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Assessment of Van Herick technique by using ImageJ software
Author(s): Dolores Ferreiro; Silvia García-Montero; Jacobo Garcia-Queiruga; Eva Punin Dorrio; Eva Yebra-Pimentel
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Paper Abstract

Purpose: Primary angle-closure glaucoma is a common cause of blindness where angle closure is a fundamental pathologic process. Van Herick technique is one of the commonest tests used in clinical settings for iridocorneal angle estimation, but training is required. With the development of imaging devices for the anterior segment of the eye, such as multi-diagnostic platform VX120 (Visionix), objective quantification of the angle can be obtained. The purpose of this study is to compare the angle estimation of Van Herick (with the aid of image processing software) with that obtained by objective VX120 platform. Material and methods: 49 subjects were enrolled in the study among patients attending the Optometry Clinic of the Optometry Faculty (USC). All of them were assessed with multi-diagnostic platform VX120 (Visionix) in order to obtain the Anterior Chamber Depth (ACD) and temporal iridocorneal angle (TA) parameters. Then, an image of the temporal optic section of the cornea (following the requirements of Van Herick technique) was obtained from each subject by using a camera attached to a slit-lamp. Finally, Van Herick’s temporal angle was determined as a ratio between the peripheral anterior chamber depth and corneal thickness (AC/SC ratio) by using ImageJ software. Results: Van Herick´s AC/SC ratio showed a significant correlation with both TA (r=0.389, p=0.006) and ACD (r=0.370, p=0.009). As expected, both VX120 parameters (ACD and TA) showed a significant correlation between them (r=0.863, p<0.001). Conclusions: Van Herick´s AC/SC by using ImageJ software supposes a valuable parameter for iridocorneal angle estimation.

Paper Details

Date Published: 3 October 2019
PDF: 6 pages
Proc. SPIE 11207, Fourth International Conference on Applications of Optics and Photonics, 112071F (3 October 2019); doi: 10.1117/12.2527375
Show Author Affiliations
Dolores Ferreiro, Univ. de Santiago de Compostela (Spain)
Silvia García-Montero, Univ. de Santiago de Compostela (Spain)
Jacobo Garcia-Queiruga, Univ. de Santiago de Compostela (Spain)
Eva Punin Dorrio, Univ. de Santiago de Compostela (Spain)
Eva Yebra-Pimentel, Univ. de Santiago de Compostela (Spain)


Published in SPIE Proceedings Vol. 11207:
Fourth International Conference on Applications of Optics and Photonics
Manuel Filipe P. C. M. Martins Costa, Editor(s)

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