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Klin Monbl Augenheilkd. 2000 May;216(5):311-2.

[Effect of light on choroidal blood flow in the fovea centralis].

[Article in French]

Author information

1
Institut de Recherche en Ophtalmologie, Sion, Suisse.

Abstract

PURPOSE:

To investigate whether light and dark exposures induce a response of choroidal blood flow (ChBF) in the foveal region in humans.

METHODS:

In a group of healthy volunteers (age 25-60 years) ChBF was measured using a new confocal laser Doppler flowmeter (probing laser at 785 nm, power at the cornea = 90 microW). ChBF was recorded at room light, in darkness, at room light following dark adaptation, and during strong light exposure following room light.

RESULTS:

While ChBF was stable during room light condition, it decreased significantly by 15% (p < 0.01) during darkness. After 6 min of room light following darkness, ChBF was back to baseline. Strong diffuse, green light exposure over a field of 45 degrees had no detectable effect on ChBF. In all the experiments, no significant change of blood pressure was detected.

CONCLUSIONS:

Our findings did not confirm the presence of an active process of ChBF regulation in response to strong light exposure in humans. They demonstrate, however, a reversible decrease in ChBF occurring after a transition from room light to darkness.

PMID:
10863701
DOI:
10.1055/s-2000-10991
[Indexed for MEDLINE]

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