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Related Experiment Videos

Blue field entoptic phenomenon in amblyopia

J E Grunwald, S H Sinclair, A S Crandall

    Ophthalmology
    |October 1, 1981
    PubMed
    Summary

    The blue field entoptic phenomenon, which visualizes leukocytes in retinal capillaries, was studied in amblyopic patients. Findings indicate altered leukocyte perception in amblyopic eyes, suggesting a potential diagnostic tool.

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    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Physiology

    Background:

    • The blue field entoptic phenomenon (BFEP) allows visualization of leukocytes in retinal capillaries.
    • BFEP is unaffected by media opacities if sufficient blue light penetrates the retina.

    Purpose of the Study:

    • To investigate differences in BFEP perception between amblyopic and fellow eyes.
    • To assess the potential of BFEP for evaluating amblyopic eyes with opaque media.

    Main Methods:

    • Sixty-three amblyopic patients and 20 normal subjects participated.
    • Participants observed leukocytes via BFEP in both their amblyopic and good eyes.
    • Perceptual differences in sharpness, quantity, speed, and tail presence of leukocytes were recorded.

    Main Results:

    • Amblyopic eyes showed significantly altered leukocyte perception compared to good eyes.
    • 94% perceived less sharp particles, 83% fewer particles, 60% slower particles.
    • 86% had shorter or absent leukocyte tails in amblyopic eyes; perception correlated with amblyopia severity.

    Conclusions:

    • BFEP perception is demonstrably altered in amblyopic eyes.
    • These visual alterations suggest BFEP's potential as a non-invasive method for assessing amblyopia, even with media opacity.

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