1. Articles from Healio.com

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  2. 337-349 of 349 « 1 2 ... 12 13 14 15
    1. Architectural Analysis of Clear Corneal Incision Techniques in Cataract Surgery Using Fourier-Domain OCT

      Architectural Analysis of Clear Corneal Incision Techniques in Cataract Surgery Using Fourier-Domain OCT

      BACKGROUND AND OBJECTIVE: To compare the architecture of single plane self-sealing clear corneal incision (SP-CCI) and shallow grooved self-sealing clear corneal incision (SG-CCI) after cataract surgery using Fourier-domain optical coherence tomography (FD-OCT). PATIENTS AND METHODS: An FD-OCT system with a corneal adaptor module was used to image the corneal incisions in radial sections in 44 eyes. A line scan pattern was used to measure the corneal incision, positioning the caliper mark perpendicular to the limbus. Measurements were performed immediately after cataract surgery and at postoperative days 1, 7, and 30. Incisions were analyzed regarding length, location, angle, architecture, and anatomic ...

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    2. Intrasession Reproducibility of RNFL Thickness Measurements Using SD-OCT in Eyes With Keratoconus

      Intrasession Reproducibility of RNFL Thickness Measurements Using SD-OCT in Eyes With Keratoconus

      BACKGROUND AND OBJECTIVE: To evaluate the intrasession reproducibility of the peripapillary retinal nerve fiber layer (RNFL) thickness measurements obtained by spectral-domain optical coherence tomography (SD-OCT) in eyes with keratoconus and normal eyes. PATIENTS AND METHODS: Peripapillary RNFL thickness measurements with SD-OCT were repeated three times during the same visit using the eye tracker and retest function in one eye of each participant. Reproducibility was evaluated using within-subject standard deviation (Sw), coefficient of variation (CV), and intraclass correlation coefficient (ICC). RESULTS: For the overall global RNFL thickness, the values of the three parameters were Sw (± 1.96 standard error) 1.43 ...

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    3. Automated Detection of the Foveal Center Improves SD-OCT Measurements of Central Retinal Thickness

      Automated Detection of the Foveal Center Improves SD-OCT Measurements of Central Retinal Thickness

      BACKGROUND AND OBJECTIVE: To investigate the performance of an automated foveal center detection algorithm on spectral-domain optical coherence tomography (SD-OCT). PATIENTS AND METHODS: Fifty normal eyes and 50 eyes with early stage dry age-related macular degeneration (AMD) were analyzed. The actual scan center (SC), automatically detected foveal center (AF), and manually identified foveal center (MF) were compared. RESULTS: The mean of the radial distances was 89 ± 120 μm from MF to SC and 54 ± 41 μm from MF to AF for normal eyes and 179 ± 125 μm from SC to MF and 104 ± 62 μm from AF to MF for ...

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    4. Evaluation of Corneal Thickness, Anterior Chamber Depth, and Iridocorneal Angle Following Scleral Buckling Surgery With AS-OCT

      Evaluation of Corneal Thickness, Anterior Chamber Depth, and Iridocorneal Angle Following Scleral Buckling Surgery With AS-OCT

      BACKGROUND AND OBJECTIVE: To evaluate the changes in central corneal thickness (CCT), anterior chamber depth (ACD), and iridocorneal angle (ICA) with anterior segment optical coherence tomography (AS-OCT) following scleral buckling surgery. PATIENTS AND METHODS: Thirty-one eyes with rhegmatogenous retinal detachment that underwent scleral buckling were included in this prospective study. Changes in CCT, ACD, and ICA were measured with AS-OCT. RESULTS: There was a significant increase in the CCT at 1 day and 1 week postoperatively. CCT became slightly thinner than the preoperative values at 1 month postoperatively. The ACD was relatively shallow at all visits after the surgery. The ...

