Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1998-02-17
1999-10-05
Manuel, George
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351212, A61B 314
Patent
active
059633000
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 the reflected light. Aperture sharing elements, such as "hot mirrors" (4) are used 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 of 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 the 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 used to compute the gaze angle (or, line-of-sight). A bright pupil on a dark background wil provide the pupil diameter measurement. The ocular biometer can be configured in a binocular manner so that both eyes can be investigated simultaneously for strabismus, stereopsis and convergence measurements. The depth of modulation of the modulated shadow pattern provides an indication of the acuity of the ocular media and the retinal surface thus providing a means for screening such medical anomalies as diabetic retinopathy, glaucoma and cataracts.
REFERENCES:
patent: 4125430 (1978-11-01), Rassow
patent: 4173398 (1979-11-01), Okamoto
patent: 4293198 (1981-10-01), Kohayakawa
patent: 4353625 (1982-10-01), Nohda
patent: 4372655 (1983-02-01), Matsumura
patent: 4376573 (1983-03-01), Matsumura
patent: 4390255 (1983-06-01), Nohda
patent: 4421391 (1983-12-01), Matsumura
patent: 4459027 (1984-07-01), Kafri
patent: 4640596 (1987-02-01), Humphrey
patent: 4650301 (1987-03-01), Humpnrey
patent: 4669835 (1987-06-01), Humphrey
patent: 4730917 (1988-03-01), Krueger
patent: 5157427 (1992-10-01), Humphrey
patent: 5164750 (1992-11-01), Adachi
patent: 5208619 (1993-05-01), Campbell
patent: 5223863 (1993-06-01), Heine
patent: 5252999 (1993-10-01), Sukigara
patent: 5258791 (1993-11-01), Penney
patent: 5270749 (1993-12-01), Okamura
patent: 5576780 (1996-11-01), Yancey
AMT Technologies, Corp.
Astor Sanford
Manuel George
LandOfFree
Ocular biometer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ocular biometer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ocular biometer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1177846