Visual Fields Measured with SWAP(Short Wavelength Automated Perimetry) in Normal Korean

ABSTRACT

PURPOSE: Previous results from many studies indicate that SWAP(short wavelength automated perimetry) is superior to standard white-on-white perimetry for assessing early glaucomatous visual field defects and progression in glaucomatous field loss. The standard normal data of SWAP in Humphrey field analyzer were gathered from normal North American. Therefore, it was necessary to evaluate the visual fields measured with SWAP in normal Korean. METHODS: Central 30-2 threshold tests with blue-on-yellow mode were performed in 96 eyes of 48 normal subjects with Humphrey Field Analyzer. RESULTS: The average value of foveal threshold, mean deviation(MD), pattern standard deviation(PSD), short-term fluctuation(SF), and corrected pattern standard deviation(CPSD) were 22.1+/-4.2 dB, -5.37+/-3.27dB, 3.29+/-0.94 dB, 1.90+/-0.67 dB, 2.48+/-1.15dB, respectively. The frequency of abnormal value on SWAP(p<0.5%) was 29.2% in foveal threshold and 11.5% in MD, which was higher than fundamental data of perimetry. As the age increased, foveal threshold decreased(r=-0.365), PSD and CPSD increased(r=0.321 and 0.283, respectively)(p<0.05). CONCLUSIONS: This study is limited due to the small study group and because the test was performed on single session. Further study is needed for understanding the relationship between SWAP and early structural change of optic nerve and retinal nerve fiber layer.