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https://www.readbyqxmd.com/read/30197950/adjustment-formulae-to-improve-the-correlation-of-white-to-white-measurement-with-direct-measurement-of-the-ciliary-sulcus-diameter-by-ultrasound-biomicroscopy
#1
Seyed Javad Hashemian, Majid Mohebbi, Mehdi Yaseri, Mohammad Ebrahim Jafari, Shadrokh Nabili, Seyed Mahyar Hashemian, Mahsa Sadat Hashemian
Purpose: This study evaluates the correlation between horizontal white-to-white (WTW) distance using Caliper and Orbscan IIz with the ciliary sulcus diameter measured by high frequency ultrasound biomicroscopy (UBM) and presents an adjustment formula to improve the correlation. Methods: We measured horizontal sulcus-to-sulcus (STS) dimension of 273 right eyes of 273 high myopic patients with 35 MHz UBM and horizontal WTW using Orbscan IIz and Caliper. Mean WTW diameter, differences, and the correlation of measurement methods were evaluated...
September 2018: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/30120293/improving-precision-for-detecting-change-in-the-shape-of-the-cornea-in-patients-with-keratoconus
#2
Matthias Brunner, Gabriela Czanner, Riccardo Vinciguerra, Vito Romano, Sajjad Ahmad, Mark Batterbury, Claire Britten, Colin E Willoughby, Stephen B Kaye
To investigate a method for precision analysis to discriminate true corneal change from measurement imprecision in keratoconus (KC). Thirty patients with KC and 30 healthy controls were included. Coefficients of repeatability and limits of agreement (LOA) were compared using multiple measurements for inter-observer and inter-device agreement with the Pentacam HR, Orbscan IIz, and Tomey Casia SS-1000. Correlation of repeated measurements was evaluated using a linear mixed effect model (also called random effect model)...
August 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30115298/analysis-of-cases-and-accuracy-of-3-risk-scoring-systems-in-predicting-ectasia-after-laser-in-situ-keratomileusis
#3
Cordelia Chan, Alain Saad, J Bradley Randleman, Mona Harissi-Dagher, Daniel Chua, Mujtaba Qazi, Jean-Jacques Saragoussi, Rohit Shetty, Jean-Marc Ancel, Robert Ang, Dan Z Reinstein, Damien Gatinel
PURPOSE: To identify risk factors for ectasia after laser in situ keratomileusis (LASIK) by comparing the accuracy of the Ectasia Risk Score System (ERSS), Screening Corneal Objective Risk of Ectasia (SCORE) Analyzer, and percentage of tissue altered (PTA) in predicting the occurrence of ectasia. SETTING: Multiple centers in 8 countries. DESIGN: Retrospective case series. METHODS: Previously unpublished post-LASIK ectasia cases were analyzed...
August 2018: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29944509/intrasubject-repeatability-and-interdevice-agreement-of-anterior-chamber-depth-measurements-by-orbscan-and-pentacam-in-different-grades-of-keratoconus
#4
Hassan Hashemi, Amir Asharlous, Mohammad Aghazadeh Amiri, Abbasali Yekta, Shahroukh Ramin, Azadeh Taheri, Mohamadreza Aghamirsalim, Mehdi Khabazkhoob
OBJECTIVES: To evaluate the repeatability of anterior chamber depth (ACD) measurements by Orbscan and Pentacam imaging devices in different grades of keratoconus. METHODS: One examiner performed 3 consecutive ACD measurements with both devices on 74 eyes of 42 keratoconus patient. Repeatability was assessed using intrasession test-retest variability. Within-subject SD was determined for repeatability, and the coefficient of variation was calculated for each measurement...
June 25, 2018: Eye & Contact Lens
https://www.readbyqxmd.com/read/29850210/group-analysis-of-q-values-calculated-with-tangential-radius-of-curvature-from-human-anterior-corneal-surface
#5
Zheren Xia, Chengmin Lin, Xueping Huang, Jinglu Ying, Mingguang Shi, Suilian Zheng
Objective: To calculate the Q values from the human anterior corneal surface with the tangential radius of curvature and analyze its distribution characteristics in different age and refractive status groups. Methods: Tangential power maps of the anterior cornea from Orbscan II were acquired for 201 subjects' right eyes. They were divided into groups of adults and children and then divided further into subgroups according to the refraction status. The Q values of each semimeridian were calculated by the tangential radius with a linear regression equation...
