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Visual field changes in ocular hypertension. A computer-based analysis

W M Hart, B Becker

    Archives of Ophthalmology (Chicago, Ill. : 1960)
    |July 1, 1977
    PubMed
    Summary
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    Visual field parameters like isopter area change linearly with age in non-responders but are randomly distributed with intraocular pressure (IOP). In responders, elevated IOP significantly reduces central visual field area.

    Area of Science:

    • Ophthalmology
    • Visual field testing
    • Intraocular pressure

    Background:

    • Age-related changes in visual fields are well-documented.
    • The relationship between intraocular pressure (IOP) and visual field parameters requires further investigation, especially in specific patient populations.

    Purpose of the Study:

    • To investigate the relationship between age, intraocular pressure (IOP), and visual field parameters.
    • To analyze visual field changes in corticosteroid non-responders and responders.

    Main Methods:

    • Development of a minicomputer system for digitizing and storing visual field data.
    • Analysis of isopter areas (i4e, i2e) and blind spot size in 110 corticosteroid non-responders (age 10-75).
    • Evaluation of central visual field area (i2e isopter) in 32 corticosteroid responders with normal baseline visual fields.

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    Main Results:

    • In non-responders, visual field parameters (i4e, i2e isopters, blind spot) showed linear changes with age.
    • In non-responders, these parameters were randomly distributed concerning IOP.
    • In responders, elevated IOP (>31 mm Hg) led to a nonlinear reduction in central visual field area (i2e isopter), with significant effects observed when IOP exceeded 8 mm Hg.

    Conclusions:

    • Age is a significant factor influencing visual field parameters in individuals not responding to corticosteroids.
    • Elevated intraocular pressure, particularly above 8 mm Hg, is a critical factor in reducing central visual field area in corticosteroid responders.
    • The study highlights distinct patterns of visual field changes related to age and IOP in different patient groups.