1. Articles from Giacomo Savini

    1-24 of 39 1 2 »
    1. Repeatability of new optical biometer and agreement with two validated optical biometers, all based on swept-source optical coherence tomography

      Repeatability of new optical biometer and agreement with two validated optical biometers, all based on swept-source optical coherence tomography

      Purpose: to evaluate the repeatability of the measurements provided by a new optical biometer (EyeStar 900, Haag-Streit) based on swept-source optical coherence tomography (SS- OCT) and their agreement with the measurements given by two validated biometers based on the same technology, the IOLMaster 700 (Carl Zeiss Meditec) and Argos (Movu). Setting: IRCCS G.B. Bietti Foundation, Rome, Italy. Design: Prospective evaluation of diagnostic test. Methods: In a series of unoperated eyes, three consecutive scans were acquired with the EyeStar 900, and one with the IOLMaster 700 and the Argos. The following biometry parameters were analyzed: axial length (AL), keratometry (K ...

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    2. Agreement of intraocular lens power calculation between 2 SS-OCT–based biometers

      Agreement of intraocular lens power calculation between 2 SS-OCT–based biometers

      Purpose: To assess agreement of measurements by 2 swept-source optical coherence tomography biometers and to evaluate the prediction error (PE) in intraocular lens power calculation with 7 formulas. Setting: Tertiary public eye hospital. Design: Consecutive observational. Methods: Axial length (AL), keratometry (K), anterior chamber depth (ACD), lens thickness (LT), and corneal diameter (CD) were measured with the IOLMaster 700 (Biometer A) and Anterion (Biometer B). Agreement was quantified by the limits of agreement and concordance correlation coefficient (CCC). The PE, the median absolute error, and the mean absolute error of the Barrett Universal II, EVO 2.0, Haigis, Hoffer Q ...

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    3. Comparison of a New Optical Biometer That Combines Scheimpflug Imaging With Partial Coherence Interferometry With That of an Optical Biometer Based on Swept-Source Optical Coherence Tomography and Placido-Disk Topography

      Comparison of a New Optical Biometer That Combines Scheimpflug Imaging With Partial Coherence Interferometry With That of an Optical Biometer Based on Swept-Source Optical Coherence Tomography and Placido-Disk Topography

      Purpose: To evaluate measurement precision and to compare the Pentacam AXL (Oculus Optikgeräte, Wetzlar, German), a new optical biometer based on Scheimpflug imaging and partial coherence interferometry (PCI) with that of the OA-2000 biometer (Tomey, Nagoya, Japan), which combines swept-source optical coherence tomography (SS-OCT) and Placido-disk topography. Methods: Axial length (AL), central corneal thickness (CCT), anterior chamber depth (ACD), aqueous depth (AQD), mean keratometry (Km), astigmatism vectors J0, J45, and corneal diameter (CD) were measured in triplicate by two technical operators. Within-subject standard deviation (Sw), repeatability and reproducibility (2.77 Sw), coefficient of variation (CoV), and intraclass correlation coefficient ...

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    4. A comparison of different methods to calculate the axial length measured by optical biometry

      A comparison of different methods to calculate the axial length measured by optical biometry

      Purpose To compare axial length (AL) measurements in long eyes by two swept-source optical coherence tomography (SS-OCT) biometers, one based on the group refractive index (IOLMaster 700, Zeiss) and the other based on sum of segments (Argos, Movu), and compare these measurements to previously published methods to optimize AL. Setting I.R.C.C.S. - G.B. Bietti Foundation, Rome, Italy Design Prospective case series Methods AL was measured with both optical biometers in myopic patients (AL > 24.00 mm) and compared to the values obtained with Wang-Koch adjustment, polynomial equations for the Holladay 1 and 2 formulas and Cooke ...

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      Mentions: Movu
    5. The Precision of a New Anterior Segment Optical Coherence Tomographer and Its Comparison With a Swept-Source OCT-Based Optical Biometer in Patients With Cataract

      The Precision of a New Anterior Segment Optical Coherence Tomographer and Its Comparison With a Swept-Source OCT-Based Optical Biometer in Patients With Cataract

      PURPOSE: To assess the precision of a new spectral-domain optical coherence tomographer (SD-OCT)/Placido topographer (MS-39; CSO) and its comparison with a swept-source OCT (SS-OCT) biometer (Argos; Movu, Inc) in patients with cataract. METHODS: Fifty-three right eyes from 53 patients were examined by two experienced operators three times using both devices randomly. Employing the within-subject standard deviation (S w ), test–retest variability, coefficient of variation, and intraclass correlation coefficient to evaluate intraoperator repeatability and interoperator reproducibility; the double-angle plots to analyze astigmatism; and Bland-Altman plots and 95% limits of agreement to verify the agreement between devices. RESULTS: The SD-OCT/Placido ...

