1. Articles in category: Ophthalmology

    11473-11496 of 11508 « 1 2 ... 476 477 478 479 480 »
    1. Tracking assisted optical coherence tomography

      One embodiment of the present invention is an optical coherence tomography ("OCT") application apparatus that performs an OCT application on an object. The OCT application apparatus includes: (a) an OCT scanning apparatus which outputs a scanning beam of OCT scanning radiation; and (b) an active tracking system that generates and projects a tracking beam of tracking radiation onto a region including a reference tracking feature; wherein the active tracking system further includes an analysis system that analyzes tracking radiation reflected from the region to detect movement of the object and to generate tracking signals, and applies the tracking signals (i ...
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    2. Optical Coherence Tomography of Ocular Diseases, Second Edition (Book)

      Optical Coherence Tomography of Ocular Diseases, Second Edition (Book)
      Optical Coherence Tomography of Ocular Diseases, Second Edition is a completely revised and updated version of this classic text. Incorporated within over 700 pages are a multitude of updated features unique to this edition including over 1,600 color images, state-of-the-art technology, and case presentations. These elements cohesively work together to successfully demonstrate the retina in normal and diseased states using the innovative Stratus OCTTM. Optical Coherence Tomography of Ocular Diseases, Second Edition is written with the clinician in mind. The text's primary objective is to illustrate the appearance of the eye in health and disease, comparing conventional clinical ...
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    3. Method of manufacturing customized intraocular lenses

      A method of manufacturing an intraocular lens that has been customized to provide optimum vision for an eye with prior corneal refractive surgery. Such a custom manufactured IOL will address not only optical correction requirements as currently met by spherical or toric-shaped IOLs, but will correct higher order optical aberrations using needed optimum customized shapes.
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    4. Method and apparatus for the simultaneous determination of surface topometry and biometry of the eye

      An apparatus (10') for detecting the surface topography of a cornea (24) of an eye (22) by dynamic or static projection of a pattern onto the surface of the cornea and detection of the pattern reflected by the cornea, providing preferably simultaneous detection of at least one optical property of a layer disposed beneath the cornea.
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      Mentions: Adolf F. Fercher
    5. Method and device configuration for determining the corneal thickness of an eye

      Proposed is a method and a device configuration for determining the corneal thickness of an eye, in particular of a human eye, by means of light rays. First light rays are projected onto and into the cornea, and second light rays, reflected by the cornea, are registered for determining the corneal thickness. A contact element, which is preferably plane-parallel, is placed on the contact area of the cornea, and the first light rays are projected through the contact element onto and into the cornea. The contact element is fixed on the cornea, for example. The first light rays are projected ...
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    6. Optical coherence tomography: evaluation and clinical application (Thesis)

      Optical coherence tomography: evaluation and clinical application (Thesis)
      The ability to examine the appearance of the retina is of paramount importance for the diagnosis and monitoring of ophthalmic disease and for the evaluation of treatment outcomes. Direct cross-sectional imaging of retinal structure could be useful for early diagnosis and more sensitive monitoring of a variety of retinal conditions such as macular oedema and glaucoma. The view of the fundus given by ophthalmoscopy provides very limited depth information and clinicians will often have to resort to additional techniques such as flourescein angiography or visual field testing for information on structural abnormalities within the retina. Other currently available imaging techniques ...
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    7. Method and apparatus for improving vision and the resolution of retinal images

      A method of and apparatus for improving vision and the resolution of retinal images is described in which a point source produced on the retina of a living eye by a laser beam is reflected from the retina and received at a lenslet array of a Hartmann-Shack wavefront sensor such that each of the lenslets in the lenslet array forms an aerial image of the retinal point source on a CCD camera located adjacent to the lenslet array. The output signal from the CCD camera is acquired by a computer which processes the signal and produces a correction signal which ...

