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Purpose  To compare quantitative visual tests, such as visual acuity, contrast sensitivity, and color vision tests in patients with primary open-angle glaucoma (POAG) patients according to three different light systems with different color-rendering index (CRI).    Methods  This was a cross-sectional study of 36 eyes in 36 patients with POAG. Three different light systems consisting of a 3-band fluorescent lamp (CRI 80), a white LED (CRI 75), and a quantum dot LED (CRI > 95) were used. All lights had the same illuminance of 230 lx to exclude illuminance effects. The visual testing included best-corrected visual acuity (BCVA) using an ETDRS chart, a CSV-1000E contrast test, and a color test performed by the Farnsworth Munsell 100-hue test.    Results  There was no significant difference in BCVA ( p  = 0.86). There were no significant differences in the detail contrast tests according to the three light systems ( p  = 0.95,  p  = 0.94,  p  = 0.94, respectively,  p  = 0.64). There was significant difference between the three light systems in color test ( p  = 0.042). The color test scores with a quantum dot LED were significantly lower than those of the  white LED and 3-band fluorescent lamp (p = 0.03 and 0.047, respectively).Conclusions  POAG patients did not show significant differences in visual acuity scores and contrast test scores, expressed as black and white symbols, according to the different light systems. However, POAG patients tested under a quantum dot LED (CRI > 95) could distinguish color differences better than in the other light systems.

Quantitative visual tests in primary open-angle glaucoma patients according to three different lights with different color-rendering index