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      Photo-Cell Device for Slit-Beam Adjustment to the Optical Axis of the Eye in Scheimpflug Photography


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          In the photographic documentation of lens findings according to Scheim-pflug’s principle, a good reproducibility of the camera adjustment to the patient’s eye is prerequisite for quantitative densitometric evaluations. To ensure reproducible adjustment, the camera was equipped with a green blinking target for patient fixation, and with two phototransistors. These are stimulated by the slit light reflected from the patient’s cornea and trigger an acoustical signal when the slit beam is perpendicular. When the patient fixates the target light, and the pitch of the acoustical signal indicates a perpendicular alignment, the slit passes through the optical axis of the eye. Such adjustment makes it possible to take photos of a reproducible central optical section of the lens.

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          Author and article information

          Ophthalmic Res
          Ophthalmic Research
          S. Karger AG
          03 December 2009
          : 12
          : 2
          : 78-86
          Abteilung Biochemie des Auges, Klinisches Institut für experimentelle Ophthalmologie der Universität, Bonn
          265066 Ophthalmic Res 1980;12:78–86
          © 1980 S. Karger AG, Basel

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          : 24 August 1979
          : 11 October 1979
          Page count
          Pages: 9
          Original Paper

          Vision sciences,Ophthalmology & Optometry,Pathology
          Follow-up lens photography,Scheimpflug photography,Reproducibility in lens photography,Cataract documentation,Slitbeam adjustment


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