1. How age affects the speed of perception of computer icons 學生：董瑩蟬

2. Purpose This paper want to investigate the visual search task performance on the different age group. It is contrast between the different icon size and spacing search time.

3. Reference Normal aging of visual system 年份學者結果 2000A.J. Bron et al.The visual ability decreases with age. 1999A. Guirao et al.The eye of modulation transfer function decline with age. 2001A. Glasser et al.There is a declined of Light scatter in the lens, which reduced visual contrast. 2005J.W Page et al.The colour discrimination performance decreases with age. 1993 1996 C.A. Curcio et al. S. pardhan et al. The number of retinal ganglion cells decreases with aging, which decline the transmitted ability, and it has loser contrast sensitivity.

4. Reference Visual search 年份學者結果 1999M.E. Scheck et al.In the dual task, the visual tunnel become narrower with older. 2002E.T. Davis et al.There is a longer of search time in older. 1997 2002 A.T. Weford et al. T.A. Salthouse. et al. The visual perceptual slower with older, and the motor and cognitive has the same result. 2001 2002 N. Charness et al. E.T. Davis et al. The performance can increase with train in older. 2001 N. Charness et al. S.J. Czaja et al. The performance dose not eliminate the effect, even after training.

5. Method 1.Subject 51 person (8M,43F),Five group No eye-disease and visual impaired Have use computer experience 2.Equipment Precision vision Vistech PC Computer SGI 1600SW LCD

6. Method 3. Independent variables Icon sizes Spacing 4.Dependent variables Search time

7. Method 5.Process Measure visual acuity and contrast sensitivity. Two trains. Visual search task. When fined the different icon Click the “icon”, no different or no fined click “no”. When subjects find two errors, this task will finish. 500ms 800ms

8. Results

12. Mean search time for normal size and normal vision for age group GroupMean (ms)S.D 20-2960669892 30-3953024277 40-4946472697 50-591201911593 60-6964364154

13. Results

14. Discussion 年份 年份 學者得到結果本實驗結果 2000T.A. SathouseThe cognitive processing speed slower with aging. The visual search speed increased with aging. 1997N. Walker et al.The older spend more time to chick the mouse cursor. 2003R. Nasanen et al.There is a bad affect in search performance, when reduce the icon contrast.

15. Discussion The older has poor attention resources. (P.A. Reuter-Lorenz 2002) The older adults has less visual field. (G. Haegerstrom-Portony et al.,1999) The useful field of view reduce with aging. (J. Cerella,1985) The visual field become narrower with aging. (J. Cerella,1985; G. Haegerstrom-Portony et al.,1999)

16. Conclusions The search time declined with increase age. The interfere increase with the subnormal vision person, when the small icon and the far spacing. People with subnormal vision has no difference with normal person, when the large icon. The interface design degree about 1 and the spaced must be next to each other.