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Analysis of accommodation function with ultrasonography

A P Beers1, G L van der Heijde

  • 1Department of Ophthalmology, Free University Hospital Amsterdam, The Netherlands.

Documenta Ophthalmologica. Advances in Ophthalmology
|January 1, 1996
PubMed
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This study introduces a new ultrasonography method to measure accommodation response latency and duration. This technique offers more objective data for diagnosing eye conditions than traditional methods.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Physiology

Background:

  • Accurate assessment of the eye's accommodation function is crucial for diagnosing various visual disorders.
  • Traditional methods for measuring accommodation, such as accommodative amplitude, provide limited objective data.
  • Ultrasonography offers a potential non-invasive method for dynamic ocular measurements.

Observation:

  • A novel continuous ultrasonographic biometry technique was employed to measure changes in lens thickness during accommodation.
  • Accommodation response latency and duration were determined from these measurements.
  • Data were collected from 20 healthy individuals across different age groups and three patients with specific accommodation disorders.

Findings:

  • Normal accommodation response latency was found to be 394 ms (+/-46 SD) and age-independent.

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  • Normal response duration increased with age, from 306 ms at 15 years to 954 ms at 55 years.
  • Ultrasonography revealed distinct latency and duration patterns in patients with diabetes, Adie's syndrome, and third nerve palsy, differentiating them from healthy subjects.

    • Implications:

    • Ultrasonographically determined accommodation latency and duration provide more comprehensive and objective information than maximum accommodative amplitude alone.
    • This method shows promise in aiding the diagnosis and management of patient complaints related to accommodation disorders.
    • Further clinical validation could establish ultrasonography as a valuable tool in ophthalmological practice.