Comparison of Automated and Manual Measurements of Horizontal Corneal Diameter in Contact Lens Wearers Using Orbscan Eye Metrics Function and Orbscan 11z.

Slides:

Advertisements

Similar presentations

Objectives 10.1 Simple linear regression

Advertisements

© McGraw-Hill Higher Education. All Rights Reserved. Chapter 2F Statistical Tools in Evaluation.

Pooja B. Jamnadas, MD, Peter Russo, OD, William Bonk, Shuchi Patel, MD Loyola University Chicago, Stritch School of Medicine, Department of Ophthalmology,

Comparison of corneal astigmatism measured with 3 devices Mariko Shirayama, M.D, Li Wang, M.D, PhD, Mitchell P. Weikert, M.D, Douglas D. Koch, M.D. Cullen.

Agreement Between Corneal Topography with the Dual-Scheimpflug Placido Corneal Topographer, Scheimpflug Corneal Topographer, and Scanning-Slit Topography.

Purpose We studied the interdevice agreement of three systems in the different measurements of the corneal and anterior segment biometric parameters. The.

Research Study on Wind Turbine Acoustics DRAFT March 7, 2014 Interim Results II for WNTAG.

Method Comparison A method comparison is done when: A lab is considering performing an assay they have not performed previously or Performing an assay.

Sample size calculation

Repeatability of Anterior and Posterior Corneal Higher- Order Aberrations in 4 mm, 6 mm and 8 mm diameters measured by Pentacam System Jadwiga Wojtowicz.

Ankle fractures have features of an osteoporotic fracture Kyoung Min Lee MD Department of Orthopaedic Surgery Seoul National University Bundang Hospital.

Data Analysis. Quantitative data: Reliability & Validity Reliability: the degree of consistency with which it measures the attribute it is supposed to.

Comparison of Orbscan and Ultrasound Pachymetry Measurements Faik Orucov, MD, Abraham Solomon, MD,Ziv Caspi, David Landau, MD, Eyal Strassman, MD, and.

Biostatistics: Measures of Central Tendency and Variance in Medical Laboratory Settings Module 5 1.

Education Research 250:205 Writing Chapter 3. Objectives Subjects Instrumentation Procedures Experimental Design Statistical Analysis  Displaying data.

MEASURES OF CENTRAL TENDENCY TENDENCY 1. Mean 1. Mean 2. Median 2. Median 3. Mode 3. Mode.

Hong Kong Eye Hospital Ms Frenchy Chiu Dr Victoria Wong IOL master

Introduction to Linear Regression

Seyed Javad Hashemian MD Eye Research Center Rasoul Akram Hospital Tehran University of Medical Sciences No financial interest

Lecture 8 Simple Linear Regression (cont.). Section Objectives: Statistical model for linear regression Data for simple linear regression Estimation.

Prospective Correlation of Symptoms and Clinical Grading in Vernal Keratoconjunctivitis Patients Srikant K Sahu, Shraddha Pawan Sureka, Sujata Das, Apurva.

Reproducibility of Optical Measurements in Pseudophakic eyes Using Double-Pass Measurement System St Thomas Hospital, London Anish Dhital, David Spalton,

ECON 338/ENVR 305 CLICKER QUESTIONS Statistics – Question Set #8 (from Chapter 10)

ELEVATION AND PACHYMETRY VALUES IN NORMAL CORNEAS OBTAINED BY GALILEI ASCRS Boston April Vision Sana Research Group Vision Sana Research Group.

Endothelial Keratoplasty in Patients With an Anterior Chamber Intraocular Lens: A Montreal Experience Georges M. Durr, MD 1,2 Johanna Choremis, MD, FRCSC.

Comparison of Central Corneal Thickness and Peripheral Corneal Thickness using Sheimpflug system, Optical Coherence Tomography and Ultrasound Pachymetry.

1 Non-contact Specular Microscopy for Evaluation of Corneal Endothelium in Early Fuchs’ Endothelial Corneal Dystrophy Jianyan Huang 1, MD, PhD; Tudor Tepelus.

