Data Processing • Calculating total threshold; • Calculating total losses; • Calculating mean losses; • Calculating mean sensitivity; •Analyzing mean defect; •Analyzing decrease in threshold for each test point; •Analyzing testing results before and after follow-up diagnosis. Functions Visual Field Testing • Qualitative testing on field of view; • Quantitative testing on each point of sight; • Fast threshold testing; • Full threshold testing; • Blind spot monitoring; •Test point re-testing; • Customized point testing. Monitoring Eye Fixation Searching Word Processing and Printing Lifting/Lowering Electronic Chinrest Automatic Vocal Instruction throughout Testing Practical, Convenient Database Searching Specifications: • Perimeter Type: Hemispherical Bowl Type (<T>600mm); • Stimulus Size: 02mm; • Stimulus Light Source: LED; • Stimulus Indicator: 256 indicators distributed on screen, including 62 red indicators (10° Central Area); • Stimulus Light Intensity: 0.5-318 nit (1.6-1.000ASB); • Stimulus Light Brightness Level: 15 levels, each level with 2dB; • Brightness Level of each Indicator: within ±20%; • Background Light Luminance: 0.02 cd/m2, white light (Spectrum range: 400nm-750nm, peak at 470nm); • Fixation Mark: Green, located at the center of the screen; • Stimulus Duration: 0.1s, 0.2s and 0.5s; • Stimulus Interval: 0.5s, Is and 2s; • Fixation Monitoring: Camera Monitoring & Blind Spot Monitoring; • Horizontal Distance between Chinrest Center and Screen Center: 330mm±16mm; • Moving Range of Chinrest: Vertically: >35mm; Horizontally: >15mm; • Weight: 26kg (Main Unit); • Dimensions: 770mm x 530mm x 730mm. Address: Room D, F3, Building C2, Xinmao Science Skill Park, Huayuan Industry Development Area, Tianjin, 300384, China

MD-820A Auto Perimeter Collecting patient information © Performing a visual field test and testing conditions © Selecting test points, and preparing for re-testing Q Loading desired records from database for follow-up diagnosis and analysis © Displaying patient’s detailed information MD-820A Auto Perimeter Single Field Report Customized testing Tailored to optometrist’s needs Testing Reports for a Patient Left: 2D Right: 3D