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Humphrey FDT Model 710

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The FDT Visual Field Instrument is an innovative, efficient, compact and affordable
automated visual field testing instrument. Years of research and clinical trials of patented
Frequency Doubling Technology have resulted in an instrument which provides rapid,
clinically validated and user-friendly visual field testing.

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Humphrey FDT Model 710

The FDT Visual Field Instrument is an innovative, efficient, compact and affordable
automated visual field testing instrument. Years of research and clinical trials of patented
Frequency Doubling Technology have resulted in an instrument which provides rapid,
clinically validated and user-friendly visual field testing.
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 needed/minimal operator instruction
• No corrective (trial) lens needed; patients can wear their own correction or none at all
(must only be within 6D of patient’s refraction)
• No eye patch needed for the opposite (untested) eye - it’s automatically occluded
• Not affected by ambient lighting - can be used in normal room lighting
• Not affected by pupil size (as small as 2 mm)
• Extensive age-normative reference database incorporated
• World-class clinical validation by leading researchers in the field
• Software upgrade capability for future enhancements

Instrument

Dimensions: 25 cm [10''] wide x 48 cm [19''] deep x 43 cm [17''] high
Weight: Less than 9 kg [20 lbs.]
Patient display size: 40° horizontal by 40° vertical square
Power requirements: 115/230 V~, 50/60 Hz, 0.4/0.2 A,
Power Connection: IEC-320 standard power inlet connector for worldwide use
Power Cord: Approved power cord
Computer Interface: RS-232 Serial, 9-pin D male connector, null-modem cable
Printer: High-speed, high-resolution internal thermal printer

Environmental

Operating Conditions
Temperature: +15° C to +35° C
Humidity: 10% to 90% non-condensing
Pressure: 700 hPa to 1060 hPa
Altitude: Up to 3000 m above sea level

Storage and Shipping Conditions
Temperature: -20° C to +49° C
Humidity: 0% to 95% non-condensing
Pressure: 700 hPa to 1060 hPa

Test

Screening Test Strategies:
• Supra-threshold 20° (SCREENING C-20 - 1)
• Contrast values: p = 1% (2 times), p = 0.5%, maximum contrast
• Supra-threshold 20° (SCREENING C-20 - 5)
• Contrast values: p = 5% (2 times), p = 1%, maximum contrast
• Supra-threshold 20° (SCREENING N-30 - 1)
• Contrast values: p = 1% (2 times), p = 0.5%, maximum contrast
• Supra-threshold 20° (SCREENING N-30 - 5)
• Contrast values: p = 5% (2 times), p = 1%, maximum contrast

Threshold Test Strategies:
• Threshold 20° ( THRESHOLD C-20)
• Threshold Nasal 30° ( THRESHOLD N-30)
• MOBS computer automated staircase thresholding procedure
• Initial Contrast: p = 0.5% contrast level
• Staircase completion consists of at least four staircase reversals as well as upper and lower
staircase boundaries within 0.3 log10 units of each other.
• MOBS threshold is calculated to be the mean of the last upper and last lower presentations satisfying the staircase completion criteria.

Reliability Indices: • Fixation Monitoring: Heijl-Krakau fixation monitor • Catch trial contrast: 6 dB (~ 50%) • 3 catch trials in SCREENING C-20 and N-30 TESTS • 6 catch trials in THRESHOLD C-20 and N-30 TESTS • Presentation Order: Pseudo-Random • Pattern: 1° diameter circular FDT stimulus • False Positive Catch Trials: • Catch trials contrast: 56 dB (~ 0%) • 3 catch trials in SCREENING C-20 and N-30 TESTS • 6 catch trials in THRESHOLD C-20 TEST • 8 catch trials in THRESHOLD N-30 TEST • Presentation Order: Pseudo-Random • False Negative Catch Trials: • Catch trial contrast 0 dB (~ 100%) • 3 Catch trials in THRESHOLD C-20 TEST • 5 Catch trials in THRESHOLD N-30 TEST • Presentation Order: Pseudo-Random • Pattern: 1 of 17 FDT Patterns, Random

Stimulus: • 17 or 19 FDT patterns plus OD and OS fixation catch trial patterns (4 patterns per visual field quadrant plus a central 5° radius pattern) • Presentation Order: Random • Spatial Frequency: 0.25 cycles/degree, cosinusoidal modulation • Temporal Frequency: 25 Hz counter-phase flicker • Duration: 200 to 400 ms • Color: black and white • Mean Background Illumination: 100 cd/m2 nominal • Contrast Range: 56 dB (~ 0%) to 0 dB (~ 100%) in log10 steps • Interstimulus Internal: 0 to 500 ms, Random
Screening Test Results: • Deviation Plot with 4 qualitative loss classifications (Within Normal Limits, Mild Relative Loss,Moderate Relative Loss, Severe Loss) based on age-related normative references • Reliability Indices: Fixation and False Positive Catch Trials ratios Threshold Test Results: • Threshold (dB) Plot • Deviation Plot 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 (Pattern Standard Deviation) statistical Global Indices values with 5 probability level classifications (P> = 5%, P<5%, P<2%, P<1%, P<0.5%) based on age-related normative references • Reliability Indices: Fixation, False Positive, and False Negative Catch Trials ratios

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