1. Articles in category: Ophthalmology

    11545-11568 of 11968 « 1 2 ... 479 480 481 482 483 484 485 ... 497 498 499 »
    1. Combined hamartoma of the retina and retinal pigment epithelium diagnosed by retinal angiography and optical coherence tomography.

      Related Articles [Combined hamartoma of the retina and retinal pigment epithelium diagnosed by retinal angiography and optical coherence tomography.] Arch Soc Esp Oftalmol. 2008 Mar;83(3):193-6 Authors: Pérez-Alvarez MJ, Alejandre-Alba N, García-Sánchez J CLINICAL CASE: This report is based on the case of a 35-year-old woman who developed a combined hamartoma of the retina and retinal pigment epithelium in her right eye. The diagnosis was determined based on the fundus examination: hyperplasia of the retinal pigment epithelium cells, tortuosity of the vessels and epiretinal membrane. DISCUSSION: Optical coherence tomography and retinal angiography are important to ...
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    2. Retinal nerve fiber layer thickness in nonarteritic anterior ischemic optic neuropathy: OCT characterization of the acute and resolving phases

      Abstract Background  To evaluate longitudinal changes in retinal nerve fiber layer (RNFL) thickness in patients with nonarteritic anterior ischemic optic neuropathy (NAION) using optical coherence tomography (OCT). Methods  Prospective, observational case series study. Sixteen eyes from 15 consecutive patients affected with NAION were analyzed. The fellow unaffected eyes served as controls. Patients were divided into three different study groups: (1) patients with visual field (VF) defect confined to the inferior hemifield (five eyes), (2) patients with diffuse VF loss (seven eyes), and (3) patients with central or centrocecal scotoma (four eyes). The main outcome was peripapillary RNFL thickness measurement by ...
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    3. Anterior segment imaging: ultrasound biomicroscopy and anterior segment optical coherence tomography.

      Related Articles Anterior segment imaging: ultrasound biomicroscopy and anterior segment optical coherence tomography. Curr Opin Ophthalmol. 2008 Mar;19(2):115-21 Authors: Nolan W PURPOSE OF REVIEW: Recent advances in ocular imaging have included high-resolution techniques for visualizing the anterior segment and angle structures. This review will describe the two main anterior segment imaging modalities and summarize their applications, strengths and weaknesses. RECENT FINDINGS: Ultrasound biomicroscopy and more recently anterior segment optical coherence tomography are imaging modalities that can be used to obtain two-dimensional images of the angle and surrounding structures. Ultrasound biomicroscopy has the advantage of being able to ...
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    4. New developments in optical coherence tomography for glaucoma.

      Related Articles New developments in optical coherence tomography for glaucoma. Curr Opin Ophthalmol. 2008 Mar;19(2):127-35 Authors: Chang R, Budenz DL PURPOSE OF REVIEW: Structural imaging is becoming a powerful adjunct for the diagnosis and progression of glaucoma. There are several competing technologies in this arena. Optical coherence tomography continues to evolve at a fast pace, so it can be challenging to keep up with the latest information. This review covers the recent papers relevant to optical coherence tomography for glaucoma. RECENT FINDINGS: Retinal nerve fiber layer imaging by optical coherence tomography is reliable. Age, ethnicity, axial length ...
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    5. Analysis of Retinal Nerve Fiber Layer and Macular Thickness Measurements in Healthy Taiwanese Individuals Using Optical Coherence Tomography (Stratus OCT).

      Related Articles Analysis of Retinal Nerve Fiber Layer and Macular Thickness Measurements in Healthy Taiwanese Individuals Using Optical Coherence Tomography (Stratus OCT). J Glaucoma. 2008 January/February;17(1):30-35 Authors: Hsu SY, Tsai RK PURPOSE: To investigate the reproducibility of peripapillary retinal nerve fiber layer (RNFL) and macular thickness measurements in healthy Taiwanese subjects using optical coherence tomography (Stratus OCT). METHODS: Fifty-two eyes of 52 healthy Taiwanese subjects (32 females and 20 males) were enrolled in the cross-sectional study. A randomly chosen single eye from each healthy subject underwent thickness measurements using OCT, before and after pupillary dilation, by ...
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    6. Detection of an abnormally thick Lasik flap with anterior segment OCT imaging prior to planned Lasik retreatment surgery.

