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Related Experiment Videos

Choroidal blood flow II. Reflexive control in the monkey

L M Parver, C R Auker, D O Carpenter

    Archives of Ophthalmology (Chicago, Ill. : 1960)
    |August 1, 1982
    PubMed
    Summary

    Light exposure increases eye tissue temperature in the fellow eye, likely due to increased choroidal blood flow. This mechanism helps protect the macula

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    Area of Science:

    • Ophthalmology
    • Physiology
    • Ocular Thermoregulation

    Background:

    • The macula is sensitive to temperature changes.
    • Light exposure can generate heat within the eye.

    Purpose of the Study:

    • To investigate the effect of light stimulation on ocular tissue temperature.
    • To determine the role of choroidal blood flow in regulating eye temperature.

    Main Methods:

    • Temperature measurements were taken from the retina-choroid, sclera, and conjunctiva in cynomolgus monkeys.
    • One eye was exposed to light, while the fellow eye's temperature was monitored.
    • Hydrogen washout technique was used to measure blood flow in the retina-choroid.

    Main Results:

    • Light stimulation of one eye increased tissue temperature in the non-stimulated fellow eye.
    • This temperature increase was correlated with a reflexive rise in choroidal blood flow.
    • Retina-choroid blood flow measurements confirmed the increase.

    Conclusions:

    • A reflexive increase in choroidal blood flow is a key response to light stimulation.
    • This mechanism, alongside passive heat dissipation, safeguards the macula's outer layers from thermal damage.
    • Ocular blood flow plays a vital role in maintaining retinal temperature homeostasis.

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