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    8. Nondestructive Quantification of Analyte Diffusion in Cornea and Sclera Using Optical Coherence Tomography

      PURPOSE. Noninvasive functional imaging, monitoring, and quantification of analytes transport in epithelial ocular tissues are extremely important for therapy and diagnostics of many eye diseases. In this study the authors investigated the capability of optical coherence tomography (OCT) for noninvasive monitoring and quantification of diffusion of different analytes in sclera and cornea of rabbit eyes. METHODS. A portable time-domain OCT system with wavelength of 1310 ± 15 nm, output power of 3.5 mW, and resolution of 25 µm was used in this study. Diffusion of different analytes was monitored and quantified in rabbit cornea and sclera of whole eyeballs. Diffusion ...
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    9. System and method for determining birefringence of anterior segment of a patient's eye

      The magnitude and axial orientation of birefringence of the anterior and the posterior segments of the human eye are determined. The anterior segment includes essentially the combined birefringence of the cornea and the crystalline lens, and the posterior segment includes regions at the fundus. The optical axis and the magnitude of the birefringence of the anterior segment is first determined, then the birefringence of the posterior segment is nulled by a variable retarder. The birefringence of the posterior segment is then determined without interference of the birefringence of the anterior segment. The apparatus and method are applicable to the measurement ...
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    10. Retinal tracking assisted optical coherence tomography

      One embodiment of the present invention is an optical coherence tomography ("OCT") application apparatus that performs an OCT application on an object. The OCT application apparatus includes: (a) an OCT scanning apparatus which outputs a beam of OCT scanning radiation; (b) an active tracking system that generates and projects a beam of tracking radiation onto a region including a reference tracking feature, which active tracking system includes a tracking optical system that is disposed to intercept the beam of tracking radiation and the beam of OCT scanning radiation; and (c) wherein the active tracking system analyzes tracking radiation reflected from ...
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    11. Evaluation of macular holes by optical coherence tomography in Chinese patients

      Evaluation of macular holes by optical coherence tomography in Chinese patients

      Aim: To evaluate the diagnostic significance of optical coherence tomography for macular holes. Materials and methods: From October 1999 to February 2000, forty six eyes of 40 patients with clinically diagnosed or suspected macular holes had optical coherence tomography performed via dilated pupils in both eyes. All images were measured and analyzed. Results: The optical coherence tomography technique showed lamellar macular holes in 11 eyes of 9 patients with partial neural epithelium defect. The average remaining retinal thickness of the macular area was 108 mm (standard deviation, 42.5 mm). Thirty eyes of 27 patients had full-thickness macular holes. The ...

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    12. Method and apparatus for diagnosing and monitoring eye disease

      Embodiments of the present invention provide method and apparatus for diagnosing and monitoring eye disease such as, for example, glaucoma. In particular, embodiments of the present invention analyze OCT scans of a retina to determine one or more of the following measures for diagnosing and monitoring glaucomatous retinal nerve fiber layer ("NFL") change: an NFL thickness; a ratio of NFL thickness in a vertical quadrant (superior and inferior quadrants in an OCT scan are combined in a vertical average) and a horizontal quadrant (nasal and temporal quadrants in the OCT scan are combined in a horizontal average); and an NFL ...
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    13. Ocular microcirculation examination and treatment apparatus

      Ophthalmologic examination apparatus comprises a light source, illumination means for directing light from the source along an illumination path and into the fundus of an eye of a patient, imaging means for directing fluorescence from the fundus of the patient along an imaging path to enable an image of the eye to be viewed, wherein the illumination and imaging paths are arranged as a confocal microscope adapted to focus on the fundus of the eye. A method of diagnosis of disease in an eye of a patient comprises providing in the ocular circulation of the patient: a first dye which ...
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    14. Method and apparatus for recording three-dimensional distribution of light backscattering potential in transparent and semi-transparent structures

      An apparatus is disclosed for generating data representative of a three-dimensional distribution of the light backscattering potential of a transparent or semi-transparent object such as a human eye. The apparatus includes an interferometer, both the reference beam and measurement beam of which are directed toward the object and reflected by respective reference and measurement sites thereof, such that axial motion of the object during measurement affects both beams equally. The measurement beam is raster scanned transversely across each measurement site for which data is obtained. Also, the frequency of one of the beams is shifted by a non-moving frequency shifter ...
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    15. Method and apparatus for improving vision and the resolution of retinal images

      A method of and apparatus for improving vision and the resolution of retinal images is described in which a point source produced on the retina of a living eye by a laser beam is reflected from the retina and received at a lenslet array of a Hartmann-Shack wavefront sensor such that each of the lenslets in the lenslet array forms an aerial image of the retinal point source on a CCD camera located adjacent to the lenslet array. The output signal from the CCD camera is acquired by a computer which processes the signal and produces a correction signal which ...

