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The TrueField® Analyzer – Objective Perimetry

November 5, 2008 in Technology

TrueField Analyzer

The TrueField® Analyzer (TFA) makes objective visual field testing a clinical reality. It combines objectivity with “non-contact” ease of use, making it easy for technicians and patients, and gives clinicians objectivity when assessing their patient’s condition.

Assessing both eyes concurrently the TFA tests are fast and can be run in both full-test and screening modes. The test’s bilateral concurrency allows the consensual light reflex to be exploited to identify bilateral asymmetries and to improve test accuracy. Most importantly the TFA makes objective perimetry a clinical reality.

The TrueField Analyzer – objective perimetry made fast and easy.

TFA Stimulus – Bilateral View

November 5, 2008 in Technology | No comments

This video shows an example of the F30-1 Standard Stimulus pattern*. It presents the stimulus in a bilateral view showing the stimulus pattern for the OS/Left retina on the left, and the pattern for the OS/Right retina on the right. The stimulus is presented to the patient in a dichoptic format and the patient automatically fuses these independent stimulus patterns into a single cyclopean view of the stimulus.

*The limitations of delivering this video over the WWW reduce the frame rate of the playback – it looks to play a lot slower here than the real stimulus in the device. Despite these limitations, the video does give you the basic idea of what is presented to the patient in the device.

TFA Pupil Responses

November 5, 2008 in Technology

This video illustrates typical pupil responses to a standard TFA stimulus pattern. Note the oscillations of the pupil – the constantly changing pupil diameter. This involuntary response to the TFA stimulus is measured by the device and forms the basis of the TFA test – an objective measure of the patient’s visual field and its defects.