Computer Analyzer for Field of Vision Giorgi Gigilashvili, PhD student at Deparment of Biomedical Engineering, Georgian Technical University Supervisor: Prof. Zviad Gurtskaya Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia History 1945 First perimeter system designed by Goldmann
1970 Octopus perimeter was first introduced 1982 Humphrey field analyzer displayed at AAO 1983 First clinical trials showed by Michael Patella 1984 Became popular in clinical environment
Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Perimetry Perimetry is the measurement of visual functions of the eye at topographically defined centers in the visual field Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia
Uses of Perimetry Glaucomatous field defects Chorioretinal lesions Optic disc lesions
Optic nerve lesions Neuro-ophtalmic lesions Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Techniques of Visual Field Analysis
Visual field can be charted by using kinetic and/or static techniques with instruments that are operated either manually or automatically (computerized) Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Kinetic Perimetry Kinetic Perimetry (Manual) Stimulus is moved from a non-seeing area to seeing area to the point at which it is firstly observed by the patient in relation to fixation point.
The operator selects the stimulus (target), size and intensity, moves the target from periphery close to central area of eyesight, monitors patient eye fixation. Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Static Perimetry Static Perimeter Computerized
Static technique involves the presentation of static test objects Static method represents an on off technique during which each stimuli is presented to the patient for the duration of 0.5-1 second and the points (targets) which patient failed to detect are recorded. Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Parameters of Perimetry
Instrument Variables: Stimulus size Stimulus duration Background Luminance Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia
Kinetic VS Static Perimetry Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Computed Perimetry System for Visual Field Testing Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Computed Perimetry System for Visual Field
Testing Hemisphere Control module for stimuli presentation Diagnostic module
Patient gaze fixation control module Presented at 6-th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Computed Perimetry System for Visual Field Testing Electric scheme of connections of light-emitting diodes Presented at 6-th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Computed Perimetry System for Visual Field Testing
Main Switching Board with Microcontroller PIC16 F887 Presented at 6-th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Computed Perimetry System for Visual Field Testing Basic Scheme of Switching Device Presented at 6-th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Computed Perimetry System for Visual Field Testing
Microcontroller PIC16 F88 Specifications Presented at 6-th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Computed Perimetry System for Visual Field Testing Eye Pupil Movement Controlling Module (Gaze fixation monitoring module) Monitoring and control of eye pupil movement is performed by built in video camera
Coordinates of eye pupil location during the start of examination are stored in the database During the examination process eye pupil location is constantly compared to stored data to discern eye movement Fixation is also tested by mapping of the blind spot Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia
Computed Perimetry System for Visual Field Testing Eye Pupil Movement Controlling Module Current and Future Plans Modification and upgrade of current computed perimetry system Integrated PC
Integrated touch screen monitor Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Current and Future Plans Mini PC x86 L-20Y D525 Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Current and Future Plans CPU D525 ATOM Dual core 1.8 MHz
Mini INTEL PC Specifications: RAM DDR3 SO-DIMM (2GB) Dimension 19.7 X 19.7 X 4cm Graphics Integrated intel3150(GMA3150)graphics Hard Drive
128 GB Resolution 1366x786, 1024x600, 800x600, 640x480 Weight 2.5 KG Supported OS WIN7, Linux, Windows XP, Ubuntu,Debian I/O Ports:
4 x USB, VGA, MIC, SPK, RJ45 LAN RS232 YES WIFI YES Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Current and Future Plans 10 inch touch screen monitor Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia
Current and Future Plans Scren size Mini 10 PCInch Specifications: Color Multicolor Screen Ratio: 4X3
Touch signal input RS232 or USB Touch sensibility >3mm Response Time < 16 mS Optimal resolution 1024 x 768, 800 x 600
Brightness 350 cd/m2 Signal input DVI or VGA Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Computed Perimetry System for Visual Field Testing Advantages of Computed Perimetry System for Visual Field Testing
The data is quantifiable, reproducible and amenable for statistical manipulation An automated technology reduces the need for highly trained technicians/operators Elimination of outcomes of possible subjectivity of perimetrist and/or patient
Automated perimetry is more accurate and informative Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Computed Perimetry System for Visual Field Testing International Education Fair, Tbilisi 2014 Independence Day, Tbilisi 2014 Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Computed Perimetry
System for Visual Field Testing THANKS Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia Computed Perimetry System for Visual Field Testing Questions and Discussion Presented at 6th Georgian-German School and Workshop in Basic Science, July 2014, Tbilisi, Georgia
