Effect of reading with direct or indirect light on the visually evoked flow response in the posterior cerebral artery

Eszter Balogh, Tamás Árokszállási, László Csiba, László Oláh

Research output: Contribution to journalArticle

Abstract

Purpose: Reading with direct light from computer monitors or tablets may cause visual fatigue and hamper reading comprehension. Our aim was to compare the blood flow response in the supplying artery of the visual cortex when reading from tablet screen or from paper. The neurovascular coupling was tested also after 15-minute reading from either monitor or paper. Methods: Flow velocity responses evoked by reading from paper and from monitor were measured by transcranial Doppler sonography in a random sequence in both posterior cerebral arteries (PCAs) of 20 young healthy adults. Afterward, PCA flow response evoked by reading from paper was also investigated after 15 minutes reading on the same tablet or paper, in a random order. Results: Reading from monitor with its own source of light and reading from paper with indirect light caused very similar PCA flow response. Moreover, the flow velocity increase, evoked by reading form paper did not differ after 15-minute reading from monitor or from paper. Conclusions: Reading with direct or indirect light produces similar flow response in the occipital cortex.

Original languageEnglish
Pages (from-to)272-277
Number of pages6
JournalJournal of Clinical Ultrasound
Volume47
Issue number5
DOIs
Publication statusPublished - Jun 2019

Keywords

  • neurovascular coupling
  • reading
  • transcranial Doppler ultrasonography

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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