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Novel 3D computer-automated threshold Amsler grid visual field testing of scotomas in patients with glaucoma

Nguyen, Dieuthu T. and Fahimi, Ali and Fink, Wolfgang and Nazemi, Paul P. and Kim, Janet K. and Sadun, Alfredo A. (2009) Novel 3D computer-automated threshold Amsler grid visual field testing of scotomas in patients with glaucoma. European Journal of Ophthamology, 19 (5). pp. 776-782. ISSN 1724-6016. http://resolver.caltech.edu/CaltechAUTHORS:20091211-113348016

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Abstract

Purpose. Three-dimensional (3D) computer-automated threshold Amsler grid testing was used to identify and characterize scotomas typical of glaucoma. Methods. The 3D test exhibits a grid on a computer screen at a preselected grayscale and angular resolution, and allows patients to trace those areas on the grid that are missing in their visual field using a touch screen. Eleven eyes in patients with an established diagnosis of glaucoma were examined according to the above protocol. A total of 23 eyes from normal subjects were used as controls. The 5-minute test required that patients repeatedly outline scotomas on a touch screen with varied displays of contrast while maintaining their gaze on a central fixation marker. A 3D depiction of the visual field defects was then obtained that was further characterized by the location, shape, extent, depth, and slope of the scotomas. Results. In this pilot study, the 3D depiction of visual field loss demonstrated paracentral, superior and inferior altitudinal, and nasal step defects consistent with glaucomatous damage. The 3D depiction showed a shape, extent, depth, and slope that are consistent with the severity of damage. Conclusions. The 3D test identified and characterized scotomas typical of glaucoma. The test provides several advantages over conventional perimetry including additional information through 3D depiction of scotomas with the addition of contrast sensitivity and a higher angular/spatial resolution. Improved patient compliance and reliability through shorter testing time and potential interactive accessibility and distribution over the Internet further characterize the test.


Item Type:Article
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http://www.eur-j-ophthalmol.com/public/EJO/Article/Articleabstract.aspx?UidArticle=DD2DB1A0-7EE8-4DBB-81EF-7AB637045C2C&t=EJOPublisherUNSPECIFIED
Additional Information:© 2009 Wichtig Editore. Accepted: February 2, 2009; published online: 08/06/2009. Drs. Fink and Sadun have proprietary interest as patents on the test technology used in this study are issued. Drs. Nguyen. Fahimi, Nazemi, and Kim have no proprietary interest.
Subject Keywords:Glaucoma; Glaucomatous visual field defects; Perimetry; Screening; Visual field
Issue or Number:5
Record Number:CaltechAUTHORS:20091211-113348016
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20091211-113348016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16962
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:14 Dec 2009 21:48
Last Modified:26 Dec 2012 11:38

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