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    5. Tissue Layer Image of the Photoreceptor Layer in Central Serous Chorioretinopathy Using Spectral-Domain Optical Coherence Tomography

      Tissue Layer Image of the Photoreceptor Layer in Central Serous Chorioretinopathy Using Spectral-Domain Optical Coherence Tomography

      BACKGROUND AND OBJECTIVE: To investigate the findings of a tissue layer image of the photoreceptor layer, or photoreceptor layer map (PLM), using spectral-domain optical coherence tomography (SD-OCT) in central serous chorioretinopathy (CSC). PATIENTS AND METHODS: Data scanned using SD-OCT in CSC were processed to obtain PLMs, which were analyzed and compared with fluorescein angiography and OCT. RESULTS: Among 72 eyes of 69 patients, PLMs depicted subretinal fluid as distinct hyporeflective areas in 71 eyes (98.6% sensitivity). Attenuated signals at the junction of the inner and outer segments of the photo-receptors in OCT were depicted as relative hyporeflective areas corresponding ...

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    6. Assessment of Vitreous Incarceration in Sclerotomies With OCT, Ultrasound Biomicroscopy, and Direct Visualization

      Assessment of Vitreous Incarceration in Sclerotomies With OCT, Ultrasound Biomicroscopy, and Direct Visualization

      BACKGROUND AND OBJECTIVE: To compare anterior-segment optical coherence tomography (AS-OCT), ultrasound biomicroscopy (UBM), and direct visualization for detecting vitreous incarceration in sutureless sclerotomies. MATERIALS AND METHODS: Prospective, randomized, and observer-masked experimental study in which 23-gauge vitrectomy was performed in pig eyes. Postoperative incisional vitreous incarceration was evaluated by AS-OCT, UBM, and direct visualization. RESULTS: One hundred eighteen pig eyes were included. Vitreous entrapment was found in 7.9% (28 of 354), 59.6% (211 of 354), and 95.5% (338 of 354) of the sclerotomies analyzed by AS-OCT, UBM, and direct visualization, respectively. Direct visualization was the most sensible method ...

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    7. OCT Findings in Birdshot Chorioretinitis: A Glimpse Into Retinal Disease Evolution

      OCT Findings in Birdshot Chorioretinitis: A Glimpse Into Retinal Disease Evolution

      BACKGROUND AND OBJECTIVE: Birdshot chorioretinitis is a rare disease independently involving the retina and the choroid. Retinal involvement has deleterious functional consequences. This study aimed to follow retinal profiles in early (< 1 year, untreated), intermediate (1 to 6 years, receiving therapy), and late (> 6 years) birdshot chorioretinitis. PATIENTS AND METHODS: Optical coherence tomography images were retrospectively evaluated in 28 eyes and retinal thickness was calculated in the foveola, parafoveal nasal, and temporal area; nasal and temporal mid-peripheral macula; and nasal and temporal periphery of the macula. RESULTS: Retinal thickness was significantly elevated in early birdshot chorioretinitis because of diffuse exudative ...

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    8. Morphometric Analysis of Epiretinal Membranes Using Spectral-Domain Optical Coherence Tomography

      Morphometric Analysis of Epiretinal Membranes Using Spectral-Domain Optical Coherence Tomography

      BACKGROUND AND OBJECTIVE: To determine whether the volumes of macular layers before and after epiretinal membrane (ERM) peeling as measured by spectral-domain optical coherence tomography (SD-OCT) correlated with best-corrected visual acuity (BCVA) or ERM location. PATIENTS AND METHODS: Thirty-six eyes with idiopathic ERM and 12 control eyes were imaged pre-operatively and postoperatively using SD-OCT. The inner, middle, and outer retinal layers were measured in the temporal and nasal half of the central 1,500 μm of the macula for each of the SD-OCT five raster scans and used to estimate the volumes for each group. RESULTS: The inner layer volumes ...

