1. Articles in category: Ophthalmology

    11713-11736 of 12085 « 1 2 ... 486 487 488 489 490 491 492 ... 502 503 504 »
    1. Ultra-high resolution adaptive optics: optical coherence tomography for in vivo imaging of healthy and diseased retinal structures

      Ultra-high isotropic resolution imaging of retinal structures was made possible with an adaptive optics system using dual deformable mirrors and a Fourier-domain optical coherence tomography (Fd-OCT) system with correction for longitudinal chromatic aberration. This system was used to image microsco ... [Proc. SPIE Int. Soc. Opt. Eng. 6844, 684408 (2008)] published Mon Feb 11, 2008.
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    2. In vivo imaging of raptor retina with ultra high resolution spectral domain optical coherence tomography

      Among birds, raptors are well known for their exceptional eyesight, which is partly due to the unique structure of their retina. Because the raptor retina is the most advanced of any animal species, in vivo examination of its structure would be remarkable. Furthermore, a noticeable percentage of traumatic ocular injuries are identified in birds of prey presented to rehabilitation facilities. Injuries affecting the posterior segment have been considered as a major impact on raptor vision. Hence, in vivo examination of the structure of the posterior segment of the raptors would be helpful for the diagnosis of traumatized birds. The purpose ...

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    3. Assessment of the Scleral Spur in Anterior Segment Optical Coherence Tomography Images

      Objective  To assess visibility of the scleral spur in anterior segment optical coherence tomography (AS-OCT) images. Methods  This cross-sectional observational study included 502 participants aged 50 years or older who had no previous ophthalmic problems and were recruited from a community clinic in Singapore. All participants underwent gonioscopy and AS-OCT (Visante; Carl Zeiss Meditec, Dublin, California). Scleral spur location was assessed in AS-OCT images by 2 examiners with glaucoma subspecialty training and was defined as the point where there was an inward protrusion of the sclera with a change in curvature of its inner surface. Results  Scleral spur location could ...

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    4. Slitlamp-Optical Coherence Tomography-Guided Needling of Failing Filtering Blebs

      Slitlamp–Optical Coherence Tomography–Guided Needling of Failing Filtering Blebs Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings. Slitlamp anterior segment optical coherence tomography (SL-OCT)^ (Heidelberg Engineering, Heidelberg, Germany) allows for direct^ imaging of filtering blebs after trabeculectomy and can be used^ to assess the internal anatomy and function of these blebs.^ Needling with subconjunctival injecti
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    5. Use of optical coherence tomography to measure prevalence of epiretinal membranes in patients referred for cataract surgery.

      Related Articles [Use of optical coherence tomography to measure prevalence of epiretinal membranes in patients referred for cataract surgery.] Arch Soc Esp Oftalmol. 2008 Feb;83(2):89-94 Authors: Contreras I, Noval S, Tejedor J PURPOSE: To evaluate, using optical coherence tomography (OCT), the prevalence of epiretinal membranes (ERM) in patients referred for phacoemulsification, and the frequency of new ERM development in the first six months after surgery. METHODS: Patients referred by general ophthalmologists for cataract surgery underwent a new, complete ophthalmological evaluation. OCT scanning was performed using the Macular Thickness Map acquisition protocol (StratusOCT, Carl Zeiss Meditec). This baseline ...
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    6. Correlation Of Pathologic Features In Spectral Domain Optical Coherence Tomography With Conventional Retinal Studies.

      We delineated pathologic features within three-dimensional spectral domain optical coherence tomography volumes and projected marked sites of pathologic features onto clinically useful two-dimensional localization maps to be overlaid on conventional clinical images.Page: 298DOI: 10.1097/IAE.0b013e3181567798Authors: STOPA, MARCIN MD *+; BOWER, BRADLEY A. BSE +++; DAVIES, Emily BS *; IZATT, JOSEPH A. PhD *++; TOTH, CYNTHIA A. MD *++
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    7. Early Macular Morphological Changes Following Plaque Radiotherapy For Uveal Melanoma.

