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Related Experiment Videos

Time changes of contrast thresholds during automatic perimetry.

A Heijl

    Acta Ophthalmologica
    |August 1, 1977
    PubMed
    Summary
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    Glaucoma patients showed decreased contrast sensitivity over time during visual field testing. This decline was more pronounced in patients, especially near visual field defects, indicating progressive vision loss.

    Area of Science:

    • Ophthalmology
    • Visual Science
    • Medical Technology

    Background:

    • Glaucoma is a progressive optic neuropathy characterized by visual field loss.
    • Assessing visual field sensitivity is crucial for glaucoma diagnosis and monitoring.
    • Short-term fluctuations in visual field testing can impact diagnostic accuracy.

    Purpose of the Study:

    • To investigate the effect of increasing test duration on contrast sensitivity in glaucoma patients and healthy subjects.
    • To evaluate the relationship between test time, visual field defects, and fixation stability.
    • To analyze short-term variations in contrast thresholds during prolonged visual field examinations.

    Main Methods:

    • Contrast thresholds were measured at six visual field points using a staircase method with an automatic perimeter (Heijl & Krakau, 1975b).

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  • Uninterrupted testing sessions lasted approximately 30 minutes.
  • Nineteen glaucoma patients (suspected or confirmed) and twelve healthy controls participated.

    • Main Results:

    • Contrast sensitivity decreased with increasing test time in all subjects.
    • Threshold increments were significantly larger in glaucoma patients (6-10 dB) compared to normal subjects (<1.5 dB).
    • Larger threshold increments and increased short-term variation were observed in eyes with existing visual field defects.
    • Fixation impairment increased with test time in the glaucoma group.

    Conclusions:

    • Prolonged visual field testing reveals a progressive decline in contrast sensitivity, particularly in glaucoma patients.
    • The extent of sensitivity loss correlates with the presence and location of visual field defects.
    • Increased test duration may exacerbate fixation instability and reveal subtle functional deficits in glaucoma.