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Simulating refractive errors: source and observer methods.

C Chan, G Smith, R J Jacobs

    American Journal of Optometry and Physiological Optics
    |March 1, 1985
    PubMed
    Summary
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    Simulating refractive errors involves two main methods: observer and source. The source method, though artificial, appears superior for research, with results comparable via a standardized blur disc parameter.

    Area of Science:

    • Ophthalmology
    • Optical Engineering
    • Vision Science

    Background:

    • Refractive errors are common vision impairments.
    • Accurate simulation of refractive errors is crucial for research.
    • Existing simulation methods present challenges in result comparison.

    Purpose of the Study:

    • To compare two principal methods for simulating refractive errors: the observer method and the source method.
    • To identify the superior method for simulating refractive errors.
    • To establish a common parameter for comparing results from different simulation methods.

    Main Methods:

    • Describing the observer method (optical system defocusing the retinal image).
    • Describing the source method (defocusing the image source projected onto a screen).

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  • Investigating a common parameter: the angular blur-disc diameter, measured in image or object space.

    • Main Results:

    • The source method, despite being more artificial, demonstrates superiority for simulating refractive errors.
    • Significant differences exist between observer and source methods, complicating direct result comparison.
    • The angular blur-disc diameter is proposed as a valid, interchangeable parameter for comparing defocus levels.

    Conclusions:

    • The source method is recommended for simulating refractive errors due to its advantages.
    • Standardizing the measurement of angular blur-disc diameter facilitates cross-method result comparison.
    • The formula omega = D delta L, relating blur diameter to pupil size and defocus, is investigated for validity.