Ophthalmologic Psychophysical Tests Support OCT Findings in Mild Alzheimer’s Disease

Table 2

Mean data and value of the psychophysical tests.

Test	AD group	Control group	% difference	value
Visual acuity (dec)	0.78 ± 0.19	0.95 ± 0.06	−17.89	0.001
Contrast sensitivity
3 cpds	1.39 ± 0.27	1.62 ± 0.19	−14.61	0.001
6 cpds	1.58 ± 0.24	1.88 ± 0.22	−16.03	0.001
12 cpds	1.12 ± 0.33	1.46 ± 0.20	−23.05	0.001
18 cpds	0.61 ± 0.37	1.11 ± 0.27	−44.57	0.001
Rue 28-hue
Number of errors	7.41 ± 4.69	5.95 ± 4.06	24.54	0.18
Tritan unspecific errors	4.35 ± 2.40	2.52 ± 2.00	72.62	0.009
PDT (sheet)
Successful number of sheets	11.74 ± 2.39	13.79 ± 1.47	−14.87	0.01

Mean value ± SD; , Mann-Whitney test (AD: Alzheimer’s disease; cpds: cycles per degree; PDT: perception digital test).