Humphrey FDT
Expanding your field of vision. ZEISS Humphrey FDT

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Humphrey FDT

  • Highlights
    Humphrey FDT 400

    Humphrey FDT - Frequency Doubling Technology for efficient visual field loss detection

    Clinically validated

    The Humphrey FDT® is ideal for clinics desiring to identify patients in need of ophthalmological referral. It has been clinically validated in more than 170 peer-reviewed publications.

    Easy to operate and interpret
    The FDT is optimized for use in both ophthalmological and non-ophthalmological settings and
    may be operated by healthcare workers having little or no specialty training in ophthalmology.

    • Patients may be tested using their own glasses, no requirement for trial lenses or eye patches1
    • Short test: ~ 40 seconds per eye
    • Simplified interpretation of results
    • Large, age-related normative database
    • Compact design that fits anywhere in your practice
    • Easy and intuitive operation for users of any level of experience
    • Dependable performance in ambient light
    • Convenient low-cost, built-in printer*


    *FDT does not include electronic connectivity.

  • Technical Data
    Test Specifications

    Maximum temporal range (degrees)


    Stimulus duration


    Visual field testing distance


    Background illumination

    100 cd/m2
    Threshold test libraries C-20, N-30
    Threshold test strategy MOBS
    Screening test libraries C-20, N-30
    Screening test modes Age corrected
    Fixation control
    Heijl Krakau blind spot monitor
    Operator interface (display) LCD
    Stimulus Frequency doubling
    Stimulus sizes 10°
    Printer Thermal printer


    17'' (43 cm)


    10'' (25 cm)


    19'' (48 cm)


    19 lbs (8.6 kg)
    Electrical requirements 100-120 V, 50/60 Hz
    230 V, 50/60 Hz
    Standards Meets UL, CSA, and CE standards
  • Services


    Support whenever you need it

    Do you rely on high system availability? If your answer is yes, then why not consider our ZEISS OPTIME service agreements, which are designed to ensure the readiness of your medical equipment at all times.

    More about ZEISS OPTIME

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    Benefit from our customer care packages

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  • Downloads

    Detect vision loss from ocular diseases Humphrey FDT Perimeter

    Simple, Reliable, Proven

    page(s): 6
    file size: 699 kB

    Humphrey FDT Data Management Goals and Solutions

    Application Note

    page(s): 2
    file size: 1,284 kB

    Adjunctive Use of FDT in Detection of Ocular Disease

    Commentary on a paper by Ravi Thomas et al(1) By Dr. Vincent Michael Patella

    page(s): 8
    file size: 75 kB

    The Humphrey FDT: Analyzing the FDT Screening Printout

    Application Note

    page(s): 8
    file size: 850 kB

    Humphrey Matrix and Humphrey FDT from ZEISS

    Compendium of peer-reviewed, published clinical articles

    page(s): 64
    file size: 1,083 kB

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Related Products

  • 1 Trial lenses are required beyond ± 3 diopters for the Matrix and beyond ± 7 diopters for the FDT.