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Journal of Biomedical Optics

Measuring ultraviolet-visible light transmission of intraocular lenses: double-beam mode versus integrating-sphere mode
Author(s): Ali Akinay; Marcia D. Ong; Myoung Choi; Mutlu Karakelle
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Paper Abstract

This study compared integrating-sphere and double-beam methodologies for measuring the ultraviolet/visible transmission of intraocular lenses (IOLs). Transmission spectra of control IOLs and clinically explanted IOLs were measured with an optical spectrophotometer in two optical configurations: single-beam mode with integrating sphere detector and double-beam mode with photodiode detector. Effects of temperature and surface light scattering on transmittance were measured. Effects of lens power were measured and were modeled with ray-tracing software. Results indicated that transmission was consistent over a range of IOL powers when measured with the integrating-sphere configuration, but transmission gradually decreased with increasing IOL power (in a wavelength-dependent fashion) when measured with the double-beam configuration. Ray tracing indicated that the power-dependent loss in transmission was partially due to higher-powered IOLs spreading the light beam outside of the detector area. IOLs with surface light scattering had transmission spectra that differed between double-beam and integrating-sphere configurations in a power-dependent fashion. Temperature (ambient or physiological 35°C) did not affect transmission in the integrating-sphere configuration. Overall, results indicated that double-beam spectrophotometers may be useful for measuring transmittance of low-power IOLs, but an integrating-sphere configuration should be used to obtain accurate measurements of transmittance of higher-power IOLs.

Paper Details

Date Published: 1 October 2012
PDF: 7 pages
J. Biomed. Opt. 17(10) 105001 doi: 10.1117/1.JBO.17.10.105001
Published in: Journal of Biomedical Optics Volume 17, Issue 10
Show Author Affiliations
Ali Akinay, Alcon Labs., Inc. (United States)
Marcia D. Ong, Alcon Labs., Inc. (United States)
Myoung Choi, Alcon Labs., Inc. (United States)
Mutlu Karakelle, Alcon Labs., Inc. (United States)

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