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QuaSA - Quantitative light scatter analysis on eye

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Project description

Effects of operations at anterior parts of the eye shall be visualized with a novel method of measurement. At a follow-up examination the operation success is as important as unwanted side effects like the increment of stray light.  Especially the stray light disturbs the patient, for example by glare effects while driving car at night. The real degree of exposure is normally unknown for the doctor, because he can only see from outside into the patient eye. With the new developed device groundwork is laid to quantify and visualize the real stray light exposure spatially. Heart of the laboratory demonstrator is a Hartmann-Shack-Wavefront-Sensor for analysis of aberrations of the eye, in combination with a multifunctional, programmable aperture in form of a reflective display. Using this display enables the selection of those parts of light, which can be assigned to the stray light from the anterior part of the eye. Concerning this a patent was applied for and at the international trade fair iENA-2011 awarded with a silver medal.

Schematic diagram of the measurement system
laboratory setup of QuaSa

Publications & patents


  • S. Schramm, B.-U. Seifert, und D. Link, „Influence of the Shell Structure of the Human Lens on Accommodation Using Ray Tracing“, ARVO Meeting Abstracts, Bd. 51, Nr. 5, S. 790, Apr. 2010
  • S. Schramm, P. Schikowski, M. Reder, K. Kunert, und B. U. Seifert, „Plausibility of Stray Light Measurement with a modified Wavefront Analyzer“, ARVO Meeting Abstracts, Bd. 52, Nr. 6, S. 6217, Apr. 2011
  • S. Schramm und B.-U. Seifert, „Streulichtmessung mit Hartmann-Shack-Sensor am Auge“, in DGaO-Proceedings, 2011.B.-U. Seifert, S. Schramm, P. Bessler, P. Schikowski, und K. S. Kunert, „Clinical Validation of a Modified Wavefront Analyzer - Preliminary Results“, ARVO Meeting Abstracts, Bd. 51, Nr. 5, S. 3948, Apr. 2010
  • B. U. Seifert, P. Schikowski, K. S. Kunert, M. Reder, und S. Schramm, „Enhanced Feature Segmentation and Data Extraction in Pentacam Scheimpflug Images“, ARVO Meeting Abstracts, Bd. 52, Nr. 6, S. 5707, Apr. 2011
  • K. S. Kunert u. a., „Presbyopia is the First Stage of Nuclear Cataract-Analysis of Forward and Backward Scattered Straylight in the Presbyopic Human Lens“, ARVO Meeting Abstracts, Bd. 52, Nr. 6, S. 826, Apr. 2011.
  • M. P. Reder u. a., „Analysis of Optical Side Effects of fs-Laser Therapy in the Human Presbyopic Lens Simulated With Modified Contact Lenses“, ARVO Meeting Abstracts, Bd. 52, Nr. 6, S. 6215, Apr. 2011.
  • Monika Peter, M.Sc.1, Robert Kammel, Dipl.-Phys.2, Roland Ackermann, PhD2, Stephanie C Bühren, Dipl.-Ing. (FH)2, Stefan Schramm, Dipl.-Ing.3, Bernd-Ulrich Seifert, Dipl.-Ing.3, Katharina Frey, M.Sc.4, Kathleen S Kunert, MD1 „Analysis of optical side effects of fs-laser therapy in human presbyopic lens simulated with modified contact lenses“

Patent Applications:

  • „Programmable multifunctional aperture for the analysis of optical systems“ (DE 10 2011 102 176 A1)

silver medal at the iENA2011
silver medal of the „Salon International des Inventions, Genéve 2012“