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Related Experiment Videos

Studies of an automatic refraction machine.

S M Drance, D W Mitchell, M Schulzer

    Canadian Journal of Ophthalmology. Journal Canadien D'Ophtalmologie
    |October 1, 1975
    PubMed
    Summary
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    The Dioptron automatic refractor shows reliable results for spherical measurements but less so for cylindrical ones. Its high rejection rate impacts its overall clinical usefulness in eye refractions.

    Area of Science:

    • Ophthalmology
    • Optometry
    • Vision Science

    Background:

    • Accurate refractive error measurement is crucial for effective vision correction.
    • Automatic refraction machines offer potential for faster and more objective eye examinations.
    • Evaluating the performance of new diagnostic equipment is essential for clinical adoption.

    Purpose of the Study:

    • To assess the reproducibility and accuracy of the Dioptron automatic refraction machine.
    • To compare the Dioptron's measurements with established methods like retinoscopy and subjective refraction.
    • To evaluate the clinical utility of the Dioptron, considering its performance and rejection rate.

    Main Methods:

    • The Dioptron automatic refraction machine was used to obtain refractive measurements.

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  • Reproducibility of Dioptron measurements was assessed.
  • Dioptron results were compared against retinoscopy and subjective refraction findings.
  • The machine's rejection rate was recorded and analyzed.

    • Main Results:

    • The Dioptron demonstrated good reproducibility for refractive measurements.
    • Spherical component measurements showed strong correlation with retinoscopy and subjective refraction.
    • Cylindrical power measurements exhibited weaker correlation compared to spherical components.
    • A high rejection rate for the Dioptron machine was observed during the study.

    Conclusions:

    • The Dioptron automatic refractor is a reproducible device for measuring spherical refractive errors.
    • Its accuracy in determining cylindrical refractive error requires further investigation and may be limited.
    • The high rejection rate necessitates careful consideration of the Dioptron's practical utility in routine optometric and ophthalmologic practice.