Measurements of transmission spectrums and estimation of retinal blue-light irradiance values of currently available clear and yellow-tinted intraocular lenses.
Summary of "Measurements of transmission spectrums and estimation of retinal blue-light irradiance values of currently available clear and yellow-tinted intraocular lenses."
PURPOSE:
To compare the spectral transmission characteristics of currently available, foldable, clear and yellow-tinted intraocular lenses (IOLs), and evaluate the protective effects they provide against retinal damage by sunlight.
METHODS:
We measured the spectral transmittance in the wavelength range of 300-800 nm using a spectrophotometer for 63 IOLs including three clear IOLs (N4-18B, Nidek; X-60, Santen; KS-3Ai, Staar Japan) and four yellow-tinted IOLs (N4-18YG, Nidek; NX-60, Santen; KS-AiN, Staar Japan; NM-1, Hoya) with three different lens powers. The blue-light irradiance (BLI) values through the IOLs were calculated as the retinal hazard index for sungazing. The data from three clear IOLs (SA60AT, Alcon Japan; VA-60BBR, Hoya; AU6K, Kowa) and three yellow-tinted IOLs (SN60AT, Alcon Japan; YA-60BBR, Hoya; AU6N, Kowa) reported previously were also discussed.
RESULTS:
Except for the X-60, the clear IOLs completely absorbed ultraviolet (UV) light and nearly completely transmitted 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 than aphakic eyes, and all yellow-tinted IOLs had lower BLI values than phakic eyes. The BLI values of the NX-60, KS-AiN, NM-1, SN60AT and YA-60BBR IOLs decreased with the increase in lens power.
CONCLUSIONS:
Compared to aphakic eyes, currently available UV-blocking clear and yellow-tinted IOLs reduce the BLI values by 43-82%. However, the data presented in this study are not directly applicable to humans implanted with IOLs or for the use of IOLs in a clinical situation, since in those cases the balance between photoprotection and photoreception must be taken into account.
Affiliation
Department of Ophthalmology, Shimane University Faculty of Medicine, Enya 89-1, Izumo, Shimane, 693-8501, Japan, tanito-oph@umin.ac.jp.
Journal Details
This article was published in the following journal.
Name: Japanese journal of ophthalmology
ISSN: 1613-2246
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22094397
- DOI: http://dx.doi.org/10.1007/s10384-011-0100-9
Medical and Biotech [MESH] Definitions
Night Vision
Function of the human eye that is used in dim illumination (scotopic intensities) or at nighttime. Scotopic vision is performed by RETINAL ROD PHOTORECEPTORS with high sensitivity to light and peak absorption wavelength at 507 nm near the blue end of the spectrum.
Phycocyanin
The metal-free blue phycobilin pigment in a conjugated chromoprotein of blue-green algae. It functions as light-absorbing substance together with chlorophylls.
Phototropins
Blue-light receptors that regulate a range of physiological responses in PLANTS. Examples include: PHOTOTROPISM, light-induced stomatal opening, and CHLOROPLAST movements in response to changes in light intensity.
Light Coagulation
The coagulation of tissue by an intense beam of light, including laser (LASER COAGULATION). In the eye it is used in the treatment of retinal detachments, retinal holes, aneurysms, hemorrhages, and malignant and benign neoplasms. (Dictionary of Visual Science, 3d ed)
Fluorophotometry
Measurement of light given off by fluorescein in order to assess the integrity of various ocular barriers. The method is used to investigate the blood-aqueous barrier, blood-retinal barrier, aqueous flow measurements, corneal endothelial permeability, and tear flow dynamics.
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