Detection of an eyes own vibration modes uses laser interferometer includes use for measuring intra-ocular pressure, uses short focal length (less than 30 mm) convergent correction lens

摘要

Between the eye and reflective part (M1) is convergent correction lens (8) centered on the optical axis (A1) which reduces the sensitivity due to lateral misalignment of the eye with respect to the principal optical axis. The correction lens has short focal distance preferably less than 30 mm. A test card (9) is positioned in the Perot-Fabry cavity and centered on axis (A1), the eye is aligned laterally with respect to axis so that the test card seen by the eye is not deformed. . Method for detection of the eyes own vibration mode by laser interferometer. The eye (3) is positioned with respect to a sensor (1) so as to form with it a Perot-Fabry cavity with principal axis (A1) and having two opposite reflective faces along the axis. One (M1) of the two faces is fixed and reflective, the other is formed by the cornea (2). Injected into the cavity an incident laser beam (F) centered on the optical axis (A1) of the cavity. The lateral and longitudinal alignments of the cornea with respect to the axis (A1) is done so as to produce longitudinal interference between the laser forward and return beam reflected between the two reflective faces of the cavity. An opto-electronic detector (7) measures the intensity (I) during the interference time. Independent Claims are included for measuring device.