Effect of number of test points in automated perimetry

We studied sensitivity variation in normal subjects by changing the number of test locations under the fixed test field on automated perimetry. Using the user-defined program (Sargon), we designed five different programs that varied in the number of test points. Mean sensitivity and short-term fluctuations were obtained from the same test points of each program. The mean sensitivity within 10 degrees decreased with the increasing number of test points, whereas the short-term fluctuation increased with the increasing number of test points. Our results showed that the number of test points had an important role in measuring sensitivity and its reproducibility on automated perimetry.