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M. Tanito, T. Okuno, Y. Ishiba, A. Ohira; Estimation for Protective Effects of Clear and Yellow-Tinted Intraocular Lenses Against Sunlight-Induced Retinal Damage. Invest. Ophthalmol. Vis. Sci. 2010;51(13):5738.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate the protective effects of currently available, foldable, clear, and yellow-tinted intraocular lenses (IOLs) against possible retinal damage by sunlight.
Fifty-four IOLs including three clear IOLs (SA60AT, Alcon; VA-60BBR, Hoya; and AU6K, Kowa) and three yellow-tinted IOLs (SN60AT, YA-60BBR, and AU6N) with three different lens powers (+10, +20, and +30 diopters). The spectral transmittance in the wavelength range of 300 to 800 nm was measured using a spectrophotometer through 2.5 and 4.5-mm diameter apertures, and the retinal hazard indexes including blue-light irradiance (BLI) and maximum permissible exposure duration per day (Tmax) for viewing the sunlight were calculated.
The clear IOLs completely absorbed the ultraviolet (UV) light and nearly completely transmitted the visible light at wavelengths longer than 440 nm. Yellow-tinted IOLs absorbed more in the blue-light range (400-500 nm) than clear IOLs. All IOLs had lower BLI values and longer Tmax values compared to aphakic eyes (15.00 mW/cm2 and 0.67 second, respectively), and all yellow-tinted IOLs had lower BLI values (2.68-4.55 mW/cm2) and longer Tmax values (2.20-3.73 seconds) compared to phakic eyes (5.76 mW/cm2 and 1.73 seconds, respectively). When comparing the BLI values of the clear and yellow-tinted IOLs, the BLI of the SN60AT IOL was 34.2% to 56.0% lower than that of the SA60AT IOL, the BLI of the YA-60BBR IOL was 35.2% to 48.4% lower than that of the VA-60BBR IOL, and the BLI of the AU6N IOL was 16.8% to 22.9% of the AU6K IOL. The BLI values of the SN60AT and YA-60BBR IOLs decreased as the lens power increased. When the two aperture diameters were tested, the BLI values generally did not differ between the measurements.
Compared to aphakic eyes, UV-blocking clear IOLs reduce the BLI value by 60% and the yellow-tinted IOLs confer an additional 17% to 56% reduction in the BLI. The difference in the lens power is significantly related to the BLI value in some yellow-tinted IOLs.
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