Download Low Vision: Principles and Applications Proceedings of the by Robert F. Hess (auth.), George C. Woo (eds.) PDF

By Robert F. Hess (auth.), George C. Woo (eds.)

An foreign Symposium on Low imaginative and prescient was once subsidized through the Centre for Sight Enhancement of the college of Optometry, college of Waterloo in June 1986, bringing low imaginative and prescient researchers and clinicians jointly from a few nations. the original characteristic of the convention is the multi-disciplinary method in the direction of low imaginative and prescient care. a complete of forty four papers have been awarded within the 3 day interval by means of audio system of word from the fields of optometry, ophthalmology, psychophysics, precise schooling, nursing and imaginative and prescient rehabilitation. The papers care for concerns in diagnostic technology, low imaginative and prescient evaluation 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.

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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

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JO .. H. t.... , " H \Ill; U "iN. "" D :~: Il'a (... 1 • II H III. '. R u u "Is J'Nihi. I"" Wlt ,... 1 '"" .. tn.... "'" is '" i i " '...... I ll..... ;:: • w • H tiMii .... • Tn • fn • Ii In in M II .. • 1n • in • 1n in 1m........ 6\ h II lit.... • .. , .... -I CMiiI :: .... Iii. tiM • t410I H i t! , II lit'.. ,.. • '" 1n [hllotf '"'" II From previous studies [5-7], it was expected that low vision patients would have limited contrast sensitivity at the standard three meter distance so the patients were also tested at a distance of one meter.

Note that while each patient shown in Fig. 3 has 3/42 (10/140) acuity, there are significant differences in their contrast sensitivity functions, especially between patients MB and RK. Also note that while patient MB, with an overall higher contrast sensitivity function, did well on the reading task, patient RK did poorly. Having higher contrast sensitivity, patient HS also performed better on the reading task than patient RK. 26 EXAMPLES OF CONTRAST SENSITIVITY OF MACULAR DEGENERATION PATIENTS .............

UN IIIIII1 =~~'T",. J o% (/) E UJ a: ...... a: (/) 100 Z 01 % UJ ... a: ~ ~ JO 03 U U SPATIAL FREQUENCY ICYCLES PER DEGREe) Figure 2. Shown here are the means and 90% of the population (based on the 5th and 95th percentile) of the contrast sensitivity functions of the normal population, low vision patients for the most sensitive eye, and those low vision patients with fair to good fluency reading Sloan 1 m Continuous Reading Text Cards using visual aids. At this one meter viewing distance, the average contrast sensitivity of the low vision patient is at least a factor of four less than that of the normal population at all spatial frequencies.

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