On global averages of visual field grids with variable test patterns
Turpin, A.; McKendrick, A.
Show abstract
1As all current commercial perimeters use a fixed pattern of locations to test visual fields, computing simple averages of the measured locations to get visual field indices like Mean Defect (MD) and Mean Deviation (MD) can be used to summarise the field and changes in the field. In this short paper we show the modifications required to compute visual field indices if the test pattern changes between visual field tests. We show by taking the average with locations weighted by the area of the field they represent and computing change between two tests only on locations that are common to both tests, MD can be computed for a series of fields that vary their test patterns.
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