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    16. Process and arrangement for examining a section of the eye

      Systems, methods, and apparatus are provided for deriving the relative position of an eye by tracking a boundary of the eye such as the limbus (i.e., the interface between the white sclera and the colored iris). A technique for tracking the position of the eye of patient comprises directing light to an annular region of the eye between the sclera and the iris and receiving reflected light from that region. The intensity of the reflected light is then measured to determine a relative position of the eye. In some embodiments, the measured region is scanned around the boundary. In ...
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    17. Kinetic acoustic ocular examination apparatus and method

      Soft tissue examination apparatus and method employ an ultrasonic transducer system for generating a series of ultrasound pulses, at least one of which is of sufficiently high intensity to induce physical displacement of the soft tissue. The transducer receives a series of ultrasonic echo pulses and responsively generates a series of data signals indicative of such tissue displacement. A data processor receives the data signals and determines the magnitude of the displacement. In such a manner, the present invention assists in the evaluation and/or diagnosis of biological tissue. Preferably, the apparatus and method of this invention is employed to ...
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    18. Corneal Topography: A review, new ANSI standards and problems to solve

      Corneal Topography: A review, new ANSI standards and problems to solve
      This review of corneal topography has three sections: 1. a brief introduction to how corneal topography instruments work. A quantitative comparison of the relative accuracy of slope based and position based instruments is presented. 2. a summary of and commentary on the newly issued ANSI standards for corneal topography. 3. an examination of problems still facing corneal topography
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    19. Optical coherence tomography assisted surgical apparatus

      Ophthalmologic surgical microscope which is combined internally with an optical coherence tomography ("OCT") apparatus wherein auto-focusing is provided by driving a motorized internal focusing lens of the ophthalmologic surgical microscope with a signal output from the OCT apparatus. An embodiment of the inventive ophthalmologic surgical microscope includes: (a) an optical coherence tomography ("OCT") apparatus; (b) a beamcombiner for internally coupling output from the OCT apparatus into the ophthalmologic surgical microscope; and (c) a motor for moving an internal focusing lens of the ophthalmologic surgical microscope in response to a signal from the OCT apparatus, whereby the ophthalmologic surgical microscope is ...
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    20. Retinal nerve fiber layer thickness predicts brain atrophy in MS patients

      The thickness of the retinal nerve fiber layer (RNFL), as measured by optical coherence tomography (OCT), correlates with brain atrophy in patients with multiple sclerosis (MS), according to a new report. The thickness of the retinal nerve fiber layer (RNFL), as measured by optical coherence tomography (OCT), correlates with brain atrophy in patients with multiple sclerosis (MS), according to a report in the October 16th issue of Neurology. "This is a promising, inexpensive tool that images CNS nerve fibers," Dr. Peter A. Calabresi from Johns Hopkins School of Medicine, Baltimore, Maryland told Reuters Health. "It may be very useful to ...
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    21. Method and apparatus for simultaneously measuring the length and refractive error of an eye

      Embodiments of the present invention are method and apparatus for simultaneously measuring the length and refractive error of an eye, preferably in a non-contact mode. In particular, an embodiment of the present invention is an apparatus which measures length and refractive error of an eye which includes: (a) a source of short coherence radiation which couples radiation into a Michelson interferometer, the arms of the Michelson interferometer having a predetermined optical pathlength difference; (b) an injector which couples radiation output from the interferometer into the eye; and (c) a relay system which couples radiation output from the eye to a ...
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    22. Optical mapping apparatus with adjustable depth resolution

      Optical mapping apparatus with adjustable depth resolution is provided. The optical mapping apparatus can display transversal images in an object, particularly the eye. The apparatus can deliver two or more images with different depth resolutions, or a combination of these images, or only one image with adjustable depth resolution. There is also provided optical mapping apparatus with adjustable depth resolution, where OCT images are corrected for the curvature at the back of the eye lens.
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    11473-11496 of 11508 « 1 2 ... 476 477 478 479 480 »
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