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Related Experiment Videos

Calcium blocks selectively the EOG-light peak.

H Hofmann, G Niemeyer

    Documenta Ophthalmologica. Advances in Ophthalmology
    |October 15, 1985
    PubMed
    Summary
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    Increasing external calcium ions significantly reduces the light peak (LP) amplitude in the eye. This suggests calcium ions play a crucial role in initiating the LP, a key component of retinal light response.

    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Physiology

    Background:

    • The light peak (LP) is a slow increase in the eye's standing potential.
    • It is primarily attributed to the depolarization of the retinal pigment epithelium's (RPE) basal membrane.

    Purpose of the Study:

    • To investigate the effect of external calcium ion concentrations ([Ca++]0) on the LP in an arterially perfused cat eye model.
    • To determine if calcium ions are involved in the initiation of the LP.

    Main Methods:

    • Tested varying external calcium ion concentrations in an arterially perfused cat eye.
    • Measured the amplitude of the LP and other electroretinogram components (c-wave, fast oscillation, second c-wave, a- and b-waves).

    Main Results:

    Related Experiment Videos

    • A 3.2 mM increase in external calcium ions depressed the LP amplitude by 85-90%.
    • Other light response components (c-wave, fast oscillation, second c-wave, a- and b-waves) remained unaffected.
    • The effect of elevated calcium was observed only during LP initiation and was reversible.

    Conclusions:

    • External calcium ions play a significant role in the initiation of the light peak (LP).
    • The findings support the hypothesis that intracellular calcium released from pigment granules during illumination initiates the LP.