in partial fulfil]ment of the - MSpace - University of Manitoba

86
Test times of adult subjects
Test
TÀBIE 20
for 5 days in the Rapid Dark Àdaptation
(thornton , 1977),
Subj ec t
Day I
Test times (in seconds)
Day Iï Day iII Day IV Day V
Mean of
5 days
1
284
210
205
175
173
209.6
2
432
253
249
255
236
285.2
3
258
193
164
161
163
188.0
4
290
228
238
235
232
244.9
5
273
235
180
162
159
202.0
Mean of
5 Subjects 307.6 224.1 207.6 197 .'1 192.7 226!65
Test was 3.031'1.00 and 4.41!0.83 minutes in the 20-39 and 40-60 year old
groups, respectively. The nean test time for healthy subjects (3.03
minutes) which was more or less similar to the mean test time in the
current study ß.76 minutes). The sright variation in test times
observed between the sutdy by Vinton and Russell (1981) and the current
study could be explained by inter-subject variability. À significant
(p.0.0001) inter-subject variability was also observed in the current
study. The fact that lhe test objects (colored discs) used in the two
sludies were different could also have contributed to the difference in
lest times between the two studies. In the study reported by Vinton and
Russell (1981), Munsell col-or discs were used, where as in the current
study ÀS0 (Àdvanced Soft Optics) discs were used. The physical characteristics
of the AS0 discs, such as reflective surfaces of the discs and