EP 1971253 A1 20080924 - CORNEAL TOPOGRAPHY APPARATUS WITH FURTHER INTEGRATED DEVICES
Title (en)
CORNEAL TOPOGRAPHY APPARATUS WITH FURTHER INTEGRATED DEVICES
Title (de)
HORNHAUTTOPOGRAPHIEGERÄT MIT WEITEREN INTEGRIERTEN VORRICHTUNGEN
Title (fr)
APPAREIL DE TOPOGRAPHIE CORNÉENNE À DISPOSITIFS SUPPLÉMENTAIRES INTÉGRÉS
Publication
Application
Priority
IB 2005003061 W 20051014
Abstract (en)
[origin: WO2007042854A1] An apparatus for corneal topographic analysis, determining the precise curvature of a cornea and the position of the optical axis giving a map of such curvature to an operator, and also for pupillometric analysis, determining the pupil contour and the relative centre both in steady and dynamic conditions during transients of contraction (passage from scotopic to photopic condition) and dilation (passage from photopic condition to scotopic), and/or for a real analysis by fluoresceine by testing a contact lens fitting on a cornea. The apparatus comprises a measuring head (6) having a Placido disc (2) backlighted with a light source (31), suitable for causing the pupil to contract. Coaxial to the disc (2) a videocamera (10) is mounted, comprising an optical unit (11) for focusing on a shot image. The measuring head (6) comprises a plurality of infrared LEDs, for example respectively four LEDs (14, 15, 16, 17), suitable for lighting the eye in a way suitable not to disturb the aperture of the pupil and two visible light LEDs (18, 19) arranged on the Placido disc (2) suitable for causing the contraction of the pupil. The head (6) comprises also a visible light fixation LED (13), incident on a beam splitter (12) inclined suitable to align the eye (23) with respect to the videocamera (10). The head (6) may comprise two LEDs (95 and 96) that emit light in the spectrum of excitation of fluoresceine, previously arranged between a cornea and a contact lens, and a yellow fixed filter (100) mounted on said lamina (12), suitable for causing only the light of interest for the analysis to pass towards the videocamera (10).
IPC 8 full level
A61B 3/107 (2006.01); A61B 3/11 (2006.01); A61B 3/14 (2006.01); A61B 3/15 (2006.01); A61B 3/18 (2006.01)
CPC (source: EP)
A61B 3/107 (2013.01); A61B 3/112 (2013.01); A61B 3/152 (2013.01); A61B 3/0008 (2013.01)
Citation (search report)
See references of WO 2007042854A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK YU
DOCDB simple family (publication)
WO 2007042854 A1 20070419; EP 1971253 A1 20080924; EP 2016888 A1 20090121
DOCDB simple family (application)
IB 2005003061 W 20051014; EP 05805155 A 20051014; EP 08008897 A 20051014