2018: Journal of Ophthalmology
https://www.readbyqxmd.com/read/29808064/prevalence-of-stromal-corneal-dystrophies-in-lahore
#6
Shagufta Naz, Saima Sharif, Haiba Kaul, Afshan Kaleem, Amina Tehseen
To determine the prevalence of Stromal Corneal Dystrophies (SCDs) in patient from Lahore hospitals. The study was performed between November, 2014 to July 2015 at the Layton Rahmatullah Benevolent Trust Hospital, Mughal Hospital, Mayo Hospital and General Hospital, Lahore. For the clinical evaluation of SCD by ophthalmologists examination of cornea was done by biomicroscopy, specular microscopy, topography, keratometry, orbscan and far visual acuity. Fifty cases of SCDs were recognized from Lahore, matching to hospital prevalence of 0...
April 2018: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/29729256/comparing-change-in-anterior-curvature-after-corneal-cross-linking-using-scanning-slit-and-scheimpflug-technology
#7
Paul Z Lang, Praneetha Thulasi, Sumitra S Khandelwal, Farhad Hafezi, J Bradley Randleman
PURPOSE: To evaluate the correlation between anterior axial curvature difference maps following corneal cross-linking (CXL) for progressive keratoconus obtained from Scheimpflug-based tomography and Placido-based topography. DESIGN: Between-devices reliability analysis of randomized clinical trial data. METHODS: Corneal imaging was collected at a single-center institution preoperatively and at 3, 6, and 12 months postoperatively using Scheimpflug-based tomography (Pentacam; Oculus Inc, Lynnwood, Washington, USA) and scanning-slit, Placido-based topography (Orbscan II; Bausch & Lomb, Rochester, New York, USA) in patients with progressive keratoconus receiving standard protocol CXL (3 mW/cm2 for 30 minutes)...
July 2018: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/29489497/association-of-axial-length-growth-and-topographic-change-in-orthokeratology
#8
Eun Jung Lee, Dong Hui Lim, Tae-Young Chung, Joo Hyun, Jisang Han
OBJECTIVES: To investigate the topographic factors related to axial length (AL) growth rate in orthokeratology. METHODS: Clinical data of myopic children with orthokeratology lenses from 2010 to 2016 were investigated. Corneal topography (Orbscan II) and IOLMaster-measured AL at baseline and every posttreatment visit were analyzed. Optical map topographies from baseline- and posttreatment-stabilized corneas were analyzed to calculate the refractive power difference between the apex and the periphery (apex-periphery refractive power difference [ARPD]), which estimates the change of peripheral refraction...
September 2018: Eye & Contact Lens
https://www.readbyqxmd.com/read/29468555/a-model-for-predicting-sulcus-to-sulcus-diameter-in-posterior-chamber-phakic-intraocular-lens-candidates-correlation-between-ocular-biometric-parameters
#9
Mohammad Ghoreishi, Mehdi Abdi-Shahshahani, Alireza Peyman, Mohsen Pourazizi
PURPOSE: The aim of this study was to determine the correlation between ocular biometric parameters and sulcus-to-sulcus (STS) diameter. METHODS: This was a cross-sectional study of preoperative ocular biometry data of patients who were candidates for phakic intraocular lens (IOL) surgery. Subjects underwent ocular biometry analysis, including refraction error evaluation using an autorefractor and Orbscan topography for white-to-white (WTW) corneal diameter and measurement...
February 21, 2018: International Ophthalmology
https://www.readbyqxmd.com/read/29403183/periorbital-biometric-measurements-using-imagej-software-standardisation-of-technique-and-assessment-of-intra-and-interobserver-variability
#10
R Rajyalakshmi, Winston D Prakash, Mohammad Javed Ali, Milind N Naik
Purpose: To assess the reliability and repeatability of periorbital biometric measurements using ImageJ software and to assess if the horizontal visible iris diameter (HVID) serves as a reliable scale for facial measurements. Methods: This study was a prospective, single-blind, comparative study. Two clinicians performed 12 periorbital measurements on 100 standardised face photographs. Each individual's HVID was determined by Orbscan IIz and used as a scale for measurements using ImageJ software...
