From Big Medical Encyclopedia

KERATOGRAFIYA (Greek keras, keratos a horn, horn substance + grapho to write, represent; synonym fotokeratografiya) — a research of a form of a cornea by photography of the images reflected from its surface — concentric rings or parallel strips.

Samples keratogramm: 1 — at a normal cornea; 2 — at a keratoconus (disturbance of parallelism of concentric rings is noted).

To. it is applied to diagnosis of disturbances of sphericity of a cornea owing to various patol, processes and as a control method at refraction operations on a cornea. At the same time on a keratogramma disturbance of a form of rings or parallelism of strips or change of distance between rings or strips (fig.) is noted.

Further development To. the fotokeratometriya is, edges allows to define topography of a front surface of a cornea. Fotokeratometriya is applied to calculation of a form of an individual contact lens, and also to assessment of dynamics of pathological changes of a cornea at her various diseases.

Bibliography: Dashevsky A. I. New methods of studying of optical system of an eye and development of its refraction, Kiev, 1956; Shayer E. G. Use of the photo in medicine, M., 1974, bibliogr.; Der Augenarzt, hrsg. v. To. Velhagen, Bd 2, S. 33, Lpz., 1959; D e k k i n g H. M. Zur Photo-graphie der Hornhautoberflache, Albrecht v. Graefes Arch. Ophthal., Bd 124, S. 708, 1930; Sampson W. G., S o p e r J. W. a. Girard L. J. Topographical keratometry and contact lenses, Trans. Amer. Acad. Ophthal. Otolaryng., v. 69, p. 959, 1965.

E. I. Kowalewski.