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Using Google Cardboard to Perform a Visual Field Screening Test Dhanraj Selvaraj Iowa State University

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Using Google Cardboard to Perform a Visual Field Screening Test Dhanraj Selvaraj Iowa State University Iowa State University Capstones, Theses and Graduate Theses and Dissertations Dissertations 2018 Using Google Cardboard to perform a visual field screening test Dhanraj Selvaraj Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/etd Part of the Engineering Commons Recommended Citation Selvaraj, Dhanraj, "Using Google Cardboard to perform a visual field screening test" (2018). Graduate Theses and Dissertations. 16461. https://lib.dr.iastate.edu/etd/16461 This Thesis is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Graduate Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. Using Google Cardboard to perform a visual field screening test by Dhanraj Selvaraj A thesis submitted to the graduate faculty in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Major: Mechanical Engineering Program of Study Committee: Greg Luecke, Major Professor Judy Vance Stephen Gilbert The student author, whose presentation of the scholarship herein was approved by the program of study committee, is solely responsible for the content of this thesis. The Graduate College will ensure this thesis is globally accessible and will not permit alterations after a degree is conferred. Iowa State University Ames, Iowa 2018 Copyright © Dhanraj Selvaraj, 2018. All rights reserved. ii DEDICATION I dedicate this thesis to my parents, Dr. Eunice Selvaraj and Dr. Selvaraj Rajendran, and my sister, Suganthi Selvaraj for their constant support, encouragement, devotion to my dreams and ambition to become an engineer. iii TABLE OF CONTENTS Page LIST OF FIGURES ............................................................................................................ v LIST OF TABLES ............................................................................................................ vii NOMENCLATURE ........................................................................................................ viii ACKNOWLEDGMENTS ................................................................................................. ix ABSTRACT ........................................................................................................................ x CHAPTER 1. INTRODUCTION ....................................................................................... 1 Virtual Reality Applications .......................................................................................... 1 Virtual Reality Headsets ................................................................................................ 1 Oculus Rift & HTC Vive.......................................................................................... 2 Google Cardboard .................................................................................................... 3 Visual Field .................................................................................................................... 5 Glaucoma ....................................................................................................................... 6 Humphrey Field Analyzer ............................................................................................. 6 Visual Field Easy ........................................................................................................... 8 CHAPTER 2. TECHNICAL DEVELOPMENT ................................................................ 9 Visual Field Test ............................................................................................................ 9 Google Cardboard ........................................................................................................ 15 Field Of View (FOV) ............................................................................................. 16 Unity3D .................................................................................................................. 16 CHAPTER 3. EXPERIMENTAL SETUP AND RESULTS ........................................... 17 Experimental Setup ...................................................................................................... 17 Display Device ....................................................................................................... 17 Google Cardboard Viewer...................................................................................... 18 Setting Up Unity3D ................................................................................................ 20 Developing The Application .................................................................................. 22 Results ......................................................................................................................... 25 CHAPTER 4. DISCUSSION AND CONCLUSION ....................................................... 30 Discussion .................................................................................................................... 30 Conclusion ................................................................................................................... 32 REFERENCES ................................................................................................................. 34 iv APPENDIX A. CODE FOR APPLICATION .................................................................. 36 APPENDIX B. EXCEL DATA RESULTS ...................................................................... 45 Data results for 3 x 3 light pattern ............................................................................... 45 Data results for 7 x 7 light pattern ............................................................................... 46 v LIST OF FIGURES Page Figure 1-1 Oculus Rift [3] ................................................................................................ 2 Figure 1-2 HTC Vive [4] ..................................................................................................... 3 Figure 1-3 Google Cardboard [6]....................................................................................... 4 Figure 1-4 Visual Field of Right Eye [8] ............................................................................. 5 Figure 1-5 Humphrey Field Analyzer ................................................................................. 7 Figure 2-1 Visual Field Test using the Humphrey Field Analyzer (HFA) [16] ................ 10 Figure 2-2 Diagram of visual field of the right eye. The three regions of the field are the central field (0 to 30 degrees), the peripheral field (30 to 60 degrees), and the temporal crescent. [18] .................................................... 11 Figure 2-3 30-2 pattern: The distribution of the target light spots are at equal distances from the horizontal axis at 3 degrees. [8] ..................................... 12 Figure 2-4 HFA Visual Field Test Results (Left Eye) ....................................................... 13 Figure 2-5 HFA Visual Field Test Results (Right Eye) ..................................................... 14 Figure 2-6 Google Cardboard .......................................................................................... 15 Figure 3-1 Nexus 6P.......................................................................................................... 18 Figure 3-2 Google Cardboard Viewer Parts [25]............................................................. 20 Figure 3-3 Track Rotation and Track Position disabled in the Inspector (Screenshot) ... 21 Figure 3-4 Field Of View set to 30 degrees (Screenshot) ................................................. 22 Figure 3-5 Initialized 7 x 7 Light Pattern.......................................................................... 23 Figure 3-6 Light Pattern (3 X 3) ....................................................................................... 25 Figure 3-7 Right Eye Light Pattern Results (3 X 3) .......................................................... 27 Figure 3-8 Left Eye Light Pattern Results (3 X 3) ............................................................ 27 Figure 3-9 Left Eye Light Pattern Results (7 X 7) ............................................................ 28 vi Figure 3-10 Right Eye Light Pattern Results (7 X 7) ........................................................ 29 Figure 4-1 Right Eye Visual Field Test Results using Google Cardboard (Left Image) and Right Eye Humphrey Field Analyzer Results (Right Image) ..... 32 vii LIST OF TABLES Page Table 1 Nexus 6P Specifications [24] ............................................................................... 17 Table 2 Google Cardboard Specifications [25] ................................................................ 19 Table 3 Right Eye Results (3 x 3 Pattern)......................................................................... 26 Table 4 Left Eye Results (3 x 3 Pattern) ........................................................................... 26 viii NOMENCLATURE VR Virtual Reality HFA Humphrey Field Analyzer FOV Field Of View ix ACKNOWLEDGMENTS I would like to thank my Father, God Almighty for blessing me with this opportunity, and helping me with the process, by giving me strength, perseverance, wisdom and everything I needed to accomplish to be where I am today. To Dr. Greg Luecke, my major professor, I am ever grateful to him for
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