Continuous retinal vessel diameter m easurements: the future in retinal vessel assessment?


PURPOSE. To establish an alternative method, sequential and diameter response analysis (SDRA), to determine dynamic retinal vessel responses and their time course in serial stimulation compared with the established method of averaged diameter responses and standard static assessment. METHODS. SDRA focuses on individual time and diameter responses, taking into account the fluctuation in baseline diameter, providing improved insight into reaction patterns when compared with established methods as delivered by retinal vessel analyzer (RVA) software. SDRA patterns were developed with measurements from 78 healthy nonsmokers and subsequently validated in a group of 21 otherwise healthy smokers. Fundus photography and retinal vessel responses were assessed by RVA, intraocular pressure by contact tonometry, and blood pressure by sphygmomanometry. RESULTS. Compared with the RVA software method, SDRA demonstrated a marked difference in retinal vessel responses to flickering light (P 0.05). As a validation of that finding, SDRA showed a strong relation between baseline retinal vessel diameter and subsequent dilatory response in both healthy subjects and smokers (P 0.001). The RVA software was unable to detect this difference or to find a difference in retinal vessel arteriovenous ratio between smokers and nonsmokers (P 0.243). However, SDRA revealed that smokers’ vessels showed both an increased level of arterial baseline diameter fluctuation before flicker stimulation (P 0.005) and an increased stiffness of retinal arterioles (P 0.035) compared with those in nonsmokers. These differences were unrelated to intraocular pressure or systemic blood pressure. CONCLUSIONS. SDRA shows promise as a tool for the assessment of vessel physiology. Further studies are needed to explore its application in patients with vascular diseases.

Publication DOI:
Divisions: College of Health & Life Sciences > School of Optometry > Optometry
College of Health & Life Sciences > School of Optometry > Optometry & Vision Science Research Group (OVSRG)
College of Health & Life Sciences
College of Health & Life Sciences > School of Optometry > Vision, Hearing and Language
Additional Information: Creative Commons Attribution Non-Commercial No Derivatives License
Uncontrolled Keywords: sequential and diameter response analysis,dynamic retinal vessel responses,time course,serial stimulation,averaged diameter responses,standard static assessment,SDRA,vessel physiology,vascular diseases,Ophthalmology,Sensory Systems,Cellular and Molecular Neuroscience
Publication ISSN: 1552-5783
Last Modified: 27 Jun 2024 07:52
Date Deposited: 25 May 2011 10:17
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
http://www.iovs ... 51/11/5833.full (Publisher URL)
PURE Output Type: Article
Published Date: 2010-04-30
Authors: Heitmar, Rebekka (ORCID Profile 0000-0002-7657-1788)
Blann, Andrew D.
Cubbidge, Robert P. (ORCID Profile 0000-0002-7851-1375)
Lip, Gregory Y.H.
Gherghel, Doina (ORCID Profile 0000-0001-9439-5573)

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