Jaeger chart

The Jaeger chart is an eye chart used in testing near vision acuity. It is a card on which paragraphs of text are printed, with the text sizes increasing from 0.37mm to 2.5mm.[1] This card is to be held by a patient at a fixed distance from the eye dependant on the J size being read. The smallest print that the patient can read determines their visual acuity.[2]

The original 1867 chart had a text containing seven paragraphs and a corresponding seven-point scale.[3]

Distance vision acuity is tested using the Snellen chart, familiarly seen wall mounted with a large letter at the top.

References

  1. ↑ Blesi, Michelle; Wise, Barbara; Kelley-Arney, Cathy (2011). Medical Assisting Administrative and Clinical Competencies. Cengage Learning. pp. 888–890.
  2. ↑ G.K. & Pal; Pal; Pravati (1 February 2006). Textbook Of Practical Physiology - 2Nd Edn. Orient Blackswan. pp. 328–. ISBN 978-81-250-2904-5.
  3. ↑ Khurana (2008). Theory and Practice of Optics and Refraction. Elsevier India. p. 49.
This article is issued from Wikipedia - version of the Wednesday, January 27, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.