July 2017: Journal of Cutaneous and Aesthetic Surgery
https://www.readbyqxmd.com/read/29339918/comparability-and-repeatability-of-different-methods-of-corneal-astigmatism-assessment
#11
Tiago B Ferreira, Filomena J Ribeiro
Purpose: To assess the comparability and repeatability of keratometric and astigmatism values measured by four techniques: Orbscan IIz® (Bausch and Lomb), Lenstar LS 900® (Haag-Streit), Cassini® (i-Optics), and Total Cassini (anterior + posterior surface), in healthy volunteers. Patients and methods: Fifteen healthy volunteers (30 eyes) were assessed by the four techniques. In each eye, three consecutive measures were performed by the same operator. Keratometric and astigmatism values were recorded...
2018: Clinical Ophthalmology
https://www.readbyqxmd.com/read/29181311/scanning-slit-topography-in-patients-with-keratoconus
#12
László Módis, Gábor Németh, Eszter Szalai, Zsuzsa Flaskó, Berthold Seitz
AIM: To evaluate the anterior and posterior corneal surfaces using scanning-slit topography and to determine the diagnostic ability of the measured corneal parameters in keratoconus. METHODS: Orbscan II measurements were taken in 39 keratoconic corneas previously diagnosed by corneal topography and in 39 healthy eyes. The central minimum, maximum, and astigmatic simulated keratometry (K) and anterior axial power values were determined. Spherical and cylindrical mean power diopters were obtained at the central and at the steepest point of the cornea both on anterior and on posterior mean power maps...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/29090045/comparison-between-pentacam-hr-and-orbscan-ii-after-hyperopic-photorefractive-keratectomy
#13
Mahmoud Jabbarvand, Farshad Askarizadeh, Mohamad Reza Sedaghat, Hadi Ghadimi, Bahram Khosravi, Mohammad Aghazadeh Amiri, Foroozan Narooie-Noori
PURPOSE: The aim of this study was to determine the agreement between Pentacam HR (Scheimpflug imaging, Oculus) and Orbscan II (scanning slit topography, Bausch and Lomb) in measuring corneal parameters after photorefractive keratectomy (PRK) for hyperopia. METHODS: In this prospective cross-sectional study, 38 hyperopic eyes undergoing PRK were examined before refractive surgery and 8 to 10 months postoperatively using Pentacam HR and Orbscan II. Ultrasound (US) pachymetry was also used to measure central corneal thickness (CCT)...
October 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/29056302/single-pass-four-throw-pupilloplasty-postoperative-mydriasis-and-fundus-visibility-in-pseudophakic-eyes
#14
Dhivya Ashok Kumar, Amar Agarwal, Maheswari Srinivasan, Jyothi Narendrakumar, Akshaya Mohanavelu, Keerthana Krishnakumar
PURPOSE: To analyze the pharmacological mydriasis and the consequent fundus visibility after single-pass 4-throw pupilloplasty in pseudophakic eyes. SETTING: Dr. Agarwal's Eye Hospital, Chennai, India. DESIGN: Comparative case series. METHODS: Patients with bilateral pseudophakia with single-pass 4-throw pupilloplasty in 1 eye (study) and no single-pass 4-throw in the fellow eye (control) were included. The pupil measurements were analyzed before and after the instillation of mydriatics (tropicamide 0...
October 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28791056/accuracy-of-different-topographic-instruments-in-calculating-corneal-power-after-myopic-photorefractive-keratectomy
#15
Alireza Baradaran-Rafii, Sahba Fekri, Mohammad Rezaie, Shahram Salehi-Rad, Ali Moradi, Tahmineh Motevasseli, Masumeh Kalantarion
PURPOSE: To compare the corneal power measurements obtained using different topographic instruments after myopic photorefractive keratectomy (PRK). METHODS: Patients with myopia who were candidates for corneal refractive surgery were sequentially included. Pre-PRK and six months post-PRK corneal powers were measured using Javal manual keratometer, Orbscan II, Galilei, Tomey TMS4, and EyeSys 2000 topographers. Measured values were compared with those obtained using the clinical history method (CHM)...
