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Related Experiment Videos

A hand-held keratometer

A K Lam1

  • 1Department of Optometry and Radiography, Hong Kong Polytechnic University, Hung Hom.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|May 1, 1995
PubMed
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The Alcon hand-held autokeratometer requires vertical positioning for accurate axis readings. This device accurately measures corneal curvature, comparable to traditional methods, making it suitable for infant eye exams.

Area of Science:

  • Ophthalmology
  • Optometry
  • Biomedical Engineering

Background:

  • Accurate measurement of corneal curvature is essential for vision correction.
  • Hand-held autokeratometers offer potential for portable eye examinations.
  • Understanding device orientation sensitivity is crucial for reliable clinical use.

Purpose of the Study:

  • To assess the Alcon hand-held autokeratometer's sensitivity to orientation.
  • To compare the autokeratometer's measurements with a standard keratometer.
  • To determine the optimal usage position for accurate readings.

Main Methods:

  • Calibration of the autokeratometer using steel balls.
  • Orientation sensitivity testing using model eyes.
  • Corneal curvature measurement in optometry students comparing the autokeratometer and Bausch and Lomb keratometer.

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Main Results:

  • The autokeratometer demonstrated sensitivity to orientation, requiring vertical positioning (6:00/12:00) for accurate axis references.
  • Measurements of vertical and horizontal principal meridians were comparable to the Bausch and Lomb keratometer.
  • The axis of the vertical principal meridian was accurately measured.

Conclusions:

  • The Alcon hand-held autokeratometer should be used in a vertical orientation for precise axis measurements.
  • The device shows good agreement with a standard keratometer for measuring corneal curvature.
  • This hand-held keratometer is a valuable tool for screening and examining infant corneas.