Abstract
We describe a new unit of the Jena retinal camera for automatic measurement of
retinal vessel diameter. The brightness profile perpendicular to the vessel is
registered by CCD line sensor and the signal is transmitted to the computer. An
adaptive computer program recognizes the edges of vessels and estimates the
vessel diameters automatically. Applying several measurements per vessel, the
intraindividual standard deviation may be smaller than 3\%. By using the same
objective measuring edge criterion, the measuring results are comparable between
different observers and methods. Error sources are discussed. Measured vessel
reactions to oxygen breathing and reduced perfusion pressure are presented to
demonstrate the efficiency of this new method.
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