By Robert F. Hess (auth.), George C. Woo (eds.)
An overseas Symposium on Low imaginative and prescient used to be backed via the Centre for Sight Enhancement of the varsity of Optometry, collage of Waterloo in June 1986, bringing low imaginative and prescient researchers and clinicians jointly from a couple of nations. the original function of the convention is the multi-disciplinary process in the direction of low imaginative and prescient care. a complete of forty four papers have been offered within the 3 day interval through audio system of notice from the fields of optometry, ophthalmology, psychophysics, designated schooling, nursing and imaginative and prescient rehabilitation. The papers care for concerns in diagnostic technological know-how, low imaginative and prescient evaluate and rehabilitation. The lawsuits quantity is perfect for clinicians and imaginative and prescient scientists to replace their figuring out of low imaginative and prescient learn and scientific practice.
Read or Download Low Vision: Principles and Applications Proceedings of the International Symposium on Low Vision, University of Waterloo, June 25–27, 1986 PDF
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Extra info for Low Vision: Principles and Applications Proceedings of the International Symposium on Low Vision, University of Waterloo, June 25–27, 1986
Example text
A pilot study on a normal subject also confirms that the value changes manifest in our subjects (usually of less than 2 Munsell units) cannot account for their alterations of hue perception. In summary, our results suggest that optic nerve disorders are associated with loss of perceived saturation, which can occur for any hue, and that in addition, genuine alterations in perceived hue can occur. These effects are likely to be coupled with selective deficits for the detection of color contrast at threshold.
2 Suprathreshold Study In this part of the study we investigated the color deficits of our subjects at suprathreshold levels. We asked two main questions: firstly, whether the color deficit can be accounted by changes in perceived saturation or whether specific alterations in hue appearance occur, and secondly whether the deficit is selective for specific hues. We used a between-eye matching paradigm with stimuli taken from the Munsell Book of Color (see Methods for details). We used four of our previous nine subjects, and one additional subject, all of whom had one eye considerably more affected than the other, particularly on the Farnsworth-Munsell 100 hue test.
Contrast sensitivity was measured at nine points in both the red/green and blue/yellow ranges for each eye of each subject. Results for the two subjects on both red/green and bluet yellow stitnuli are shown in Fig. 2. Each subject had suffered a unilateral attack of optic neuritis and each of the affected eyes has the lower overall contrast sensitivities. The better eyes of the subjects illustrate the type of function typically found for normal SUbjects at this spatial frequency [9]. Contrast sensitivity is greatest to the monochromatic gratings at either end of each range (0% and 100% red; 0% and 100% yellow).