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[Clinical experiences with the hand-held keratometer]

K H Wassill1, B Dick

  • 1Universitäts-Augenklinik für Schielbehandlung und Neuroophthalmologie Giessen.

Klinische Monatsblatter Fur Augenheilkunde
|August 1, 1995
PubMed
Summary

The handkeratometer provides corneal power measurements similar to autokeratometers and videokeratoscopes, regardless of patient position. Its ease of use makes it a valuable tool for examining children's corneas.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Biomedical Engineering

Background:

  • Assessing the clinical utility of an automatic handkeratometer.
  • Comparing its accuracy against established corneal power measurement methods.
  • Investigating the impact of patient positioning on measurement outcomes.

Purpose of the Study:

  • To evaluate the handkeratometer's effectiveness in corneal power measurement.
  • To compare handkeratometer results with autokeratometry and videokeratography.
  • To determine if patient position (standing vs. lying) affects measurements.

Main Methods:

  • Corneal power was measured in 31 children and 60 adults using a handkeratometer (standing and lying), autokeratometer, and videokeratography.
  • Key parameters analyzed included steepest/flattest corneal radii, cylinder power, and axis.
  • Statistical analysis compared intraindividual variability and measurement differences between devices.

Main Results:

  • Handkeratometer measurements showed high statistical significance when compared to videokeratoscopy for both standing and lying positions.
  • Mean corneal radii and cylinder power values were similar across all tested instruments for both children and adults.
  • Intraindividual variability for astigmatism measurements was comparable between the handkeratometer and other devices.

Conclusions:

  • The handkeratometer's corneal power measurements are consistent and similar to autokeratometer and videokeratoscope results.
  • Measurement outcomes are independent of patient position (standing or lying).
  • The handkeratometer's simple operation and acceptance in children make it a useful alternative for corneal examination.

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