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  • 1
    Electronic Resource
    Electronic Resource
    Abnormal orientation selectivity in both eyes of strabismic amblyopes (1979)
    Springer
    Experimental brain research 37 (1979), S. 187-191 
    Details
    ISSN: 1432-1106
    Keywords: Amblyopia ; Grating adaptation ; Orientation selectivity ; Visual acuity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In normal observers preadaptation to a parallel grating increases the contrast threshold for a line whereas a perpendicular grating has no effect. Such orientation selectivity was not found in the amblyopic eye of two out of five squinters. Only a weak after-effect produced with a grating parallel to the line was obtained in the good eye of four of the amblyopes while all of them show an abnormal threshold reduction following adaptation to a perpendicular grating. This suggests a relationship between abnormal binocular interaction during visual development and the organization of orientational mechanisms but does not explain the loss of visual acuity in amblyopia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01474265
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Amblyopic processing of positional information. Part I: Vernier acuity (1985)
    Springer
    Experimental brain research 60 (1985), S. 270-278 
    Details
    ISSN: 1432-1106
    Keywords: Amblyopia ; Vernier acuity ; Positional information ; Visual plasticity ; Alteration of perception
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Psychometric functions for the recognition of vernier displacements have been measured in 6 strabismic amblyopes, 1 anisometropic amblyope, and 1 bilateral amblyope of unknown aetiology. In the non-amblyopic eyes of the 7 unilateral amblyopes the mean threshold vernier offset was about half of that of a group of 7 experienced normal observers. No correlation was found between vernier acuities and Snellen acuities in the abnormal eyes of squinters. These eyes also displayed massive distortions of horizontal spatial values causing perceptual distortions. In all but one of the amblyopic eyes tested hyperacuity virtually disappeared at the brief exposure duration of 50 ms. None of the observed effects could be predicted from the amblyopic contrast sensitivities, grating resolutions, or letter acuities. This suggests that the loss of positional information is an independent and most significant feature of amblyopic visual dysfunction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235921
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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