Find Frequency Doubling Perimetry Tests

Frequency Doubling Perimetry Technology or Frequency Doubling Technology (FDT) Perimetry is a procedure used to detect visual field loss caused by Glaucoma and other Ophthalmological diseases. An enhanced version of FDT Perimetry has been released called the Humphrey visual field test or the Humphrey Matrix. FDT Perimetry was designed to identify peripheral vision and sensitivity loss produced by various visual disorders, including Neuro-ophthalmological diseases like Thyroid Eye Disease, Ischemic Optic Neuropathy and Blepharospasm.

Features of Humphrey FDT’s and other FDT Perimeters often include quick test time; often under a minute per eye, small footprint for a fit in every practice and ease of use as well as full threshold test results in less than five minutes. This allows a practice an efficient and rapid method of testing patients for visual disorders while maintaining patient comfort and convenience.

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Guided Progression Analysis™ (GPA™)

Carl Zeiss Meditec, Inc.

Stimulus: Inquire
Fixation Control: Inquire
Test Strategies: Inquire
Analysis Software: Inquire

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Humphrey® FDT Perimeter – Simple, Reliable, Proven

Carl Zeiss Meditec, Inc.

Stimulus: Frequency Doubling
Fixation Control: Automatically occludes the untested eye
Test Strategies: Supra-threshold screening tests in only 40 seconds, the FDT enables efficient screening for all patients. Full threshold testing in under 4 minutes.
Analysis Software: Large age-related normative database

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Humphrey® Matrix Perimeter with Frequency Doubling Technology - Proven to find early visual field loss. Quickly. Easily.

Carl Zeiss Meditec, Inc.

Stimulus: Frequency doubled sinusoidal gratings
Fixation Control: Video eye monitoring. Heijl-Krakau fixation method. Alternative fixation targets.
Test Strategies: 24-2 FDT Full Threshold, 30-2 FDT Full Threshold, N-30 FDT Full Threshold, 10-2 FDT Full Threshold, Macula FDT Full Threshold Screening, N-30 FDT Supra-threshold, 24-2 FDT Supra-threshold
Analysis Software: Glaucoma Hemifield Test (GHT)

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