Flicker Fusion System

The Lafayette Instrument Flicker Fusion system provides the user with a variety of versatile controls to perform accurate and timely measurements of CFF. Digital circuitry is used to provide extremely accurate frequency generation from 1.0 Hz to 100.0 Hz in 0.1 Hz steps. Unlike previous systems, this generation uses a Bluetooth® connection for maximum convenience. The tablet allows for exact and repeatable frequency settings, and a means for test result scoring and storage.

The test options include five modes of operation to cover virtually any test requirement:

• Simple Flicker: Stimulus is decreased from steady to the point at which the light changes from steady to flicker.
• Simple Fusion: Stimulus is increased from flicker to the point at which the light changes from flicker to steady.
• Automatic: Automatically runs test using the Simple Fusion test to determine the fusion frequency and the Simple Flicker test to determine the flicker frequency.
• Adaptive: Displays fixed frequencies and allows the test subject to respond to the frequencies as Flicker or Fusion. This test zeros in on the CFF and automatically ends when the value is determined.
• Self-Control: Allows the test subject to select whether to increase or decrease the frequency. This test is ended by the subject.

The viewing chamber has two lights, one for the left eye and one for the right eye. The light compartments are completely separated, allowing for four stimulus combinations to occur:

• Left: Left eye only
• Right: Right eye only
• Coincident: Left and right simultaneously
• Alternate: Left and right alternately

The viewing chamber is constructed to mitigate extraneous factors, which might distort CFF values. The white lamps produce even illumination over a 1 inch square LED. The stimuli are separated by 2 3/4 inches center to center with a stimulus to eye distance of 15 inches and a viewing angle of 1.9 degrees.

Includes

• Tablet
• Viewing Chamber
• AC adapter
• Hand-held response switch

Note: The Flicker Fusion System is not a medical device and should only be used for research or other scientific purposes.