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Glaucoma progression detection with frequency doubling technology ( FDT ) compared to standard automated perimetry ( SAP ) in the Groningen Longitudinal Glaucoma Study
Author(s) -
Wesselink Christiaan,
Jansonius Nomdo M.
Publication year - 2017
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/opo.12401
Subject(s) - glaucoma , interquartile range , ophthalmology , medicine , absolute deviation , standard deviation , linear regression , mathematics , surgery , statistics
Purpose To determine the usefulness of frequency doubling perimetry (FDT) for progression detection in glaucoma, compared to standard automated perimetry (SAP). Methods Data were used from 150 eyes of 150 glaucoma patients from the Groningen Longitudinal Glaucoma Study. After baseline, SAP was performed approximately yearly; FDT every other year. First and last visit had to contain both tests. Using linear regression, progression velocities were calculated for SAP (Humphrey Field Analyzer) mean deviation (MD) and FDT MD and the number of test locations with a total deviation probability below p < 0.01 (TD). Progression velocity tertiles were determined and eyes were classified as slowly, intermediately, or fast progressing for both techniques. Comparison between SAP and FDT classifications were made using a Mantel Haenszel chi‐square test. Longitudinal signal‐to‐noise ratios (LSNRs) were calculated, per patient and per technique, defined as progression velocity divided by the standard deviation of the residuals. Results Mean (SD) follow‐up was 6.4 (1.7) years; median (interquartile range [IQR]) baseline SAP MD −6.6 (−14.2 to −3.6) dB. On average 8.2 and 4.5 tests were performed for SAP and FDT, respectively. Median (IQR) MD slope was −0.16 (−0.46 to +0.02) dB/year for SAP and −0.05 (−0.39 to +0.17) dB/year for FDT. Mantel Haenszel chi‐squares of SAP MD vs FDT MD and TD were 12.5 ( p < 0.001) and 15.8 ( p < 0.001), respectively. LSNRs for SAP MD (median −0.17 yr −1 ) were better than those for FDT MD (−0.04 yr −1 ; p = 0.010). Conclusions FDT may be a useful technique for monitoring glaucoma progression in patients who cannot perform SAP reliably.