Glaucoma follow-up when converting from long to short perimetric threshold tests.

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Abstract
COMPUTERIZED threshold perimeters have served to standardize perimetric testing and to aid in the general availability and adoption of efficacious and efficient techniques. Early automated testing strategies were time-consuming, and tests sometimes lasted more than 20 minutes per eye. Such long examinations resulted in considerable patient fatigue, clinical delays, and sometimes reduced patient compliance. Early efforts at reducing testing time were based on trade-offs between data quality and time expended.1-6 Recently, the SITA (Swedish Interactive Threshold Algorithm) strategies have been reported to reduce testing time without loss of useful diagnostic information,7,8 and these strategies have become available on Humphrey perimeters.