      Detection of an abnormally thick LASIK flap with anterior segment OCT imaging prior to planned LASIK retreatment surgery. J Refract Surg. 2008 Feb;24(2):197-9 Authors: Izquierdo L, Henriquez MA, Zakrzewski PA PURPOSE: To report a case of an abnormally thick flap that was detected with the use of anterior segment optical coherence tomography (OCT) prior to planned LASIK retreatment surgery. METHODS: A 43-year-old man presented 6 years after bilateral LASIK surgery with uncorrected visual acuity (UCVA) of 20/20 in the right eye and 20/100 in the left eye, and best spectacle-corrected visual acuity (BSCVA) of 20 ...
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    7. Optovue Fastest Growing Ophthalmic Device Company in Eye Care

      Fremont, CA - January 19, 2008 - Optovue, Inc., the first company to introduce a Fourier-domain optical coherence tomography (FD-OCT) system to the US market, today announced it achieved its 2007 unit sales, revenue and profitability goals, making it one of the fastest growing companies in eye care history. In their first full year of sales to the eye care market, Optovue announced that it installed 425 of the RTVue FD-OCT systems. Twenty five of the units were placed in clinical sites for data
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    8. Relationship between Retinal Nerve Fiber Layer Measurement and Signal Strength in Optical Coherence Tomography.

      Relationship between Retinal Nerve Fiber Layer Measurement and Signal Strength in Optical Coherence Tomography. Ophthalmology. 2008 Feb 20; Authors: Cheung CY, Leung CK, Lin D, Pang CP, Lam DS PURPOSE: To examine the relationship between signal strength and retinal nerve fiber layer (RNFL) thickness measured by optical coherence tomography (OCT). DESIGN: Observational cross-sectional study. PARTICIPANTS: Forty normal subjects were recruited. METHODS: Retinal nerve fiber layer (RNFL) thickness was measured by Stratus OCT (Carl Zeiss Meditec, Dublin, CA). In each eye, the focusing knob was adjusted to obtain 6 images with different signal strengths ranging from 5 to 10. The relationships ...
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    9. Role of Optic Nerve Imaging in Glaucoma Clinical Practice and Clinical Trials.

      Role of Optic Nerve Imaging in Glaucoma Clinical Practice and Clinical Trials. Am J Ophthalmol. 2008 Feb 22; Authors: Greenfield DS, Weinreb RN PURPOSE: To provide an update on the role of optic nerve and peripapillary retinal nerve fiber layer imaging in glaucoma clinical practice and clinical trials. DESIGN: Perspective. METHODS: Review of recent literature and authors' clinical and laboratory studies. RESULTS: Imaging technologies such as confocal scanning laser ophthalmoscopy, scanning laser polarimetry, and optical coherence tomography provide objective and quantitative measurements that are highly reproducible and show very good agreement with clinical estimates of optic nerve head structure and ...
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    10. The stress on the anterior lens surface during human in vivo accommodation

      Purpose: To determine the qualitative change in stress on the lens capsule during in vivo human accommodation. Methods: Nine subjects (mean age: 30 years; range: 25–38 years) were studied, each of whom had undergone a phakic refractive intraocular lens (PRL) surgical procedure. The change, during accommodation, of stress on the surface of the anterior lens capsule (ALS) was determined by employing high-resolution anterior segment optical coherence tomography (OCT). This was done by comparing the ratio of the intensity of the image from the anterior surface of the natural lens (ALS) to the images of the anterior corneal surface (ACS ...
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    11. Relationships between clinical measures of visual function, fluorescein angiographic and optical coherence tomography features in patients with subfoveal choroidal neovascularisation

      Aims: To examine the relationships between measures of vision, optical coherence tomography (OCT) and fundus fluorescein angiography (FFA) characteristics in patients with exudative age-related macular degeneration (AMD). Study design: Retrospective case note review. Inclusion criteria were: confirmed diagnosis of new exudative AMD; recorded visual function using best corrected distance visual acuity (DVA), near visual acuity (NVA) and contrast sensitivity; corresponding FFA and OCT. FFA parameters included greatest linear diameter of lesion (GLD), area of choroidal neovascularisation (CNV) and area of leakage. OCT parameters included maximum retinal thickness (Retmax), central foveal thickness, maximum thickness of the CNV (CNVmax), and the distances ...
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    12. Magnification characteristics of the Optical Coherence Tomograph STRATUS OCT 3000

      Purpose: To evaluate the magnification characteristics of an Optical Coherence Tomograph (STRATUS OCT 3000) used to measure optic disc size.Methods: An eye model was designed, built and used to measure changes in the magnification of the Optical Coherence Tomograph (OCT) with variation in the axial length of the eye and OCT correction lenses. Theoretical calculations using ray-tracing were used to compare the experimental and theoretical results.Results: OCT-performed fundus measurements have a magnification that depends on two factors: eye axial length and optical correction with the focusing dial of the OCT. Theoretical calculations showed that the size of the ...

