Share Email Print
cover

Proceedings Paper

Accurate method for luminous transmittance and signal detection quotients measurements in sunglasses lenses
Author(s): A. D. Loureiro; L. Ventura
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

The international standard ISO 12312-1 proposes transmittance tests that quantify how dark sunglasses lenses are and whether or not they are suitable for driving. To perform these tests a spectrometer is required. In this study, we present and analyze an accurate alternative method for performing these measurements using simple components. Using three LEDs and a four-channel sensor we generated weighting functions similar to the standard ones for luminous and traffic light transmittances. From 89 sunglasses lens spectroscopy data, we calculated luminous transmittance and signal detection quotients using our obtained weighting functions and the standard ones. Mean-difference Tukey plots were used to compare the results. All tested sunglasses lenses were classified in the right category and correctly as suitable or not for driving. The greatest absolute errors for luminous transmittance and red, yellow, green and blue signal detection quotients were 0.15%, 0.17, 0.06, 0.04 and 0.18, respectively. This method will be used in a device capable to perform transmittance tests (visible, traffic lights and ultraviolet (UV)) according to the standard. It is important to measure rightly luminous transmittance and relative visual attenuation quotients to report correctly whether or not sunglasses are suitable for driving. Moreover, standard UV requirements depend on luminous transmittance.

Paper Details

Date Published:
PDF
Proc. SPIE 10045, Ophthalmic Technologies XXVII, 100451P; doi: 10.1117/12.2251639
Show Author Affiliations
A. D. Loureiro, Univ. de São Paulo (Brazil)
L. Ventura, Univ. de São Paulo (Brazil)


Published in SPIE Proceedings Vol. 10045:
Ophthalmic Technologies XXVII
Fabrice Manns; Per G. Söderberg; Arthur Ho, Editor(s)

© SPIE. Terms of Use
Back to Top