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Digital image analysis of optic nerve head pallor as a diagnostic test for early glaucoma

  • Clinical Investigations
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Abstract

We developed a computer-based technique to quantify optic nerve head pallor from videographically acquired digitized optic nerve images and tested the ability of pallor measurements to discriminate between normal eyes and eyes with early glaucoma. Corresponding pixel values from images obtained under 540 nm (green) and 640 nm (red) light with a videographic fundus camera were used to quantify optic nerve head pallor. A pallor density histogram was calculated for each eye, and contained values between 0 (red) to 1 (white). A measure of the distribution width of the histogram provided pallor measurements standardized to the measurements of the large veins of the disc. A database of one eye each of 44 normal controls and 70 patients with early open angle glaucoma was used to test the measurements for diagnotistic sensitivity and specificity. These standardized pallor measurements did not perform better than absolute pallor measurements to discriminate between normal and glaucomatous eyes. The sensitivity and specificity of standardized pallor measurements (49% and 57%, respectively, for this database) were not as good as those for stereoscopic measurements of disc rim area in the same database (70% and 73%). Pallor measurements of this type do not appear to be sensitive or specific indicators of early glaucoma.

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Authors and Affiliations

  1. Glaucoma Section, Yale University School of Medicine, Department of Ophthalmology and Visual Science, 330 Cedar Street, 06510, New Haven, CT, USA

    Albert Assad & Joseph Caprioli

Authors
  1. Albert Assad
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  2. Joseph Caprioli
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Additional information

Supported in part by grants from Research to Prevent Blindness, Inc, The Connecticut Lions Eye Research Foundation, and Alcon Laboratories, Inc.; the authors have no proprietary interest in the instruments or software described within

Correspondence to: J. Caprioli

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Assad, A., Caprioli, J. Digital image analysis of optic nerve head pallor as a diagnostic test for early glaucoma. Graefe's Arch Clin Exp Ophthalmol 230, 432–436 (1992). https://doi.org/10.1007/BF00175928

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  • DOI: https://doi.org/10.1007/BF00175928

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