15:261-262
Effect: Illusory motion
Enigma
This image „The Enigma“ is by Isia Leviant (1984)
Effect: Illusory visual motion
final test
10 seconds concentration
Where is the giraffe ?
Department of Ophthalmology
Thank you for your
attention !
City Center of Ulm
World Ophthalmology Congress6 –10 June 2010Berlin Germany
www.woc2010.de