The Tuebingen Scotopic Threshold Test (TSTT)

Measurement of the dark-adaptation threshold plays a key role in the diagnosis and estimation of the disease progression of many retinal disorders. Determining the threshold is, however, difficult to perform in young children. We developed a prototype for a dark adaptometer, the Tuebingen Scotopic Threshold Test aimed to ease the measurement of photoreceptor sensitivity thresholds in young subjects. The device consists of two 7 cm × 10 cm fields with either blue or yellow LEDs, for testing rod or cone sensitivity, respectively. Presentation of homogenous field patterns or a flickering stimulus is also possible. The luminance threshold is measured by the method of ascending limits and the stimulus luminance, data recording, and analysis are computer-controlled.


  1. Torsten Strasser, Hana Langrová, Anne Kurtenbach, Ditta Zobor, Dominic Hillerkuss, and Eberhart Zrenner. 2013. “Quick and Easy Light Sensitivity Assessment of the Dark Adapted Eye: The Tuebingen Scotopic Threshold Test (TSTT).” In Investigative Ophthalmology & Visual Science, 54:3015.
  2. Torsten Strasser, Hana Langrova, Sabrina Sundermeier, Dominic Hillerkuss, Katarina Stingl, Wilhelm Durst, Anne Kurtenbach, Eberhart Zrenner, and Ditta Zobor. 2018. “The Tuebingen Scotopic Threshold Test (TSTT).” IEEE Journal of Biomedical and Health Informatics 22 (2): 607–10. doi:10.1109/JBHI.2017.2648891.