TFA Technology

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.

Get the latest Flash Player to see this player.

*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.

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.

Get the latest Flash Player to see this player.