System and method for non-contacting measurement of the eye

System and method for non-contacting measurement of the eye

A longitudinal section through the human eye is shown schematically in FIG. . The axial length AL of the human eye is usually measured by a contact ultrasound method. Other measuring methods are described in DE 3201801, U.S. Pat. No. 5673096 and DE 4446183 Al. The curvature of the cornea-cornca radi...

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Bibliographische Detailangaben
Hauptverfasser: Barth, Roland, Bergner, Roland, Mueller, Lothar, Steinmetz, Dietmar, Schubert, Siegfried, Voigt, Klaus-Ditmar, Behrendt, Frank, Dietzel, Burkhard, Doering, Axel
Format: Patent
Sprache:eng
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Zusammenfassung:A longitudinal section through the human eye is shown schematically in FIG. . The axial length AL of the human eye is usually measured by a contact ultrasound method. Other measuring methods are described in DE 3201801, U.S. Pat. No. 5673096 and DE 4446183 Al. The curvature of the cornea-cornca radius HHR is determined by means of known keratometers/ophthalmometers (DD 251497, U.S. Pat. Nos. 4,572,628, 4,660,946, 5,212,507, 5,325,134). The measurement of the anterior chamber depth VKT can be carried out by ultrasound or by means of a unit added to a slit lamp (anterior chamber depth gauge, adjustment via the slit lamp image). Combined equipment for non-contacting determination of axial length (AL), anterior chamber depth (VKT) and corneal curvature (HHK) of the eye are also important for the selection of the intraocular lens IOL to be implanted, particularly the selection of an intraocular lens IOL to be implanted, preferably with fixation of the eye by means of a fixating lamp and/or illumination through light sources grouped eccentrically about the observation axis.