      Optical coherence tomography (OCT) evidence of radiation-induced macular edema can be found as early as 4 months following plaque radiotherapy of uveal melanoma. OCT changes are apparent before clinical signs of classical radiation maculopathy and before substantial visual deterioration occurs. The development of macular edema is significantly associated with larger initial tumor size.Page: 263DOI: 10.1097/IAE.0b013e31814b1b75Authors: HORGAN, NOEL MD; SHIELDS, CAROL L. MD; MASHAYEKHI, ARMAN MD; TEIXEIRA, LUIZ F. MD; MATERIN, MIGUEL A. MD; SHIELDS, JERRY A. MD
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    8. Performance of a MEMS-based AO-OCT system

      Adaptive optics (AO) and optical coherence tomography (OCT) are powerful imaging modalities that, when combined, can provide high-resolution, 3-D images of the retina. The AO-OCT system at UC Davis has been under development for 2 years and has demonstrated the utility of this technology for microsc ... [Proc. SPIE Int. Soc. Opt. Eng. 6888, 68880G (2008)] published Fri Feb 8, 2008.
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    9. Compact MEMS-based adaptive optics: optical coherence tomography for clinical use

      We describe a compact MEMS-based adaptive optics (AO) optical coherence tomography (OCT) system with improved AO performance and ease of clinical use. A typical AO system consists of a Shack-Hartmann wavefront sensor and a deformable mirror that measures and corrects the ocular and system aberrations. Because of limitations on current deformable mirror technologies, the amount of real-time ocular-aberration compensation is restricted and small in previous AO-OCT instruments. In this instrument, we incorporate an optical apparatus to correct the spectacle aberrations of the patients such as myopia, hyperopia and astigmatism. This eliminates the tedious process of using trial lenses in clinical ...
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    10. Optical coherence tomography findings in autosomal dominant macular dystrophy.

      Related Articles Optical coherence tomography findings in autosomal dominant macular dystrophy. Ophthalmic Surg Lasers Imaging. 2008 Jan-Feb;39(1):69-72 Authors: Schadlu R, Shah GK, Prasad AG The authors report a case of autosomal dominant cystoid macular dystrophy in which optical coherence tomography outlined the pathology and assisted in determining the etiology of the patient's macular edema. PMID: 18254357 [PubMed - in process]
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    11. OCT findings in macular hole formation in eyes with complete vitreofoveal separation.

      The current study describes the morphologic macular features in two eyes that developed full-thickness macular holes in the setting of documented vitreofoveal separation. Using third-generation optical coherence tomography, complete vitreofoveal separation associated with the disruption of the inner foveal retina was documented in both cases. Five months after presentation, decreased vision and epiretinal membrane formation associated with development of a full-thickness macular hole were observed in the first patient. In the second patient, a full-thickness macular hole was demonstrated by optical coherence tomography 6 weeks after presentation. These findings suggest that full-thickness macular holes may develop in eyes with vitreofoveal ...
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    12. Optical coherence tomography characteristics of epiretinal membranes in neurofibromatosis.

      Neurofibromatosis 2 is a neurocutaneous disorder that demonstrates unique ophthalmic manifestations. Several authors have noted a higher than expected incidence of epiretinal membranes in this population. In this brief case series, the authors document a series of optical coherence tomography (OCT) scans performed on three patients with neurofibromatosis 2 that demonstrated epiretinal membranes with atypical and distinctive characteristics. The membranes were unusually thick, with rolled edges extending into the vitreoretinal interface. The appearance of these membranes was distinct enough to establish a pattern. In one case, the unique OCT findings were the sole reason that the diagnosis of neurofibromatosis 2 ...

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    13. Parry-Romberg syndrome studied by optical coherence tomography.

      A case of Parry-Romberg syndrome that was studied by fluorescein angiography and optical coherence tomography (OCT) is described. OCT revealed the existence of retinal nerve fiber layer edema and abnormalities of the vitreoretinal interface. The presence of diffused retinal edema throughout the papillomacular area and the formation of thick retinal folds with intraretinal diffuse macular edema were also evident. Fluorescein angiography demonstrated optic disc swelling, engorgement of the retinal vessels, and mottling of the pigment epithelium. The retinal nerve fiber layer edema and the hyperreflectivity of the retinal surface indicate abnormalities and thickening of the vitreoretinal interface, as shown on ...
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    14. Ophthalmic OCT CPT 92135 Reimbursement Guide

      Ophthalmic OCT CPT 92135 Reimbursement Guide
      This reimbursement guide addresses specifically the Medicare reimbursement and documentation requirements for billing ocular coherence tomography (OCT) as it relates to the Spectralis. Providers should note that appropriate ICD-9-CM diagnosis codes are required to substantiate medical necessity when billing these services. As with any service billed to Medicare, providers are encouraged to check with their local Medicare carrier for specific billing and documentation guidelines.
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    15. Optical coherence computed tomography

