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STEREOSCOPIC CONSTANCY SCALING WITH ANISEIKONIC LENSES
Author(s) -
Morrison L. C.,
Fox T. M.
Publication year - 1981
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.1981.tb00150.x
Subject(s) - scaling , tilt (camera) , stereopsis , subjective constancy , mathematics , perspective (graphical) , distortion (music) , stereoscopy , set (abstract data type) , function (biology) , lens (geology) , plane (geometry) , optics , apparent size , mathematical analysis , physics , geometry , computer science , psychology , cognitive psychology , perception , amplifier , optoelectronics , cmos , neuroscience , evolutionary biology , biology , programming language
When objects are viewed with an aniseikonic lens they appear to tilt from a subject's frontal plane and distort in shape, the distortion being attributed to size constancy scaling. A technique was devised which permitted both the amount apparent tilting and of constancy scaling hi be measured. Therefore, the relation between the two tjualitios could be studied. The results failed in confirm the invariance theory assumed by Ogle (1950). i.e. that scaling ii upplied in proportion to the amount of perceived tilting, but were consistent with the direct response theory of Gillam (1967) which assers that perceived tilting and constancy scaling are determined independently. Indeed, the results suggest that, for slanting objects with perspective attributes, the chief function of the stereoscopic cues is to set the constancy scaling and thus stereopsis greatly contributes to the shape constancy of tilted objects.