Humphrey FDT The Humphrey® FDT Visual Field Instrument with patented Welch Allyn frequency doubling technology provides the eyecare professional with a rapid, clinically verified and affordable method for the detection of visual field loss. With minimal set-up time and test times as low as 45 seconds, the Humphrey FDT is fast enough to screen all of your patients. For positive screening results, threshold tests provide additional diagnostic information. The 19-pound tabletop Humphrey FDT is portable, easy to operate, and can be used in normal lighting conditions and without trial lens correction. The Humphrey FDT is an excellent choice for building your practice.
