technology

  • Laser Doppler
  • Velocimetry
  • Flowmetry

devices

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Y-YBAR is producing medical devices for the research in ophthalmolgy. these devices -based on laser doppler flowmetry- measure relative choroidal blood flow. if you are conducting research in vascular system of the eye, for example in the case of glaucoma, if you need an objective criterion to measure the effect of your vascular treatment, if you want to know the effect of your drug on choroidal blood flow then our devices are for you.


Specifications:

Instrument

  • Size : 30cm x 26cm x 6cm
  • weight: 3.3 kg
  • The instrument can be mounted on an existing slit-lamp
  • Power consumption with the automated aquisition device: 5.3W

Subject

  • The instrument required a cooperative subject who is asked to look at a faint point
  • No pupil dilatation is required
  • Ammetropia within +/- 2.5 Diopters

Probing light

  • Wavelength: 795nm
  • Intensity: 100 μW
  • Beam diameter at the pupil: 1.3 mm

Probing intensity

  • less than 100 μW (micro-watt)

Optical principle

  • Schlieren: the illumination spot is excluded from the detected scattered light.

Ammetropia correction

  • +/- 2.5 Diopters

Data Analysis

The instrument delivers an electrical signal, which is analysed by another system made by Oculix Inc or by the Haute Ecole Valaisanne.

References

The actual instrument is derived from the one described in the following publication. It has the same optical arrangement but another mechanical support: Compact instrument for Laser Doppler velocimetry. Geiser MH, Diermann U, Riva CE. Biomedical Optics, Journal of Biomedical Optics, October 1999, Volume 4, Issue 4, pp. 459–464