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Ulf Havelius, Flemming Hansen, Bengt Hindfelt, Torsten Krakau; Human Ocular Vasodynamic Changes in Light and Darkness. Invest. Ophthalmol. Vis. Sci. 1999;40(8):1850-1855.
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purpose. To determine whether changes in the retinal blood flow in light and
darkness occur in humans.
methods. The systolic and diastolic flow velocities were measured by color
Doppler in the ophthalmic and the central retinal arteries in 12
healthy individuals in light and darkness.
results. In the ophthalmic artery there was a trend toward lower systolic
velocity in darkness compared with that in the light, but there was no
change in diastolic velocity. In the central retinal artery the
systolic and the diastolic flow velocities were markedly increased in
darkness. After re-exposure to light the systolic flow velocity
conclusions. Darkness is associated with increased blood flow velocity in the
central retinal artery, probably reflecting increased retinal metabolic
demands by the photoreceptors.
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