Abstract
Purpose :
To evaluate the thresholds fluctuation of the Oculus Smartfield perimeter using Spark strategy and the Humphrey Analyzer perimeter using SITA-Fast strategy.
Methods :
The Oculus Smartfield is a prototipe of a compact automated perimeter for static visual field examination which uses a LED’s tangent screen for generating luminous stimuli and a wide diameter lens for near vision compensation. Spark strategy makes four consecutives threshold stimation and the result obtained is a average of them. The Humphrey Analyzer is a proyection commercial perimeter which uses the SITA strategy.
We performed a prospective, observational clinical study to learn about threshold fluctuation differences between Smartfield and Humphrey perimeters. A hundred and five normal eyes and 138 suspect and confirmed glaucomas were examined twice with each system in random order. Fifty two both strategies matching points were analyzed: 30ox24o in Spark (66 points) and 24-2 in SITA-Fast (52 points).
Results :
Exam duration was: 2:57 minutes (sd=0:02) in Spark and 2:56 minutes (sd=0:46) in SITA-Fast (P=0.33). Fluctuation in the matching points were respectively: for thresholds between 20-35dB, 1.09dB (sd=1.16) and 1.36dB (sd=1.77) (p<0.0001) and between 0-20dB: 2.23dB (sd=2.51) and 3.76dB (sd=4.80) (P<0.0001). Bland-Altman diagram showed a similar distribution between both perimeters for small and wide desviations.
Conclusions :
Fluctuation was significantly lower in the averaged Smartfield-Spark strategy than in Humphrey SITA-Fast, mainly below 20 dB, which results inferior in more than 40%. This fact seems not to be related to both instruments and strategies dynamic range differences.
This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.