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Related Experiment Videos

Effect of fixation target on objective refraction.

N A McBrien, S P Taylor

    American Journal of Optometry and Physiological Optics
    |May 1, 1986
    PubMed
    Summary
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    Changes in fixation target color and detail, along with ambient illumination, have minimal impact on objective refraction measurements in emmetropic observers. These factors induce only small differences in refractive results.

    Area of Science:

    • Ophthalmology
    • Optometry
    • Vision Science

    Background:

    • Objective refraction is crucial for accurate vision correction.
    • Understanding factors influencing autorefractor readings is important for clinical practice.

    Purpose of the Study:

    • To investigate the influence of fixation target color and detail on objective refraction.
    • To assess the impact of ambient illumination on autorefractor results with varying fixation targets.

    Main Methods:

    • Utilized the Canon Autoref R-1 for objective refraction measurements.
    • Varied fixation target colors and detail levels.
    • Manipulated ambient illumination conditions.

    Main Results:

    • Observed minimal differences in objective refraction across different fixation target colors and details.

    Related Experiment Videos

  • Ambient illumination showed a small effect on refractive results.
  • Emmetropic observers exhibited minor variations in measurements.

    • Conclusions:

    • Fixation target characteristics and ambient light levels have a limited effect on objective refraction.
    • Autorefractor measurements are generally robust to these specific environmental and target variations.