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The visual field index (VFI) is a global metric that represents the entire visual field as a percentage of normal. It can be used to detect and measure the rate of glaucomatous progression over time, and it correlates with other visual field indices and structural changes.
Purpose: Visual field index (VFI) is a recently introduced summary parameter. Before it is widely adapted, it needs to be further characterized and compared with familiar indices used in glaucoma management, specifically mean deviation (MD).
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 · The EyeRounds article “Visual Field Testing: From One Medical Student to Another” has a helpful diagram and explanation of reliability indices, deviation maps and summary outputs. Always interpret VFs systematically to avoid oversight of clinical importance.
3 cze 2021 · One way to monitor progressive visual field loss is the visual field index. The VFI is more sensitive to changes in the central vision correlating with ganglion cell loss. The index represents the total amount of field loss in a percentage, with 100% meaning a completely normal field and 0% meaning perimetrically blind.
Methods: We developed a new visual field index, the glaucoma progression index (GPI), intended to be less affected by cataract than the MDI by calculating age-corrected defect depth at test points identified as significantly depressed in pattern deviation probability maps.
18 maj 2016 · The visual field index (VFI) is a new global metric that represents the entire visual field as a single number. It is estimated by calculating age corrected defect depth at the test points identified as significantly depressed in pattern deviation probability maps.
