Title:
【発明の名称】眼バイオメータ
Document Type and Number:
Japanese Patent JP2003526404
Kind Code:
A
Abstract:
An ocular biometer utilizing a light emitting source (7) and corresponding optics to illuminate areas of the eye in order to analyze the wavefront of t he reflected light. Aperture sharing elements, such as "hot mirrors" (4) are us ed to allow the eyes (1) to view the world, as the ocular biometer measures various characteristics of the eye such as the refractive (i.e., accommodative) state, the gaze angle and the pupil diameter at any instant o f time and continuously. Optical wavefront conditioning and wavefront sensing techniques are used to determine the refractive power of the eye and the instantaneous accommodative state. Reflected light is projected through a reticle (26) or plurality of reticles (26, 28). Spatial characteristics of t he resulting shadow pattern uniquely determine the characteristics of the eye. These shadow patterns can be measured directly or by causing a modulation of the lines with a second identical reticle placed appropriately between the first and the imaging plane. The bright pupil and a Purkinje image may be us ed to compute the gaze angle (or, line-of-sight). A bright pupil on a dark background will provide the pupil diameter measurement. The ocular biometer can be configured in a binocular manner so that both eyes can be investigate d simultaneously for strabismus, stereopsis and convergence measurements. The depth of modulation of the modulated shadow pattern provides an indication o f the acuity of the ocular media and the retinal surface thus providing a mean s for screening such medical anomalies as diabetic retinopathy, glaucoma and cataracts.
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Inventors:
Howitz, Larry, S
Application Number:
JP2001511810A
Publication Date:
September 09, 2003
Filing Date:
July 27, 1999
Export Citation:
Assignee:
AMT Technologies, Corporation
International Classes:
A61B3/113; A61B3/10; A61B3/103; A61B3/107; (IPC1-7): A61B3/113; A61B3/10
Domestic Patent References:
| JPH09122075A | 1997-05-13 | |||
| JPH10272100A | 1998-10-13 | |||
| JPH01124434A | 1989-05-17 |
Foreign References:
| WO1992001417A1 | 1992-02-06 |
Attorney, Agent or Firm:
Akira Asamura (3 outside)