The Visual field (VF) test is a widely used, noninvasive technique for evaluating pathology or dysfunction in the visual pathways. It is one of the basic diagnostic tools of ophthalmology. The VF test, in conjunction with other diagnostics, is especially useful in the detection of glaucoma and for following its progression.


→ vf progression expert: statistical analysis of the visual field progression

BioFormatix’s Visual Field (vf) Progression Expert produces a quantitative estimate of visual field progression probability. It is based on proprietary, population-based model of noise in the visual field test (patent pending). Large database of perimetry tests from the Advanced Imaging for Glaucoma (AIG) Study was used in development and validation of the progression model.

Product sheet (PDF)



→VFExpertTM / GSP: Diagnostic aid software for the visual field test

Early detection of glaucoma is critical, as blindness from the disease is preventable in nearly all cases if treatment is promptly administered. BioFormatix has applied novel machine learning approaches to the problem of glaucoma diagnosis via an automated analysis of visual field data. Our integrated and user friendly decision-aid software program facilitates and standardizes the task of interpreting the visual field test by providing a reliable and detailed classification of glaucomatous and non-glaucomatous defects. The newly devised GLI (glaucoma likelihood index) provides numerical summary of a multi-level classification and may be potentiallly used as a measure of glaucoma progression. Customized versions of VFExpertTM program are used by:

VFExpert Diagram

VFExpertTM produces clinically relevant classifications of perimetry measurements

Publication download:

Glaucoma detection and evaluation through pattern recognition in standard automated perimetry data



→VirtualEye® Perimeter: Testing of visual field with virtual reality goggles

VirtualEye® is a lightweight, high-performance head-mounted apparatus for the visual field test. The device

permits unprecedented freedom of movement of the head and body, thus minimizing the stress and fatigue

commonly associated with conventional visual field testing systems.

A flexible, computerized platform and state-of-the art display technology enables easy re-configuration

of the system to accommodate emerging and future test scenarios. Onboard gaze tracking device increases

test reliability and accuracy, and enables hands-free operation.


The device performs the equivalent of full threshold 24-2 visual field testing in two modes: (1) manual

(subjective), with patient response registered with a mouse click and (2) visual grasp (objective), where

the eye tracker senses an appropriate change in gaze as evidence of target acquisition.


Clinical studies showed high level of patients' satisfaction with the device comfort and performance

(most subjects preferred VirtualEye over the standard stationary perimeter), and its usefulness in testing

of the visual field.


Testing of Visual Field with Virtual Reality Goggles in Manual and Visual Grasp Modes (free download)


Patient's view of VirtualEye head-mounted visor. The device is secured on patient's head with adjustable headband (top of the picture).

Components of VirtualEye Perimeter