There are two variants of<unk>  which are based on a special fundus camera, the<unk><unk>  Analyzer which was developed by Imedos, a medical engineering company in Jena, Germany. Basically, the<unk><unk>  Analyzer measures the diameters of small arteries (arterioles) and vein (venules) in the posterior segment of the eye. In static<unk>  this is a snapshot, in dynamic<unk><unk>  (DVA) a 12.5 Hz optoelectric flickering light induces a stimulation of a specific segment of the<unk> to which the<unk> s react by a change in their diameter which is quantified by the device. There are different protocols for conducting this examination; a typical procedure consists of applying flicker light three times over 20 seconds each, followed by 80 seconds relaxation time. Usually an area of 0.5–1 optic disc diameter from the optic disc is analyzed by using special analyzing software. The test is conducted after pharmacological dilation of the patient's pupils; apart from applying these eyedrops, the examination is completely non-invasive and non-demanding for the person undergoing<unk> .
Retinal vessel analysis
Retinal birefringence scanning
Microperimetry
Eye testing using speckle
Fundus photography
Scanning laser ophthalmoscopy
Humphrey visual field analyser
Doppler optical coherence tomography