By J. M. Ordy, T. M. Wengenack, W. P. Dunlap (auth.), Donald Armstrong Ph.D., Dr.Sc., Michael F. Marmor M.D., J. Mark Ordy Ph.D. (eds.)
This e-book derives from a symposium performed in San Francisco CA, entitled "Environmental layout for maximum imaginative and prescient within the aged" that used to be backed by means of the yankee getting older organization, October 11-12, 1985. displays from this symposium include the center content material of this quantity. even if, manuscripts have additionally been permitted from extra authors whose subject matters and study findings bring up the scope and objectives of this quantity. formerly unpublished info is located in numerous of the chapters. additionally new info and references were integrated on the finish of chapters to be able to offer a present replace of the topic. The wide goals of the papers during this quantity have been to envision the consequences of varied environmental components, long term occupational dangers, and pollutants on easy visible features on the subject of physiological, biochemical, morphological, and pathological adjustments within the eye and visible pathways, and facilities of the mind. As a part of the extra particular goals of this quantity, the editors have supplied the next framework for the explicit issues integrated during this quantity: I) Epidemiology, scientific and Psychophysical examine, II) Ophthalmological, Biochemical, Physiological and Anatomical experiences, and III) Environmental Hazards.
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Extra info for The Effects of Aging and Environment on Vision
Example text
Also, the differences between the 25/75, 50/50 and 75/25 light/dark ratios were slightly greater for the peripheral versus central location across all age groups. This means that the dynamic psychophysical receptive field properties were more affected by age centrally than peripherally. Thus, with age, the periphery was shown to be more robust under dynamic conditions. 0 (II ::I ..... 0 ,/ / / LIGHT/DARK RATIO ~~~~~~~~~ 5 - 10 11 - 20 21 - 30 31 - 40 41 - 50 51 - 60 61 -70 71 - 80 81 - 90 AGE Fiq.
The old recognized fewer word trigrams at each lSI than did the young--thus the persistence of the first half appeared to have faded more quickly for the old and was less available to be integrated with the second half, an integration that was necessary to recognize the word formed by the combination. However, just the opposite result was reported by Kline and Orme-Rogers [16] using a modified version of the "stimulus halves" task. These investigators reported that older subjects did much better than the young in identifying the target words when the two halves were separated by ISIs of 60 and 120 msec, suggesting that the iconic persistence of the first half was longer in duration and/or of higher fidelity for the old.
J ~20 z ~ 15 20 50 110 160 TARGET SPEED o/sec 220 Fig. 4. Dynamic Visual Acuity as a function of target velocity in velocity resistant and velocity susceptible individuals among Ensigns and retired Naval aviators. ;1--_----uL -------0 10 O~~~ ____~__________~ 20 50 110 TARGET SPEEDo/sec 220 Fig. 5. The orientation effect in Dynamic Visual Acuity measures. Landolt Cs with the gAp oriented to the right become easiest to resolve and Landolt C gaps oriented down become most difficult to resolve at target velocities of SOo/sec and faster .