Humphrey Zeiss FDT 710

Key features of the FDT visual field instrument include:
- Supra-threshold screening tests in less than 1 minute per eye
- Threshold tests at around 4 minutes per eye
- Easy to use; no special training 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 patient's refraction)
- No eye correction required for the opposite (untested) 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 upgradeability for future enhancements

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

Test
Screening strategies Test:
- Supra-threshold 20° (SCREENING C-20 - 1)
- Supra-threshold 20° (SCREENING C-20 - 5)
- Supra-threshold 20° (SCREENING N-30 - 1)
- Supra-threshold 20° (SCREENING N-30 - 5)
Test threshold strategies:
- Threshold 20° (THRESHOLD C-20)
- Nasal Threshold 30 ° (THRESHOLD N-30)
- computer MONSTERS automated staircase thresholding procedure
- Staircase completion consists of at least four staircase repeats as
well as upper and lower staircases stair limits within 0.3 log10 units of
each other.
- MONSTER threshold is calculated as the average of the last upper and
lower presentations meeting the staircase completion criteria.

Reliability indices:
- 3 capture trials in C-20 and N-30 screening tests
- 6 capture trials in SEUIL TESTS C-20 and N-30
- False positive capture tests:
- 6 capture tests in SEUIL C-20 TESTS
- 8 capture tests in SEUIL N-30 TEST
- False negative capture tests:
- capture test contrast 0 dB (~ 100% )
- 3 capture trials in SEUIL C-20 TEST
- 5 capture trials in SEUIL N-30 TEST

Stimulus:
- 17 or 19 FDT patterns plus OD and OS capture fixation trial patterns
(4 patterns per visual field quadrant plus a 5° central radius pattern)

Screening Test results:
- Field of Deviation 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 capture test ratios

Results Test threshold:
- Threshold (dB) Plot
- Deviation Plot with 5 probability level classifications (P> = 5% , P