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    13. Imaging Systems of Human Eye: A Review

      Abstract  The eyes are complex sensory organs and are designed to optimize vision under conditions of varying light. There are a number of eye disorders that can influence vision. Eye disorders among the elderly are a major health problem. With advancing age, the normal function of eye tissues decreases and there is an increased incidence of ocular pathology. The most common causes of age related eye disorder and visual impairment in the elderly are cataracts and primary open angle glaucoma. Different imaging systems are available to visualize the different parts of the eye non-invasively with higher accuracy. This paper discusses ...
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    14. Intracameral SF6 injection and anterior segment OCT-based documentation for acute hydrops management in pellucid marginal corneal degeneration.

      Related Articles Intracameral SF6 injection and anterior segment OCT-based documentation for acute hydrops management in pellucid marginal corneal degeneration. Cont Lens Anterior Eye. 2008 Feb 19; Authors: Vanathi M, Behera G, Vengayil S, Panda A, Khokhar S PURPOSE: To report a case of acute hydrops in pellucid marginal corneal degeneration (PMCD) documented with anterior segment optical segment tomography and successfully treated with sulphur hexafluoride (SF6) intracameral injection. METHODS: A 47-year-old female patient presented with spontaneous onset of pain, redness and decreased vision in her left eye. Clinical evaluation revealed bilateral PMCD with evidence of acute hydrops in the left eye ...
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    15. Imaging the vitreous: optical coherence tomography and ultrasound imaging.

      Related Articles Imaging the vitreous: optical coherence tomography and ultrasound imaging. Eye. 2008 Feb 22; Authors: Restori M Imaging the vitreous in optically transparent and translucent ocular media using OCT and in optically opaque ocular media using ultrasound is discussed.Optical coherence tomography and colour flow mapping are briefly described. Images of tomograms, B-mode sections, and colour flow maps illustrate the use of these techniques in imaging the vitreous.Eye advance online publication, 22 February 2008; doi:10.1038/eye.2008.30. PMID: 18292783 [PubMed - as supplied by publisher]
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    16. Optic disc topography of normal Indian eyes: An assessment using optical coherence tomography.

      Related Articles Optic disc topography of normal Indian eyes: An assessment using optical coherence tomography. Indian J Ophthalmol. 2008 Mar-Apr;56(2):99-102 Authors: Dacosta S, Bilal S, Rajendran B, Janakiraman P Purpose: To study the optic disc topographic measurements of normal Indian eyes using optical coherence tomography (OCT). Materials and Methods: One hundred and fifty eyes selected randomly from 150 normal Indian subjects of both sex and various age groups underwent optic disc imaging with the OCT using the fast optic disc protocol. Results: Mean +/- standard deviation of the optic disc topographic measurements were: disc area 2.63 +/- 0 ...
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    17. Imaging the vitreous: optical coherence tomography and ultrasound imaging

      Imaging the vitreous in optically transparent and translucent ocular media using OCT and in optically opaque ocular media using ultrasound is discussed. Optical coherence tomography and colour flow mapping are briefly described. Images of tomograms, B-mode sections, and colour flow maps illustrate the use of these techniques in imaging the vitreous
      Read Full Article
    18. Imaging the vitreous: optical coherence tomography and ultrasound imaging

      Imaging the vitreous in optically transparent and translucent ocular media using OCT and in optically opaque ocular media using ultrasound is discussed. Optical coherence tomography and colour flow mapping are briefly described. Images of tomograms, B-mode sections, and colour flow maps illustrate the use of these techniques in imaging the vitreous.
      Read Full Article
    19. Tutorial on Photoacoustic Microscopy and Computed Tomography

      The field of photoacoustic tomography has experienced considerable growth in the past few years. Although several commercially available pure optical imaging modalities, including confocal microscopy, two-photon microscopy, and optical coherence tomography, have been highly successful, none of these technologies can provide penetration beyond $sim$1 mm into scattering biological tissues, because they are based on ballistic and quasi-ballistic photons. Heretofore, there has been a void in high-resolution optical imaging beyond this penetration limit. Photoacoustic tomography, which combines high ultrasonic resolution and strong optical contrast in a single modality, has broken through this limitation and filled this void. In this paper ...
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    11545-11568 of 11968 « 1 2 ... 479 480 481 482 483 484 485 ... 497 498 499 »
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