Frequency Doubling Technology (FDT) Mobile Visual Field Testing

2016-08-11 08:23:21 | BioPortfolio


This is a single center, prospective study to evaluate the efficacy and reproducibility of frequency doubling technology (FDT)-based visual field devices compared to conventional Humphrey Visual Field (HVF) perimetry. The investigators plan to enroll 500 patients in this study.


Glaucoma is a leading cause of irreversible and preventable blindness world-wide. Insufficient evidence exists to support routine screening for glaucoma in a primary care setting due to the relatively low prevalence of the disease (Guirguis-Blake, 2005 and Moyer, 2013). Frequency doubling technology (FDT)-based perimetry is a relatively inexpensive and portable visual field testing device with a short testing time that has shown reasonable efficacy, sensitivity and specificity in screening for glaucoma in clinic- and community-based settings (Mansberger, 2005 and Nomoto 2009).

The aim of our study is to compare the efficacy and reproducibility of FDT perimetry platforms compared with Humphrey Visual Field (HVF) perimetry (which is the gold clinical standard in clinics and hospitals) in detecting glaucomatous visual field defects.

Study Design

Endpoint Classification: Efficacy Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Diagnostic




FDT visual field, Standard HVF


Not yet recruiting


University of Miami

Results (where available)

View Results


Published on BioPortfolio: 2016-08-11T08:23:21-0400

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Medical and Biotech [MESH] Definitions

Partial or complete loss of vision in one half of the visual field(s) of one or both eyes. Subtypes include altitudinal hemianopsia, characterized by a visual defect above or below the horizontal meridian of the visual field. Homonymous hemianopsia refers to a visual defect that affects both eyes equally, and occurs either to the left or right of the midline of the visual field. Binasal hemianopsia consists of loss of vision in the nasal hemifields of both eyes. Bitemporal hemianopsia is the bilateral loss of vision in the temporal fields. Quadrantanopsia refers to loss of vision in one quarter of the visual field in one or both eyes.

A localized defect in the visual field bordered by an area of normal vision. This occurs with a variety of EYE DISEASES (e.g., RETINAL DISEASES and GLAUCOMA); OPTIC NERVE DISEASES, and other conditions.

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A subjective visual sensation with the eyes closed and in the absence of light. Phosphenes can be spontaneous, or induced by chemical, electrical, or mechanical (pressure) stimuli which cause the visual field to light up without optical inputs.

An ocular disease, occurring in many forms, having as its primary characteristics an unstable or a sustained increase in the intraocular pressure which the eye cannot withstand without damage to its structure or impairment of its function. The consequences of the increased pressure may be manifested in a variety of symptoms, depending upon type and severity, such as excavation of the optic disk, hardness of the eyeball, corneal anesthesia, reduced visual acuity, seeing of colored halos around lights, disturbed dark adaptation, visual field defects, and headaches. (Dictionary of Visual Science, 4th ed)

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Ophthalmology is the branch of medicine that is devoted to the study and treatment of eye diseases. As well as mild visual defects correctable by lenses, ophthalmology is concerned with glaucoma, uveitis and other serious conditions affecting the eye, ...

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