Diurnal variations of submacular choroidal circulation Naoya Hagiwara 1 , Yasutaka Kimura 1 , Hiroaki Isono 1 , Koji Aoyagi 1 , Ryo Shimizu 1 , Hideo Akiyama 1 1Dept of Ophthalmology, Gunma Univ Sch of Med pp.745-749
Published Date 1998/5/15
DOI https://doi.org/10.11477/mf.1410905848
  • Abstract
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We quantitated the circulation in the submacular and juxtapapillary choroid in 6 eyes of 6 healthy volunteers using a laser speckle flowgraphy. The square blur rate (SBR) value served as index of blood flow velocity. Measurement was made every 4 hours over a 24-hour period in each eye. We also monitored the systemic blood pressure, intraocular pressure and the heart rate. The diurnal variation in the submacular and juxtapapillary choroid averaged 29.1% and 19.0% respectively. The SBR value was positively correlated with the average systemic blood pressure and the ocular perfusion pressure at the correlation coefficient of 0.53 and 0.56 respectively in the submacular choroid and of 0.44 and 0.36 respectively in the juxtapapillary choroid. The SBR value was independent of the intraocular pressure or the heart rate. The findings show the presence of diurnal variation in the choroidal circulation in human eyes.

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