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      Mentions: Movu CSO
    6. Agreement of IOL power calculation between IOLMaster 700 and Anterion swept source optical coherence tomography-based biometers

      Agreement of IOL power calculation between IOLMaster 700 and Anterion swept source optical coherence tomography-based biometers

      Purpose: To assess agreement of measurements by two swept source optical coherence tomography (SS-OCT) biometers and to evaluate the prediction error (PE) in intraocular lens (IOL) power calculation with seven formulas. Setting: Tertiary public eye hospital. Design: Consecutive observational. Methods: Axial length (AL), keratometry (K), anterior chamber depth (ACD), lens thickness (LT), and corneal diameter (CD) were measured with IOL Master 700 (Biometer A) and Anterion (Biometer B). Agreement was quantified by the limits of agreement (LoAs) and concordance correlation coefficient (CCC). The PE, the median absolute error (MedAE), and the mean absolute error (MAE) of the Barrett Universal II ...

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    7. The Use of Anterior-Segment Optical-Coherence Tomography for the Assessment of the Iridocorneal Angle and Its Alterations: Update and Current Evidence

      The Use of Anterior-Segment Optical-Coherence Tomography for the Assessment of the Iridocorneal Angle and Its Alterations: Update and Current Evidence

      The introduction of anterior-segment optical-coherence tomography (AS-OCT) has led to improved assessments of the anatomy of the iridocorneal-angle and diagnoses of several mechanisms of angle closure which often result in raised intraocular pressure (IOP). Continuous advancements in AS-OCT technology and software, along with an extensive research in the field, have resulted in a wide range of possible parameters that may be used to diagnose and follow up on patients with this spectrum of diseases. However, the clinical relevance of such variables needs to be explored thoroughly. The aim of the present review is to summarize the current evidence supporting the ...

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    8. Repeatability of automated measurements by a new anterior segment optical coherence tomographer and biometer and agreement with standard devices

      Repeatability of automated measurements by a new anterior segment optical coherence tomographer and biometer and agreement with standard devices

      We assess repeatability of automatic measurements of a new anterior segment optical coherence tomographer and biometer (ANTERION) and their agreement with those provided by an anterior segment-optical coherence tomography device combined with Placido-disk corneal topography (MS-39) and a validated optical biometer (IOLMaster 500). A consecutive series of patients underwent three measurements with ANTERION and one with MS-39. A subgroup of patients underwent biometry also with IOLMaster 500. Repeatability was assessed by means of within-subject standard deviation, coefficient of variation (COV), and intraclass correlation coefficient (ICC). Agreement was investigated with the 95% limits of agreement. Paired t-test and Wilcoxon matched-pairs test ...

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    9. Agreement Between Two Optical Biometers Based on Large Coherence Length SS-OCT and Scheimpflug Imaging/Partial Coherence Interferometry

      Agreement Between Two Optical Biometers Based on Large Coherence Length SS-OCT and Scheimpflug Imaging/Partial Coherence Interferometry

      PURPOSE: To evaluate the agreement between measurements obtained with a new optical biometer (Argos; Movu Inc) using large coherence length swept-source optical coherence tomography (SS-OCT) and those obtained with an optical biometer with a rotating Scheimpflug camera, combined with partial coherence interferometry (PCI) (Pentacam AXL; Oculus Optikgeräte GmbH) in adults. METHODS: The following measurements were examined and evaluated: axial length, central corneal thickness (CCT), anterior chamber depth (ACD), mean keratometry, J 0 and J 45 vectors, and corneal diameter. Measurements with the two biometers were conducted in triplicate per instrument in a random order by the same examiner. Paired ...

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      Mentions: Movu
    10. The precision and agreement of corneal thickness and keratometry measurements with SS-OCT versus Scheimpflug imaging

      The precision and agreement of corneal thickness and keratometry measurements with SS-OCT versus Scheimpflug imaging

      Purpose To assess the repeatability and reproducibility of swept-source optical coherence tomography (SS-OCT) and Scheimpflug system and evaluate the agreement between the two systems in measuring multiple corneal regions in children. Methods Pachymetric and keratometric maps for both systems were evaluated. Central, midperipheral and peripheral corneal thickness (CT), keratometry and astigmatism power vectors were recorded. The three outcomes yielded by the same observer were used to assess intraobserver repeatability. The differences in the mean values provided by each observer were used to evaluate interobserver reproducibility. Within-subject standard deviation, test-retest repeatability (TRT) and coefficient of variation (CoV) were used to analyze ...

