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      Visual Field Defects and Normal Nerve Fiber Layer: May They Coexist in Primary Open-Angle Glaucoma?

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          Abstract

          The retinal nerve fiber layer (RNFL) is the anatomical structure most sensitive to glaucoma injury. Before a functional loss such as a visual field defect is displayed, a large number of nerve fibers can be damaged. However, there are glaucoma patients in which an apparently normal RNFL coexists with evident visual field defects. A total of 54 eyes affected with primary open-angle glaucoma were studied. Visual field was examined with the Humphrey Field Analyzer (Zeiss) using program 30-2. The Nerve Fiber Analyzer II (Laser Diagnostic Technologies) was used to study the RNFL of these patients. Mean deviation of the visual field ranged from 6 to 31 dB in all eyes that were examined. The average thickness of the RNFL ranged from 20 to 90 μm. According to our previous experience 75 μm was fixed as the cutoff between normal and pathological values of RNFL thickness. We identified 5 eyes with a RNFL thickness over 75 μm and a visual field with a mean deviation over 6 dB; 9% of the studied eyes were found to have a visual field defect with no changes in RNFL. We conclude that not all subjects have the same number of fibers at birth and that it is therefore possible to underestimate the RNFL changes. Our study illustrates that the concept of normal and altered has to be considered as a relative one for all the aspects characterizing the glaucomatous disease.

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          Author and article information

          Journal
          OPH
          Ophthalmologica
          10.1159/issn.0030-3755
          Ophthalmologica
          S. Karger AG
          0030-3755
          1423-0267
          2000
          April 2000
          15 March 2000
          : 214
          : 2
          : 119-121
          Affiliations
          University Eye Clinic, Verona, Italy
          Article
          27479 Ophthalmologica 2000;214:119–121
          10.1159/000027479
          10720915
          81c9bb0c-1544-4e0b-a356-bfea54ed3be0
          © 2000 S. Karger AG, Basel

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          History
          Page count
          References: 13, Pages: 3
          Categories
          Original Paper · Travail original · Originalarbeit

          Vision sciences,Ophthalmology & Optometry,Pathology
          Glaucoma,Visual field,Retinal nerve fiber layer

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