The Effect of Blue Blocker Lenses on Contrast Sensitivity and Reading Speed: a Comparison Between Different Wavelengths
DOI:
https://doi.org/10.22399/ijcesen.1340Keywords:
blue light filters, contrast sensitivity, reading speedAbstract
Although blue blocker lenses (BBLs) are specifically designed to reduce the harmful effects of blue light emitted by electronic devices, their effects on visual behavior and color perception have not been fully investigated. Commercially available BBLs selectively attenuate specific visible light wavelengths on the electromagnetic spectrum, thereby influencing the contrast sensitivity of individuals. Blue light is defined as the wavelength range in the electromagnetic spectrum (380-495 nm) and can be classified into two subgroups, blue-violet (380-450 nm) and blue-turquoise (450-495 nm), and has different effects on human physiology. The aim of our study was to investigate the effects of two different BBLs (460 nm and 500 nm) on contrast sensitivity and reading speed, as well as to assess their impact on visual acuity. The results showed that the use of BBLs increased the number of words read per minute, but the reading speed slowed down with increasing age. This may be attributed to the decline in visual acuity with age. Additionally, the use of BBLs was found to increase contrast sensitivity; however, contrast sensitivity decreased in people aged 41 years and older despite the use of BBLs. The results demonstrate that the use of BBLs affects reading speed and contrast sensitivity, and they may be useful information for ophthalmologists and a criteria for prescribing.
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