Used ZEISS Humphrey FDT 710

Key features of the FDT visual field instrument include: • Supra-threshold screening tests in less than 1 minute per eye • Threshold tests in approximately 4 minutes per eye • Easy to use; no special training is required / minimal operator instruction • No correction (trial) lens required; Patients can wear their own correction or none at all (must only be within 6D of the patients refraction) • No eye correction needed for the (untested) opposite eye - it is automatically occluded • Unaffected by ambient lighting - can be used in normal room lighting • Unaffected by pupil size (as small as 2 mm) • Extensive built-in normative age reference database • World-class clinical validation by leading researchers in the field • Software upgrade capability for future improvements Instrument Dimensions: 25 cm [10] wide x 48 cm [19] deep x 43 cm [17] high Electrical Connection: 320-IEC standard power input connector for worldwide use Computer Interface: RS-232 Serial D 9-pin male connector, null-modem cable, Operating Conditions Storage and Shipping Conditions Testing Strategies Test: • 20° Supra-Threshold (C-20 SCREENING - 1) • 20° Supra-Threshold (C-20 SCREENING - 5) • 20° Supra-Threshold (N-30 SCREENING - 1) • 20° Supra-Threshold (N-30 SCREENING - 5) Testing Threshold Strategies: • 20° Threshold (C-20 THRESHOLD) • 30° Nasal Threshold (N-30 THRESHOLD) • MONSTERS computer automated stair thresholding procedure • Stair completion consists of at least four stair repeats, with upper and lower stair limits within 0.3 log10 units of each other. • MONSTERS threshold is calculated as the average of the last upper and lower presentations meeting the stair completion criteria. Reliability indices: • 3 capture trials in C-20 and N-30 screening tests • 6 capture trials in C-20 and N-30 threshold tests • False positive capture trials: • 6 capture trials in C-20 threshold test • 8 capture trials in N-30 threshold test • False negative capture trials: • 0 dB contrast capture trial (~100%) • 3 capture trials in C-20 threshold test • 5 capture trials in N-30 threshold test Stimulus:
• 17 or 19 FDT patterns as well as fixation capture trial patterns OD and OS (4 patterns per visual field quadrant plus a 5° central radius pattern) Screening Test Results: • Deviation field with 4 qualitative loss classifications (within normal limits, slight relative loss, moderate relative loss, severe loss) based on age-related normative references • Reliability indices: fixation and capture ratios of false positive trials Test Threshold Results: • Threshold (dB) Plot • Deviation field with 5 probability level classifications (P ≥ 5%, P < 5%, P < 2%, P < 1%, P < 0.5%) based on age-related normative references • MD (mean deviation) and PSD (Patient of Standard Deviation) global statistics Index values ​​with 5 probability level classifications (P ≥ 5%, P < 5%, P < 2%, P < 1%, P < 0.5%)