Abstract
Purpose :
Biometric evaluations of the iris using Heidelberg Spectralis imaging technology.
Background: Infrared (IR) iris scans are used for biometric recognition in airports. However, eyeMDs have not embraced the latest IR technology to evaluate the iris, affected in diabetes, glaucoma, and inherited anterior segment diseases. In 2018, Postalache et al used IR imaging to detect features of the iris not seen in standard light photography. IR imaging could be used to identify crypts, collarettes, ciliary regions, pupillary regions, nevi, contraction furrows, and other features of the iris. Here we describe a novel use of IR imaging for the evaluation of the iris. This work could add to future imaging techniques for new tools for eyeMDs.
Methods :
Eyes were imaged using Heidelberg Spectralis, 1081 λ (Heidelberg Engineering HRA + OCT : Heidelberg GE). Crypts were counted and colarrettes were measured in each subject. Adobe Photoshop was used to identify and measure crypts and collarettes.
Results :
Figure 1.1 - IR image iris in a WM. a) nevi, b) contraction furrows, c) pupillary region, d) ciliary region, e) collarette, f) pupillary boundary
Figure 1.2 - 90° sector IR image iris in WM.a) contraction furrow, b) crypt, c) ridge
Figure 2.1 - IR image iris in a South Asian. a) crypt, b) collarette, c) pupillary region, d) ciliary region, e) pupillary boundary
Figure 2.2 - 90° sector IR image iris in a South Asian. a) five crypts in the iris, b) ridge.
Figure 3.1: IR image iris in a Asian. Collarette outlined in white, arrows point to five crypts
Figure 3.2: 90° sector IR image iris in a Asian. Arrows point to five crypts in the iris
Figure 4.1: IR image iris in a East Asian subject. Collarette is outlined in white, arrows point to five crypts in the iris.
Figure 4.2: 90° sector IR image iris in a East Asian. Arrows point to six crypts in the iris.
Figure 5.1: IR image iris in a East Asian. Collarette is outlined in white.
Figure 5.2: 90° sector IR image iris in a Filipino. Arrows point to six crypts in the iris.
Table 1: total number of crypts identified in a 90° sector IR image and collarette measurements for each subject. There are ethnic differences in the number of crypts in the iris. Collarette measurements differ across ethnic lines as well.
Conclusions :
This small pilot study shows that IR photography can document small changes in the iris. We hope other researchers will join us to explore the latest software tools to evaluate the iris.
This is a 2021 ARVO Annual Meeting abstract.