July 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/28545078/the-analysis-of-corneal-asphericity-q-value-and-its-related-factors-of-1-683-chinese-eyes-older-than-30-years
#16
Ying Xiong, Jing Li, Ningli Wang, Xue Liu, Zhao Wang, Frank F Tsai, Xiuhua Wan
PURPOSE: To determine corneal Q value and its related factors in Chinese subjects older than 30 years. DESIGN: Cross sectional study. METHODS: 1,683 participants (1,683 eyes) from the Handan Eye Study were involved, including 955 female and 728 male with average age of 53.64 years old (range from 30 to 107 years). The corneal Q values of anterior and posterior surfaces were measured at 3.0, 5.0 and 7.0mm aperture diameters using Bausch & Lomb Orbscan IIz (software version 3...
2017: PloS One
https://www.readbyqxmd.com/read/28532938/posterior-corneal-shape-comparison-of-height-data-from-3-corneal-topographers
#17
Tim de Jong, Matthew T Sheehan, Steven A Koopmans, Nomdo M Jansonius
PURPOSE: To compare the ability of 3 clinical corneal topographers to describe the posterior corneal shape. SETTING: University Medical Center Groningen, the Netherlands. DESIGN: Prospective observational study. METHODS: Corneas of healthy participants were measured twice with a dual Scheimpflug instrument (Galilei G2), a scanning-slit system (Orbscan IIz), and a single Scheimpflug instrument (Pentacam HR). Height data describing the posterior corneal shape were fit with Zernike polynomials...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28513495/effect-of-post-crosslinking-haze-on-the-repeatability-of-scheimpflug-based-and-slit-scanning-imaging-devices
#18
Rohit Shetty, Aarti Agrawal, Rashmi Deshmukh, Luci Kaweri, Harsha L Rao, Harsha Nagaraja, Chaitra Jayadev
PURPOSE: The aim of this study was to analyze the effect of postcollagen crosslinking (CXL) haze on the measurement and repeatability of pachymetry and mean keratometry (Km) of four corneal topographers. MATERIALS AND METHODS: Sixty eyes of sixty patients with progressive keratoconus who had undergone accelerated CXL (ACXL) underwent imaging with a scanning slit imaging device (Orbscan II) and three Scheimpflug imaging devices (Pentacam HR, Sirius, and Galilei)...
April 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28513492/repeatability-and-agreement-of-five-imaging-systems-for-measuring-anterior-segment-parameters-in-healthy-eyes
#19
RANDOMIZED CONTROLLED TRIAL
Mukesh Kumar, Rohit Shetty, Chaitra Jayadev, Harsha L Rao, Debarun Dutta
PURPOSE: The purpose of this study is to assess the repeatability and agreement of five imaging devices, namely, the Pentacam (Oculus), Sirius (CSO), Orbscan IIz (Bausch and Lomb), Corvis (Oculus), and ultrasound pachymetry (UP, Tomey) in measuring steep keratometry (sKm), flat keratometry (fKm), central corneal thickness (CCT), thinnest corneal thickness (TCT), and anterior chamber depth (ACD) in healthy individuals. DESIGN: This was prospective, comparative study...
April 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28471103/measurement-of-angle-kappa-using-ultrasound-biomicroscopy-and-corneal-topography
#20
Joon Hyung Yeo, Nam Ju Moon, Jeong Kyu Lee
PURPOSE: To introduce a new convenient and accurate method to measure the angle kappa using ultrasound biomicroscopy (UBM) and corneal topography. METHODS: Data from 42 eyes (13 males and 29 females) were analyzed in this study. The angle kappa was measured using Orbscan II and calculated with UBM and corneal topography. The angle kappa of the dominant eye was compared with measurements by Orbscan II. RESULTS: The mean patient age was 36.4 ± 13...
June 2017: Korean Journal of Ophthalmology: KJO
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