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An over-refraction program for the TI 59 card-programmable calculator.

J H Carter

    American Journal of Optometry and Physiological Optics
    |July 1, 1979
    PubMed
    Summary
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    Over-refraction is a valuable refractive examination technique for aphakic or highly ametropic patients. Programmable calculators now make this method clinically practical, overcoming previous mathematical challenges.

    Area of Science:

    • Ophthalmology
    • Optometry
    • Optical Engineering

    Background:

    • Over-refraction is a key method for refractive error assessment in aphakic and highly ametropic individuals.
    • Previous limitations in combining over-refraction data with original spherocylinders hindered clinical application.
    • Advancements in technology have created opportunities to overcome these practical difficulties.

    Purpose of the Study:

    • To present a practical clinical application of over-refraction using programmable calculators.
    • To demonstrate the feasibility of integrating over-refraction with existing refractive data.
    • To simplify the process of refractive examination for complex cases.

    Main Methods:

    • Development of a dedicated over-refraction program for the Texas Instruments TI-59 Card-Programmable Calculator.

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  • Utilizing programmable calculator technology to address mathematical and graphical complexities.
  • Testing the program's efficiency for clinical use.

    • Main Results:

    • The developed program effectively combines over-refraction with original spherocylinders.
    • The program significantly enhances the clinical practicality of over-refraction methods.
    • Program execution time, excluding data input and output, is less than 15 seconds.

    Conclusions:

    • Programmable calculators, like the TI-59, make over-refraction a clinically viable and efficient tool.
    • This technological integration overcomes historical limitations in applying over-refraction.
    • The presented program offers a rapid and practical solution for refractive examinations in challenging patient groups.