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    11. Reliability of a New Swept-Source Optical Coherence Tomography Biometer in Healthy Children, Adults, and Cataract Patients

      Reliability of a New Swept-Source Optical Coherence Tomography Biometer in Healthy Children, Adults, and Cataract Patients

      Purpose . To comprehensively assess the reliability of a new optical biometer (IOLMaster 700), based on swept-source optical coherence tomography (SS-OCT) and comparison with a standard biometer (IOLMaster 500), in healthy children, adults, and cataract patients. Methods . A total of 301 eyes from 301 consecutive subjects were enrolled prospectively. Two experienced operators measured each eye three times consecutively with the IOLMaster 700. The axial length (AL), keratometry (K), anterior chamber depth (ACD), lens thickness (LT), central corneal thickness (CCT), and white-to-white (WTW) distance were recorded. Intraoperator repeatability and interoperator reproducibility of the IOLMaster 700 were analyzed using the test-retest (TRT), coefficients ...

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    12. Effect of orthokeratology on precision and agreement assessment of a new swept-source optical coherence tomography biometer

      Effect of orthokeratology on precision and agreement assessment of a new swept-source optical coherence tomography biometer

      Background To evaluate the effect of orthokeratology on precision of measurements in children using a new swept-source optical coherence tomography (SS-OCT) optical biometer (OA-2000), and agreement between its measurements and those provided by the commonly used IOLMaster based on partial coherence interferometry (PCI). Methods This study recruited fifty-one eyes of 51 normal children (8–16 years). An operator took measurements with the two biometers. Then, a second operator took measurements with the SS-OCT biometer. After orthokeratology was performed for one month, the same operators repeated the same procedures. Axial length (AL), mean keratometry (Km) at 2.5 mm and 3 ...

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    13. Repeatability of anterior segment measurements by optical coherence tomography combined with Placido disk corneal topography in eyes with keratoconus

      Repeatability of anterior segment measurements by optical coherence tomography combined with Placido disk corneal topography in eyes with keratoconus

      Corneal tomography is an important tool to identify and follow up eyes with keratoconus. Our study evaluate the repeatability of the automatic measurements provided in keratoconic eyes by a new anterior-segment optical coherence tomographer (AS-OCT) combined with Placido-disk topography (MS-39, CSO) and assess their agreement with the corresponding measurements taken with a rotating Scheimpflug camera combined with Placido-disk topography (Sirius, CSO). Mean simulated keratometry, posterior and total corneal power, total corneal astigmatism, corneal asphericity, thinnest corneal thickness, epithelial thickness, corneal diameter, and aqueous depth were evaluated. Repeatability was assessed using test–retest variability, the coefficient of variation, and the intraclass ...

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      Mentions: CSO
    14. Comparison Of Formulas Accuracy For IOL Power Calculation Based On Measurements By A SWEPT-SOURCE Optical Coherence Tomography Optical Biometer

      Comparison Of Formulas Accuracy For IOL Power Calculation Based On Measurements By A SWEPT-SOURCE Optical Coherence Tomography Optical Biometer

      Purpose To analyze the results of intraocular lens (IOL) power calculation using measurements by a swept-source optical coherence tomography (SS-OCT) optical biometer. Setting IRCCS G.B. Bietti Foundation, Rome, Italy. Design Evaluation of a diagnostic test instrument. Methods Preoperative measurements by the OA-2000 (Tomey Inc.) were taken in a consecutive series of patients undergoing cataract surgery with one IOL model (AcrySof SN60WF, Alcon Laboratories, Inc.). Measurements were entered into the following formulas: Barrett Universal II, EVO, Haigis, Hoffer Q, Holladay 1, Holladay 2, Holladay 2 with axial length adjustment, Kane, Olsen, Panacea, SRK/T, T2 and VRF. When refraction was ...

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    15. Repeatability and reproducibility of optical biometry implemented in a commercially-available optical coherence tomography device and comparison with Lenstar

      Repeatability and reproducibility of optical biometry implemented in a commercially-available optical coherence tomography device and comparison with Lenstar

      P urpose To examine the repeatability and reproducibility of biometry provided by a new anterior-posterior segment spectral-domain optical coherence tomography (SD-OCT) device (Revo NX, Optopol Technology Sp. z o.o., Zawiercie, Poland), and to compare them to those provided by a validated low-coherence optical reflectometry (LCOR) biometer, the Lenstar LS 900. Setting Hygeia Clinic, Gdańsk, Poland Design Prospective evaluation of diagnostic test. Methods Axial length (AL), lens thickness (LT), central corneal thickness (CCT) and anterior chamber depth (ACD, corneal epithelium to lens) were measured in 63 eyes of 63 patients. Two skilled operators, in random order, obtained three measurements with ...

