Saccadic eye movements as a measure of the effect of low vision rehabilitation on reading rate.
We assessed saccadic eye movements and reading capabilities in individuals with macular disease by a masked clinical study to determine whether changes in saccadic frequency were correlated to changes in reading rates or number of errors for a reading task. We used a measure of eye movement characteristics in the form of a saccadic frequency score (SFS). Twelve subjects with macular disease were tested before and after an intense 6-week inpatient vision rehabilitation program. The mean age was 70.9 years (63 to 77 years). Mean visual acuity was 10/100 (10/40 to 10/200). Mean reading rates at entry and discharge were 8.5 words/min and 20.9 words/min, respectively (p = 0.02). SFS improved from 2.709 to 2.022 (p = 0.07). Reading errors improved from 5.60 to 4.00 (p = 0.03). Reading rates and SFS's were highly inversely correlated both pre- and post-treatment (Pearson r = -0.892 and -0.896, respectively). SFS and the number of reading errors were highly correlated with both pre- and post-treatment as well (Pearson r = 0.782 and 0.601, respectively). Interestingly the data appeared to cluster into two groups, one showing improvement and the other showing none. Cluster analysis revealed a strong association among reading rate, saccade scores, and reading errors. Membership in the two clusters is consistent pre- and post-rehabilitation in all but one case. Clustering is most evident for reading rate and reading errors and less so for saccade scores.(ABSTRACT TRUNCATED AT 250 WORDS)
McMahon
T T
TT
Department of Ophthalmology and Visual Sciences, University of Illinois, College of Medicine, Chicago.
Hansen
M
M
Stelmack
J
J
Oliver
P
P
Viana
M A
MA
D000368:Aged; D005133:Eye Movements; D006801:Humans; D008268:Macular Degeneration / Q000150:complications / Q000534:rehabilitation; D008297:Male; D008875:Middle Aged; D011932:Reading; D012438:Saccades / Q000502:physiology*; D015354:Vision, Low / Q000209:etiology / Q000534:rehabilitation*; D014792:Visual Acuity