Optometer

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Stampfer's optometer
The illustration shows the influence of the lens on the refractive power of the eye.

In medicine, an optometer is a device that can be used to determine the refractive power of the eyes and their range of vision . The distance and near point serve as the basis, i.e. the distance to an object at which it can just be seen clearly (see also: Accommodation ). The far point is at infinity for the normal sighted. With the additional use of lenses placed in the beam path, it can be moved to a finite distance and thus a measurable result can be achieved.

Different types of optometers have been developed, including those according to Christoph Scheiner ( Scheiner's optometer ), Thomas Young , Simon Stampfer and Franciscus Cornelis Donders, as well as the color optometer.

Individual evidence

  1. ↑ a b Josef Frick: The physical technology or instructions for setting up physical experiments and for producing physical apparatus with the simplest possible means. 2nd, increased and improved edition. Vieweg and Son, Braunschweig 1856, p. 240, online .
  2. ↑ Optometer . In: Meyers Großes Konversations-Lexikon . 6th edition. Volume 15, Bibliographisches Institut, Leipzig / Vienna 1908, p.  87 .
  3. ↑ A. Burow Sen .: A new optometer. Hermann Peters, Berlin 1863, p. 5 ff., Online .
  4. ^ Johann Müller : Textbook of Physics and Meteorology. Volume 1. 6., revised and increased edition. Vieweg and Son, Braunschweig 1862, p. 669, online in the Google book search.