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    16. Comparison of anterior segment measurements obtained using a swept-source optical coherence tomography biometer and a Scheimpflug–Placido tomographer

      Comparison of anterior segment measurements obtained using a swept-source optical coherence tomography biometer and a Scheimpflug–Placido tomographer

      Purpose To assess the repeatability and agreement of anterior segment measurements between an optical biometer (IOLMaster 700) using swept-source optical coherence tomography and a Scheimpflug–Placido tomographer (Sirius) in patients scheduled for corneal refractive surgery. Setting Eye Hospital of Wenzhou Medical University, Zhejiang, China. Design Prospective case series. Methods The parameters, including the central corneal thickness (CCT), anterior chamber depth (ACD), aqueous depth, keratometry (K) values, astigmatism, J0 (Jackson cross-cylinder with axes at 180 degree and 90 degrees) and J45 vectors (Jackson cross-cylinder with axes at 45 degrees and 135 degrees), and horizontal corneal diameter, were measured 3 times per ...

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    17. Precision of a new ocular biometer in eyes with cataract using swept source optical coherence tomography combined with Placido-disk corneal topography

      Precision of a new ocular biometer in eyes with cataract using swept source optical coherence tomography combined with Placido-disk corneal topography

      The present study was to assess the precision (repeatability and reproducibility) of a new optical biometer (OA-2000, Tomey, Japan) based on swept-source optical coherence tomography (SS-OCT) and Placido disk topography in eyes with cataracts. Seventy-eight eyes from seventy-eight patients with cataracts were evaluated. Axial length (AL), anterior chamber depth (ACD), keratometry (K) over a 2.5 mm and 3.0 mm diameter, lens thickness (LT), central corneal thickness (CCT) and white-to-white (WTW) distance were measured by 2 skilled operators. OA-2000 measurements were highly repeatable and reproducible for all parameters (intraclass correlation, 0.925 to 1.000). OA-2000 derived K-values with ...

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    18. Accuracy of a New Swept-Source Optical Coherence Tomography Biometer for IOL Power Calculation and Comparison to IOLMaster

      Accuracy of a New Swept-Source Optical Coherence Tomography Biometer for IOL Power Calculation and Comparison to IOLMaster

      PURPOSE: To investigate the accuracy of the measurements provided by a new optical biometer (OA-2000, Tomey Corporation, Nagoya, Japan) for calculating the intraocular lens (IOL) power and to compare the refractive outcomes to those obtained with the IOLMaster 500 (Carl Zeiss Meditec, Jena, Germany). METHODS: In this interventional multicenter study, consecutive patients having cataract surgery were enrolled. Only the IOL model used in the largest sample of patients was selected and the eyes implanted with that IOL were subsequently analyzed. The OA-2000, an optical biometer based on swept-source optical coherence tomography (SS-OCT), was used to measure axial length and corneal ...

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    19. Re: Goto et al.: Prediction of postoperative intraocular lens position with angle-to-angle depth using anterior segment optical coherence tomography (Ophthalmology. 2016;123:2474-2480)

      Re: Goto et al.: Prediction of postoperative intraocular lens position with angle-to-angle depth using anterior segment optical coherence tomography (Ophthalmology. 2016;123:2474-2480)

      To the Editor: We read with interest the study by Goto et al, 1 who described a new formula to predict the postoperative position of the intraocular lens (IOL). Although their results are interesting and might be useful for IOL power calculation, we feel that some comments are necessary. First, comparing what they define as the “postoperative external anterior chamber depth,” either measured or predicted by anterior segment optical coherence tomography, to the IOL position, as predicted by thin lens formulas, is not the proper method. The measurements performed by the authors, in fact, refer to a thick lens system ...

