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Related Experiment Videos

Accommodation power determined with transient pattern visual evoked cortical potentials in diabetes.

S Yamamoto1, E Adachi-Usami, N Kuroda

  • 1Department of Ophthalmology, School of Medicine, Chiba University, Japan.

Documenta Ophthalmologica. Advances in Ophthalmology
|May 1, 1989
PubMed
Summary

Objective accommodation measurement using pattern visual evoked cortical potentials (VECPs) revealed significant attenuation in older adults and diabetics. This objective method provided higher accommodation power values compared to subjective near-point rule measurements.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Clinical Electrophysiology

Background:

  • Aging and diabetes mellitus are known to affect ocular accommodation.
  • Accurate objective measurement of accommodation is crucial for understanding visual function.
  • Pattern visual evoked cortical potentials (VECPs) offer a potential method for objective assessment.

Purpose of the Study:

  • To objectively measure changes in accommodation power with aging and in diabetes mellitus.
  • To compare objective accommodation measurements using VECPs with subjective near-point rule methods.

Main Methods:

  • Transient VECPs were recorded in 45 normal subjects and 32 diabetic patients.
  • Accommodation stimulus was increased in one-diopter steps using minus power lenses until VECP was unrecordable.

Related Experiment Videos

  • Objective accommodation was determined by extrapolating the linear relationship between VECP P100 amplitude and accommodation stimulus to 0 microV.

    • Main Results:

    • VECP P100 amplitude attenuated linearly with increasing accommodation stimulus.
    • Accommodation power was significantly attenuated in normal subjects over 40 years old and in diabetic patients.
    • Objective accommodation measurements were approximately 2.5 diopters higher than subjective near-point rule measurements.

    Conclusions:

    • Pattern VECPs provide a reliable method for objective accommodation assessment.
    • Accommodation function is impaired with aging and in diabetes mellitus.
    • Objective VECP-based accommodation measurement offers a more sensitive assessment than subjective methods.