caa a22 4500 465794734 CHVBK 20180323112034.0 cr unu---uuuuu 170327e19900901xx s 000 0 eng 10.1007/BF00146550 doi (NATIONALLICENCE)springer-10.1007/BF00146550 Objective measurement of contrast sensitivity using the steady-state visual evoked potential [Elektronische Daten] [Shuai Chen, Lezheng Wu, Dezheng Wu] Contrast sensitivity functions (CSFs) were determined electrophysiologically with the steady-state visual evoked potential (VEP). Psychophysical CSFs obtained by the method of increasing contrasts were also measured concurrently with the VEP trials. The VEP contrast thresholds were obtained using a rapid recording technique in which the contrast of a counterphase sinewave modulated at a temporal frequency of 7.5 Hz was swept from 0.5% to 40% over a period of 22 s in 39 equal logarithmic steps. For this pattern reversal stimulus, the amplitude and phase of the second harmonic response as a function of contrast were measured using a discrete Fourier transform (DFT). Contrast sensitivities at five spatial frequencies ranging from 0.5 to 14.9 cpd were measured. The VEP contrast thresholds were determined by a linear extrapolation to zero amplitude. The contrast threshold obtained by the two methods correlated at 0.816 for 14 subjects. For all five spatial frequencies there were no significant differences between the contrast sensitivities derived from the two methods. Kluwer Academic Publishers, 1990 Contrast sensitivity nationallicence discrete Fourier transform nationallicence visual evoked potentials nationallicence Chen Shuai Zhongshan Ophthalmic Center, Sun Yat-sen University of Medical Sciences, Guangzhou, People's Republic of China aut Wu Lezheng Zhongshan Ophthalmic Center, Sun Yat-sen University of Medical Sciences, Guangzhou, People's Republic of China aut Wu Dezheng Zhongshan Ophthalmic Center, Sun Yat-sen University of Medical Sciences, Guangzhou, People's Republic of China aut Documenta Ophthalmologica Kluwer Academic Publishers 75/2(1990-09-01), 145-153 0012-4486 75:2<145 1990 75 10633 https://doi.org/10.1007/BF00146550 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00146550 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chen Shuai Zhongshan Ophthalmic Center, Sun Yat-sen University of Medical Sciences, Guangzhou, People's Republic of China aut NATIONALLICENCE 700 1- Wu Lezheng Zhongshan Ophthalmic Center, Sun Yat-sen University of Medical Sciences, Guangzhou, People's Republic of China aut NATIONALLICENCE 700 1- Wu Dezheng Zhongshan Ophthalmic Center, Sun Yat-sen University of Medical Sciences, Guangzhou, People's Republic of China aut NATIONALLICENCE 773 0- Documenta Ophthalmologica Kluwer Academic Publishers 75/2(1990-09-01), 145-153 0012-4486 75:2<145 1990 75 10633 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer