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Related Experiment Videos

Recent developments in automatic refraction.

H A Knoll

    The British Journal of Physiological Optics
    |January 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    The Ophthalmetron, an infra-red retinoscopy device, accurately measures refractive error. Early studies show its automated refraction endpoint aligns well with traditional methods.

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    Area of Science:

    • Ophthalmology
    • Optometry
    • Biomedical Engineering

    Background:

    • Accurate refractive error measurement is crucial for vision correction.
    • Traditional retinoscopy can be time-consuming and subjective.
    • Development of automated refractors aims to improve efficiency and objectivity.

    Purpose of the Study:

    • To provide a detailed description of the Ophthalmetron, an automatic refractometer.
    • To evaluate the performance and accuracy of the Ophthalmetron.
    • To compare the Ophthalmetron with existing commercial automatic refractometers.

    Main Methods:

    • The Ophthalmetron utilizes infra-red retinoscopy with a rapid light scan.
    • It determines the direction of retinal reflex motion and electronic null-point detection.

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  • The instrument has a sensitivity range of -18.00 D to +17.00 D with 0.25 D resolution.

    • Main Results:

    • The Ophthalmetron automatically plots results on a chart drum.
    • Early validation studies indicate good agreement between Ophthalmetron findings and conventional retinoscopy.
    • The device demonstrates reliable automated refraction endpoint determination.

    Conclusions:

    • The Ophthalmetron is a promising automatic refractometer with potential for clinical use.
    • Its automated nature and accuracy support its role in objective refractive error assessment.
    • Further validation and comparison with other devices are valuable for understanding its full capabilities.