Abstract
Two experimental configurations, an imaging system and a confocal system,
are constructed to measure the spectral reflectance
of human irises in vivo. The light
from a white light-emitting diode (LED) is focused on the iris and the reflected
light is measured by a spectrometer. A flat plate coated with barium sulphate
$({{Ba}}_{2}{{SO}}_{4})$
with reflectance 0.99 for visible light is used as a reference
to calibrate the system. Samples of gray-blue and black-brown eyes are measured
to compare the performance of the two systems. The differences between the
reflectance spectra of the two systems show that Fresnel reflection from the
interface between air and cornea is the dominating effect. The spatial filtering
characteristic of the confocal system provides a nice capability in eliminating
the contribution of cornea reflectance.
© 2014 IEEE
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