REFRACTIVE OUTCOMES WITH TORIC ICL IMPLANTS CHIEF AUTHOR: Dr. D.RAMAMURTHY CO – AUTHOR: Dr. R.CHITRA The authors have no financial interest in the subject.

Adriana S. Forseto1, MD Walton Nosé1,2, MD

Assessment of Changes in Corneal Scar Density After Primary Pterygium Excision with Adjuvant Mitomycin C.

Evaluation of Corneal Tomography in Primary Pterygium Sahil Goel, MD (Presenting Author), Murugesan Vanathi MD *The authors have no financial interests.

Confidence Interval Estimation For statistical inference in decision making: Chapter 9.

POLS 7000X STATISTICS IN POLITICAL SCIENCE CLASS 5 BROOKLYN COLLEGE-CUNY SHANG E. HA Leon-Guerrero and Frankfort-Nachmias, Essentials of Statistics for.

Regression Analysis Deterministic model No chance of an error in calculating y for a given x Probabilistic model chance of an error First order linear.

LogMAR-Analysis of multifocal intraocular lenses: Clinical performance A. Mannsfeld, I.-J. Limberger, A. Ehmer, M.P. Holzer, G. U.Auffarth International.

Jae Lim Chung MD, MBA 1,3 ; Jin Pyo Hong MD 2,3 ; Kyoung Yul Seo MD, PhD 3 ; Eung Kweon Kim MD, PhD 3 ; Tae-im Kim MD, PhD Noo Ne Eye Hospital, Seoul,

Comparison of Central Corneal Thickness, Anterior Chamber Depth, and Central Corneal Power Measurements between Two Scheimpflug Imaging Systems Yuichi.

Chapters 8 Linear Regression. Correlation and Regression Correlation = linear relationship between two variables. Summarize relationship with line. Called.

Minimizing Risk in Visian ICL Implantation.

Confidence Intervals Dr. Amjad El-Shanti MD, PMH,Dr PH University of Palestine 2016.

John P Berdahl M.D.* David R. Hardten M.D., F.A.C.S.* *No relevant financial disclosures.

Poster# P36 Comparison of Techniques of Measuring Anterior Chamber Depth and Corneal Curvature in Indian Eyes Sujata Das, MS, FRCS Anjula Kumari, B.Optom.

CORNEAL ENDOTHELIAL PROFILE AFTER FERRARA RING IMPLANTATION Leonardo Torquetti, MD, PhD Paulo Ferrara, MD, PhD Paulo Ferrara Eye Clinic Belo Horizonte.

DEVELOPING AND TESTING THE STANDARD OF PRACTICE AND EVALUATION OF CRITICAL-CARE-NURSING TOOL (SPECT) FOR GRADUATES OF CRITICAL CARE NURSE EDUCATION PROGRAMS.

Use of the ICare Home Rebound Tonometer for home self-monitoring of intraocular pressure in a Singaporean population Jeanne Joyce OGLE1, Wai Cheng SOO.

Anterior Segment OCT in Strabismus

Suppressive effect of combined treatment of orthokeratology and 0

Characteristics of Primary Angle-Closure Glaucoma Patients with Normal Intraocular Pressure at the First Visit Won Hyuk Oh1, Bum Gi Kim1, Joo Hwa Lee2.

Postoperative Refraction and Patient Satisfaction after Bilateral Implantation of Presbyopia-Correcting Intraocular Lenses Robert Cionni, MD Financial.

17100 Contact lens fitting after corneal CXL

Hôpital Ophtalmique Universitaire

Early Experience with Descemet’s Stripping Automated Endothelial Keratoplasty Combined with Phacoemulsification: Clinical and Refractive Outcome University.

Johnson CH TAN, MBBS, MRCSEd(Ophthalmology)

Comparison of corneal powers obtained from four different devices

Comparison of the Visian Implantable Collamer Lens with the Verisyse Phakic Intraocular Lens in High Myopia Jigna Joshi MD Marian Macsai MD Parag Majmudar.