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    20. Optical coherence tomography angiography of the peripapillary retina and optic nerve head in dominant optic atrophy

      Optical coherence tomography angiography of the peripapillary retina and optic nerve head in dominant optic atrophy

      Peripapillar and nerve head vessel density (VD) was measured in 10 patients affected by Dominant optic atrophy (DOA) using optical coherence tomography angiography (OCT-A) and compared to the measurements of 15 age- and gender-matched controls. DOA patients showed VD reduction, mostly in the temporal and inferotemporal peripapillary sectors, according to the preferential involvement of the papillomacular bundle. Despite poor best-corrected visual acuity (BCVA), OCT-A revealed good repeatability. VD correlated with functional (mean deviation of visual field and BCVA) and structural (retinal nerve fiber layer thickness) parameters and could be a non-invasive, quantitative tool for the monitoring of the disease and ...

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    21. Repeatability and interobserver reproducibility of a new optical biometer based on swept-source optical coherence tomography and comparison with IOLMaster

      Repeatability and interobserver reproducibility of a new optical biometer based on swept-source optical coherence tomography and comparison with IOLMaster

      Objective To evaluate the precision of the measurements in healthy subjects obtained with a new optical biometer (OA-2000, Tomey, Nagoya, Japan) using swept-source optical coherence tomography (SS-OCT) and compare these measurements with those provided by the IOLMaster v5.4 (Carl Zeiss Meditec AG, Jena, Germany) using partial coherence interferometry (PCI). Methods Axial length (AL), keratometry (K) over 2.5 mm and 3.0 mm diameters, anterior chamber depth (ACD) (corneal epithelium to lens), lens thickness (LT), central corneal thickness and corneal diameter (CD) were measured with SS-OCT by two experienced operators. Intraobserver repeatability and interobserver reproducibility were assessed. AL, ACD ...

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    22. Comparison of a new optical biometer using swept-source optical coherence tomography and a biometer using optical low-coherence reflectometry

      Comparison of a new optical biometer using swept-source optical coherence tomography and a biometer using optical low-coherence reflectometry

      Purpose To investigate agreement between the IOLMaster 700 based on swept-source optical coherence tomography (SS-OCT) and the Lenstar LS 900 based on optical low-coherence reflectometry (OLCR). Setting Private practice, Castrop-Rouxelle, Germany. Design Prospective evaluation of diagnostic test. Methods Axial length (AL), keratometry (K), anterior chamber depth (corneal epithelium to lens) (ACD), lens thickness, and central corneal thickness (CCT) were measured in 183 eyes of 183 patients. Analyses used a paired t test, Pearson correlation coefficient ( r ), and Bland-Altman plots. Intraocular lens (IOL) power calculations were compared using the Hoffer Q, Holladay 1, and SRK/T formulas. Results The difference in ...

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      Mentions: UCLA
    23. The Repeatability Assessment of Three-Dimensional Capsule-Intraocular Lens Complex Measurements by Means of High-Speed Swept-Source Optical Coherence Tomography

      The Repeatability Assessment of Three-Dimensional Capsule-Intraocular Lens Complex Measurements by Means of High-Speed Swept-Source Optical Coherence Tomography

      Purpose To rebuild the three-dimensional (3-D) model of the anterior segment by high-speed swept-source optical coherence tomography (SSOCT) and evaluate the repeatability of measurement for the parameters of capsule-intraocular lens (C-IOL) complex. Methods Twenty-two pseudophakic eyes from 22 patients were enrolled. Three continuous SSOCT measurements were performed in all eyes and the tomograms obtained were used for 3-D reconstruction. The output data were used to evaluate the measurement repeatability. The parameters included postoperative aqueous depth (PAD), the area and diameter of the anterior capsule opening (Area and D), IOL tilt (IOL-T), horizontal, vertical, and space decentration of the IOL, anterior ...

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    24. Corneal Power Measurement Obtained by Fourier-Domain Optical Coherence Tomography: Repeatability, Reproducibility, and Comparison With Scheimpflug and Automated Keratometry Measurements

      Corneal Power Measurement Obtained by Fourier-Domain Optical Coherence Tomography: Repeatability, Reproducibility, and Comparison With Scheimpflug and Automated Keratometry Measurements

      Purpose: To assess the repeatability and reproducibility of corneal power values obtained by a Fourier-domain optical coherence tomography (FD-OCT) system (RTVue) and to compare them with the values obtained by a Scheimpflug camera system (Pentacam HR) and by automated keratometry (IOL Master). Methods: Thirty-two eyes from 32 healthy subjects were included in this prospective study. Two experienced observers measured each eye 3 consecutive times with the Pentacam, IOLMaster, and RTVue centered on either the pupil or corneal vertex. The conventional keratometry equivalent (CKE) and anterior (Ka), posterior (Kp), and net (Kn) corneal power values were determined. Results: The corneal power ...

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    1-24 of 39 1 2 »
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