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Related Experiment Videos

Automated refraction in aphakia--II. Its repeatability and accuracy compared to conventional techniques.

M Guillon

    Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
    |January 1, 1986
    PubMed
    Summary

    The Ophthalmetron electronic optometer demonstrated superior repeatability compared to retinoscopy for aphakic patients. While both methods showed comparable accuracy, the Ophthalmetron was marginally better for sphere, and retinoscopy for cylinder power.

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    Area of Science:

    • Ophthalmology
    • Optometry
    • Vision Science

    Background:

    • Accurate refractive error assessment is crucial for managing aphakia.
    • Traditional methods like retinoscopy have limitations in repeatability and accuracy.
    • Advancements in optometric technology offer potential improvements.

    Purpose of the Study:

    • To compare the repeatability and accuracy of the Ophthalmetron (i.r. electronic optometer) against retinoscopy in aphakia.
    • To evaluate the performance of objective refraction techniques against subjective findings.

    Main Methods:

    • 17 aphakic patients were tested three times using the Ophthalmetron and retinoscopy.
    • Subjective refraction techniques were employed to establish a mean 'true' refractive value for comparison.

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    Main Results:

    • The Ophthalmetron exhibited significantly better repeatability than retinoscopy.
    • Sphere accuracy was marginally superior with the Ophthalmetron.
    • Cylinder power accuracy was marginally superior with retinoscopy when compared to the mean subjective results.

    Conclusions:

    • The Ophthalmetron offers improved repeatability for refractive error assessment in aphakia.
    • Both Ophthalmetron and retinoscopy provide valuable, albeit slightly different, accuracy profiles for sphere and cylinder in aphakia.