      Li Li and Lihong V. Wang We proposed a novel time-resolved optical tomography, optical coherence computed tomography. It married the key concepts of time-resolved diffuse optical tomography and optical coherence tomography. Both ballistic and multiple-scattered photons were measured at multiple source-detection positions by ... [Proc. SPIE Int. Soc. Opt. Eng. 6855, 68550H (2008)] published Wed Feb 6, 2008.
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    16. High sensitive measurement of the human axial eye length in vivo with Fourier domain low-coherence interferometry

      In this paper we present a system for intraocular distance measurement of the human eye in vivo with high sensitivity. The instrument is based on Fourier domain low coherence interferometry (FD-LCI). Stateof-the-art FD-LCI systems are limited to a depth range of only a few mm, because the depth range is determined by the spectral resolution of the spectrometer. To measure larger distances (e.g. human eye length) we implemented two separate reference arms with different arm lengths into the interferometer. Each reference arm length corresponds to a different depth position within the sample (e.g. cornea and retina). Therefore two ...

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    17. Association Between Abnormal Autofluorescence and Photoreceptor Disorganization in Retinitis Pigmentosa.

      PURPOSE: To evaluate the association between the third high-reflectance band on high-resolution optical coherence tomography (OCT), fundus autofluorescence (AF), and kinetic perimetry results in patients with typical retinitis pigmentosa (RP). DESIGN: Retrospective, observational case series. METHODS: Thirty-four patients with typical RP who were referred to our institute were examined, with a diagnosis made by full-field electroretinography. We evaluated the fundus AF and the third high-reflectance band by high-resolution OCT, both qualitatively and quantitatively. We investigated whether the vertical length of the AF diameter or the third high-reflectance band correlated with Goldmann kinetic perimetry results. RESULTS: We classified three types of ...
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    18. Corneal profile analysis after Descemet stripping endothelial keratoplasty and its relationship to postoperative hyperopic shift.

      PURPOSE: To evaluate changes in the corneal profile after Descemet stripping endothelial keratoplasty (DSEK) using anterior segment optical coherence tomography (AS-OCT) analysis and to describe its relationship to a dynamic postoperative hyperopic shift. SETTING: John A. Moran Eye Center, University of Utah, Salt Lake City, USA. METHODS: In this retrospective observational study, 9 eyes had DSEK and were followed with manifest refractions and AS-OCT analysis. To assess changes in the thickness of the cornea, measurements for each AS-OCT image were taken at the vertex of the cornea, at 1.5 mm on each side of the vertex, and at the ...
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    19. Retinal pigment epithelial tears after single administration of intravitreal bevacizumab for neovascular age-related macular degeneration.

      Retinal pigment epithelial tears after single administration of intravitreal bevacizumab for neovascular age-related macular degeneration. Eye. 2008 Feb 1; Authors: Gelisken F, Ziemssen F, Voelker M, Bartz-Schmidt KU, Inhoffen W PurposeTo analyse retinal pigment epithelial (RPE) tears following single administration of intravitreal bevacizumab for neovascular age-related macular degeneration (AMD) during early follow-up.MethodsInterventional, retrospective, non-comparative case series included 397 patients (409 eyes) of the 746 consecutive patients that met the eligibility criteria. Standardized visual acuity testing, fluorescein angiography, and optical coherence tomography were performed. Data collected included status of the fellow eye, previous treatment, subtypes of choroidal neovascularization (CNV), size ...

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    20. Association Between Abnormal Autofluorescence and Photoreceptor Disorganization in Retinitis Pigmentosa

      Purpose To evaluate the association between the third high-reflectance band on high-resolution optical coherence tomography (OCT), fundus autofluorescence (AF), and kinetic perimetry results in patients with typical retinitis pigmentosa (RP). Design Retrospective, observational case series. Methods Thirty-four patients with typical RP who were referred to our institute were examined, with a diagnosis made by full-field electroretinography. We evaluated the fundus AF and the third high-reflectance band by high-resolution OCT, both qualitatively and quantitatively. We investigated whether the vertical length of the AF diameter or the third high-reflectance band correlated with Goldmann kinetic perimetry results. Results We classified three types of ...
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    11713-11736 of 12085 « 1 2 ... 486 487 488 489 490 491 492 ... 502 503 504 »
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