Scheiner's optometer
The Scheiner optometer (after Christoph Scheiner ) is a measuring instrument for calculating the width of accommodation of the eye.
To do this, the patient is placed in front of an optical bench and a "tab" (for example a piece of wire) is moved along this bench. If you move the rider closer to the eye, it will appear out of focus at some point, as the refractive power of the eye is no longer sufficient to produce a sharp image. The distance at which the patient can just barely see a sharp image (rider) is limited by the near point of accommodation .
To determine the far point , a lens of known refractive power (convex lens, usually +10 diopters ) must be fitted in front and then the rider must be moved further and further away from the eye. At some point the patient can no longer see the rider clearly.
Individual evidence
- ↑ Bernd Lachenmayr, Dieter Friedburg, Erwin Hartmann , Annemarie Buser: Eye - Glasses - Refraction. Schober course: Understanding - learning - applying. 4th, revised edition. Thieme, Stuttgart et al. 2006, ISBN 3-13-139554-0 , p. 33 ff., Here online .
- ↑ meb.uni-bonn.de: VERSUCHE 6.1.1 Determination of the accommodation width , pdf ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