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    9. Intraoperative spectral-domain optical coherence tomography in coats' disease

      Intraoperative spectral-domain optical coherence tomography in coats' disease

      The authors describe the spectral-domain optical coherence tomography findings in three patients undergoing examinations under anesthesia for treatment of Coats’ disease. Patients were treated using a multifaceted approach of intravitreal bevacizumab and indirect diode laser vascular ablation. A handheld, portable spectral-domain optical coherence tomography system was used as a novel and critical intraoperative tool in differentiating Coats’ disease from diffuse retinoblastoma and other simulating conditions and to monitor reductions in subretinal and intraretinal exudation during the course of treatment.

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    10. Errors in Thickness Comparison Maps From 3D Optical Coherence Tomography

      Errors in Thickness Comparison Maps From 3D Optical Coherence Tomography

      BACKGROUND AND OBJECTIVE: To study characteristics of errors in thickness comparison maps (TCMs) from three-dimensional optical coherence tomography. PATIENTS AND METHODS: Patients who underwent three-dimensional optical coherence tomography examinations were included. Errors in TCM were categorized into several types according to common features, and the origins and distributions of errors were investigated. RESULTS: Errors were observed in 25 (22.9%) of 109 TCMs with a normal macula and in 88 (63.3%) of 139 TCMs with an abnormal macula (P < .001). The errors were categorized into three types: horizontal line-shaped errors that originated from fixation loss by the examinee, jumping ...

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      Mentions: Korea University
    11. SD-OCT in Pigmented Paravenous Retinochoroidal Atrophy

      SD-OCT in Pigmented Paravenous Retinochoroidal Atrophy

      Pigmented paravenous retinochoroidal atrophy (PPRCA) is a rare disease characterized by bilateral retinochoroidal atrophy and pigmentation along the retinal veins. The authors describe spectral-domain optical coherence tomography (SD-OCT) in a case of PPRCA. The right macula showed a lamellar macular hole. In addition, scans were taken through the affected areas along the retinal veins that revealed the location of the pigment and other features. These findings have not been reported previously.

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    12. Enhanced Depth Imaging Optical Coherence Tomography: Choroidal Thickness and Correlations With Age, Refractive Error, and Axial Length

      Enhanced Depth Imaging Optical Coherence Tomography: Choroidal Thickness and Correlations With Age, Refractive Error, and Axial Length

      BACKGROUND AND OBJECTIVE: To evaluate choroidal thickness at five macular locations and assess the correlations between choroidal thickness at these locations with age, refractive error, and axial length. PATIENTS AND METHODS: Eighty-four eyes from 42 healthy adult volunteers were included. Enhanced depth imaging by spectral-domain optical coherence tomography was performed, and choroidal thickness was measured at five macular locations: subfoveal and 3 mm nasal, temporal, superior, and inferior. Correlations of choroidal thickness at each location with age, refractive error, and axial length were analyzed. RESULTS: Mean choroidal thicknesses at the subfoveal, superior, inferior, temporal, and nasal locations were 293, 308 ...

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    13. Assessment of Intrastromal Corneal Ring Segment Position With Anterior Segment Optical Coherence Tomography.

      Assessment of Intrastromal Corneal Ring Segment Position With Anterior Segment Optical Coherence Tomography.

      BACKGROUND AND OBJECTIVE:To examine the exact position of implanted Keraring (Mediphacos, Belo Horizonte, Brazil) segments by high-resolution anterior segment optical coherence tomography (AS-OCT). PATIENTS AND METHODS:This study included 17 eyes of 13 patients with keratoconus who underwent uneventful intracorneal ring segment implantation with the aid of femtosecond laser. Eyes were evaluated by AS-OCT at the third postoperative month. Distance from the apex of the triangular cross-section of the ring segment to the anterior corneal surface and distances from two basal corners to the posterior corneal surface were measured. RESULTS:Distance from apex to anterior corneal surface (263.1 ...

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    337-349 of 349 « 1 2 ... 12 13 14 15
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