Simplified estimation of the eye’s response to flashing light-emitting diodes

Adam T. Roberts; Stephanie K. Medley; Don A. Gregory; Nilesh B. Dhote

doi:10.1117/1.JBO.20.6.065005

19 June 2015 Simplified estimation of the eye’s response to flashing light-emitting diodes

Adam T. Roberts, Stephanie K. Medley, Don A. Gregory, Nilesh B. Dhote

Author Affiliations +

Journal of Biomedical Optics, Vol. 20, Issue 6, 065005 (June 2015). https://doi.org/10.1117/1.JBO.20.6.065005

Abstract

A useful laboratory technique has been devised using commonly available optical hardware and software to accurately measure the eye’s response to flashing light-emitting diode (LED) sources. A simplified version of the modified Allard technique is implemented using a silicon detector, a digital multimeter, and Labview® software to collect and analyze the data. Using calibrated radiometric measurements, the method presented allows quantifying, in photopic units, the human eye’s response to these sources. The procedure first requires exact conversion of irradiance measurements from radiometric to photopic units and this is done; however, during the study, it was determined that for LEDs with narrow spectra, this conversion can be simplified using an approximation. This involves taking the spectral form of the LED to be a delta function situated at its peak wavelength, which makes the conversion from watts to lumens a simple multiplication by the luminous efficiency, η(λ) value at that peak wavelength. For LEDs with a full width at half maximum of 20 nm or less, this approximation is found to be accurate to ±5% throughout the visible range.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

Citation Download Citation

Adam T. Roberts, Stephanie K. Medley, Don A. Gregory, and Nilesh B. Dhote "Simplified estimation of the eye’s response to flashing light-emitting diodes," Journal of Biomedical Optics 20(6), 065005 (19 June 2015). https://doi.org/10.1117/1.JBO.20.6.065005

Published: 19 June 2015

ACCESS THE FULL ARTICLE

JOURNAL ARTICLE
5 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY