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Visual fields are one of the primary diagnostic imaging tests used to assess glaucoma and other optic neuropathies. The DICOM Ophthalmic Visual Field (OPV) file format is the gold-standard for saving and communicating visual field results. Table 2. Examples of visual field devices, testing strategies, patterns, and reported metrics.
Visual field index (VFI). This index expresses the visual field status as a percent of a normal age-adjusted visual field. Greater weight is given to points closer to fixation to adjust for gangion cell density and visual function. The index may also be less sensitive to cataract and media changes. Mean deviation (see section 4.3). The overall ...
15 cze 2020 · Look for a cluster of two or more defects, and look at the summary data, including mean deviation, pattern standard deviation, visual field index (VFI) and the glaucoma hemifield test. (EyeWiki does a great job of simplifying this.)
Look at the GHT, mean deviation, VFI, and pattern standard deviation; Compare to the previous visual fields
“The VFI is a new global metric that represents the entire visual field as a single percentage of normal,” said Richard Madonna, O.D., SUNY State College of Optometry, New York. “It is based largely on the pattern deviation and weighs central points more than peripheral ones.”
Two major approaches to evaluating the progression of visual field defects have been employed. Event-based change analysis asks the question, “Has existing glaucoma progressed?” by comparing a visual field result to a prior or baseline visual field. Trend-based analysis looks for the rate of change in the visual field over time.
29 paź 2016 · Some novel ideas about improving visual field (VF) testing are emerging in the glaucoma research community, and even though more work is needed, they are inspiring new ways of thinking. “The more damage you have, the more variable the data get.
