Measurement errors, correction errors, head position errors, changes in strategy, fluctuations. There are many parameters influencing the results of visual field measurement. When in doubt, it is indispensable to repeat the examination before concluding that the results have deteriorated. In addition to the qualitative assessment, the analysis of global indices can pinpoint the degree of visual field deterioration.

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http://dx.doi.org/10.1016/s0181-5512(04)96203-1DOI Listing

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