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Br J Ophthalmol 1988;72:228-230 doi:10.1136/bjo.72.3.228
  • Research Article

Image size in the fundus: structural evidence for wide-field retinal magnification factor.

  1. A L Holden and
  2. F W Fitzke
  1. Department of Visual Science, Institute of Ophthalmology, London.

      Abstract

      A simple geometrical method is described of calculating the retinal magnification factor (micrometres/degree) at the ora serrata of the human eye. At the ora the magnification factor is some 176 microns/deg., whereas at the posterior pole it is 276 microns/deg. This result may be of clinical use in examinations where dimensions of tears and holes near the ora serrata are estimated.

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