Gunnar over-the counter (OTC) computer glasses adopt yellow lenses to cut off the active short wavelength and lessen the bright glare, which often induces the detrimental effect caused by excessive illumination or intense scattered reflection. While the general benefit of glare reduction is well received, the benefit on visual performance has been inconclusive. Some studies reported significant enhancement in contrast sensitivity, but some failed to see any improvement on visual acuity and contrast sensitivity, even with color distortion. Without argument, tinted lenses reduce the transmittance of the visible spectrum and change the visible color to a certain degree. However, there has been report that a reduction of the retinal illumination level does not necessarily lead to reduced brightness; instead, the visual system automatically adjusts for the illumination discounting, possibly with the help of increased pupil size. In addition, with the decrement of blue lights arriving to the eyes, both scattered reflection and chromatic aberration are reduced. Together, it is reasonable to believe that the visual acuity, contrast sensitivity, and chromatic discrimination will not suffer and may, instead, benefit from the filter of yellow lenses. These basic visual functions may, in turn, lead to enhancement in general visual performance such as routine office work. These will be tested in the proposed study.