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J Cataract Refract Surg. 2010 Feb;36(2):299-307. doi: 10.1016/j.jcrs.2009.08.036.

Transmission spectrums and retinal blue-light irradiance values of untinted and yellow-tinted intraocular lenses.

Author information

1
Department of Ophthalmology, Shimane University, Enya 89-1, Izumo, Shimane, 693-8501, Japan. tanito-oph@umin.ac.jp

Abstract

PURPOSE:

To record and compare the spectral transmission characteristics of foldable untinted and yellow-tinted intraocular lenses (IOLs) and evaluate the protective effects against retinal damage by sunlight.

SETTING:

Shimane University Faculty of Medicine, Izumo, Japan.

METHODS:

The study evaluated 3 untinted IOLs (SA60AT, VA-60BBR, AU6 K) and 3 yellow-tinted IOLs (SN60AT, YA-60BBR, AU6 N) of 3 lens powers (+10.0 diopters [D], +20.0 D, and +30.0 D). Spectral transmittance in the wavelength range of 300 to 800 nm was measured using a spectrophotometer through 2.5 mm and 4.5 mm diameter apertures. Retinal hazard indices, including blue-light irradiance and maximum permissible exposure duration per day (t(max)) for viewing sunlight, were calculated.

RESULTS:

The untinted IOLs completely absorbed ultraviolet (UV) light and nearly completely absorbed transmitted visible light at wavelengths longer than 440 nm. Yellow-tinted IOLs absorbed more in the blue-light range (400 to 500 nm) than untinted IOLs. The blue-light irradiance was 34.2% to 56.0% lower with the SN60AT IOL than with the SA60AT IOL, 35.2% to 48.4% lower with the YA-60BBR IOL than with the VA-60BBR IOL, and 16.8% to 22.9% lower with the AU6 N IOL than with the AU6 K IOL. Blue-light irradiance values of SN60AT and YA-60BBR IOLs decreased as the lens power increased.

CONCLUSIONS:

Compared with aphakic eyes, UV-blocking untinted IOLs reduced the blue-light irradiance value by 60%; yellow-tinted IOLs conferred an additional 17% to 56% reduction. The difference in lens power was significantly related to the blue-light irradiance value of some yellow-tinted IOLs. .

PMID:
20152614
DOI:
10.1016/j.jcrs.2009.08.036
[Indexed for MEDLINE]
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