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The nasal step in normal and glaucomatous visual fields.

M Zingirian, G Calabria, E Gandolfo

    Canadian Journal of Ophthalmology. Journal Canadien D'Ophtalmologie
    |April 1, 1979
    PubMed
    Summary
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    The nasal step, a visual field defect, can indicate early glaucoma when exceeding specific size and depth thresholds. This characteristic sign is easily detected and valuable for monitoring glaucoma progression.

    Area of Science:

    • Ophthalmology
    • Visual Neuroscience

    Background:

    • The nasal step is a specific pattern observed in the visual field.
    • Distinguishing physiological variations from pathological defects is crucial for diagnosing eye conditions.

    Purpose of the Study:

    • To investigate the diagnostic significance of the nasal step in the nasal visual field.
    • To establish criteria for identifying the nasal step as an early indicator of glaucoma.

    Main Methods:

    • Utilized an original method combining kinetic and static perimetry for nasal visual field analysis.
    • Evaluated the width (degrees) and depth (log units) of the nasal step.

    Main Results:

    • Nasal steps <4 degrees wide and <0.5 log units deep may represent physiological asymmetry or artifacts.

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  • Nasal steps >4 degrees wide and >0.5 log units deep are indicative of glaucomatous defects.
  • Early glaucomatous nasal steps are reversible and characteristic.

    • Conclusions:

    • The nasal step is an early and characteristic glaucomatous visual field defect.
    • Its distinct characteristics allow for easy detection via kinetic and static perimetry.
    • The nasal step serves as a sensitive marker for monitoring glaucomatous damage progression.