#DECIBEL SCALE HUMPHREY VISUAL FILED PLUS#

Henson and his team have estimated that sequentially performing 10-2 and 24-2 testing might take as much as 35 minutes for both eyes. But doing so would extend testing time and make it impractical for clinical use-Prof. 5 Intuitively, the easiest solution would be to add more locations in the crucial central 10°. There is growing evidence that 24-2 perimetry testing, the most commonly performed perimetry test in clinical practice, is inadequately sensitive to early glaucomatous loss in the central 10°, with studies suggesting it appears normal in about 16% of eyes with central loss. Henson, PhD, Emeritus Professor of Ophthalmology & Vision Science at Manchester University in the United Kingdom and inventor of Smart Supra test. Shorter test times can improve the validity of the results, according to David B.

#DECIBEL SCALE HUMPHREY VISUAL FILED PLUS#

Because extra testing is added on an as-needed basis, building upon the initial screening phase without repeating any previously presented stimuli, the 86-point 24-2 plus 10-2 can be completed in around 3.5 minutes. If any stimulus is missed by the patient, the test is extended to include a complete 24-2 assessment (with 54 points of measurement) or a combined 24-2 plus 10-2 visual field assessment (with 86 points). In either case, the location of the stimuli is based on data from nearly 5,000 eyes with early VF loss, and the test has been validated to have over 90% sensitivity for detecting early loss. It can be performed using a single stimulus mode, in which a patient presses a button when they see a stimulus, or a multiple stimulus version, where the patient verbally reports the number of stimuli seen. Solving these inherent limitations will require a rethink of the way we undertake VF testing.Ī testing algorithm known as Smart Supra, available on the Henson 9000 perimeter (Topcon Healthcare), uses a uniquely designed, stepwise protocol that begins as a 26-point rapid screening test that is conducted in less than a minute. Visual field (VF) testing with standard automated perimetry (SAP) is plagued by three fundamental problems: High variability at moderate to severely damaged test locations (<20 dB), 1,2 poor sensitivity to small central defects when testing with the 24-2 test pattern, 3 and long test times.

Decibel scale humphrey visual filed