Regression Computer Print Out

Comparison of Autokeratometry and Manual Keratometry

Eric Dai MD, Pawan Prasher MD, James McCulley MD, R. Wayne Bowman MD.

Vicente J. Correa-Gomez MD, Guillermo Tapia MD, Oscar Macias Manuel MD, Alejandro Navas Perez MD, Gilberto Islas MD, Tito Ramírez-Luquin MD, Enrique O.

Conventional LASIK V/S Zyoptix LASIK

Traumatic Wound Dehiscence After Corneal Keratoplasty

Cheil Eye Hospital , Daegu, Korea

Factors Potentially Affecting the Accuracy of Methods to Calculate Effective Refractive Power After Keratorefractive Surgery Helga P Sandoval, MD, MSCR,

Bernilla E; Izquierdo Jr. L; Miranda M.

Peter Lee MD, Howard Gimbel MD, Maria Ferensowicz MA

Effect of Sample size on Research Outcomes

Khairidzan Mohd Kamal MD

John C. Hwang, MD MBA Edward S. Harkness Eye Institute

International Vision Correction Research Centre

Michael Goodman, Alexandra Paul and Andrew Hsu

Presentation transcript:

Comparison of Automated and Manual Measurements of Horizontal Corneal Diameter in Contact Lens Wearers Using Orbscan Eye Metrics Function and Orbscan 11z Corneal Topographer Dr Venkataraman Arvind MD , MRCOphth. M.Krithiga B.S.(Optom) Vasan Eye Care Hospital, Chennai, India

Financial disclosure The authors have no financial interest in this study or presentation

AIM Comparison of automated and manual measurements of horizontal corneal diameter in contact lens wearers using Orbscan Eye Metrics Function and Orbscan 11z corneal topographer.

METHODS Automated White to White (WTW) measurement was obtained from the Orbscan II. Using the Eye metrics function the WTW was measured manually by two observers along the five point corneal reflections on the Orbscan real image. The data was analysed using Statistica software for correlation ,reliability and Inter-rater repeatability.

Orbscan WTW

WTW WITH EYEMETRICS 5 point corneal reflections through which WTW is measured

Results 73 eyes of 37 patients were included in the study. 25 females and 12 males. Average duration of contact lens usage was 34 months (range 16-52 months). All of them were using soft contact lenses

Results MEAN RANGE S.D CONFIDENCE INTERVAL ORBSCAN Automated 11.74 10.7-12.35 0.32 11.66-11.81 OBSERVER A Manual 12.03 10.96-12.60 0.33 11.95-12.11 OBSERVER B 11.92 10.90-12.50 11.84-11.99

Results Orbscan Obs A Obs B

RESULTS Manual measurements (Observer A&B) using eye metrics was statistically different compared to the automated measurements of Orbscan (p<0.001). Standard deviation difference Orbscan Vs OB-A is 0.19 Orbscan Vs OB-B is 0.10

Results Correlation R 0.0009(p>0.05). Slope -0.008 (P>0.05). Intercept -0.079 (P =0.05).

Results Observer A – Observer B Average of measurements of Observer A & B Correlation R 0.0043(p>0.05). Slope -0.0336 (P>0.05). Intercept 0.468 (P =0.05).

Results Horizontal corneal diameter by manual Eye metrics measurements are longer than Orbscan derived measurements. Manual measurement shows higher inter-rater variability and test – retest variability. Variations tend to decrease with repeat measurements.

Conclusion Orbscan IIz corneal topographer underestimates the WTW especially in long term contact lens wearers. This error can be reduced by manual measurements using Eye metrics software. Manual corneal measurement can be very useful in patients with pannus and other peripheral corneal changes. This method will be very useful adjuvant to automated measurement of corneal diameter in selection of Phakic intraocular lenses ( ICLs) and ACIOLs.

Thank you