Establishing the threshold prior to single and multiple stimulus supra-threshold strategies

The purpose of this study was to establish whether the routines used to establish the threshold at the beginning of single and multiple stimulus supra-threshold strategies yield the same values and whether data from one strategy can, therefore, be compared with those from the other without having to compensate for a difference in test intensities. Single stimulus and multiple stimulus supra-threshold strategies were conducted on 79 subjects using a Henson 4000 perimeter. On average the multiple stimulus strategy gave a value 0.095 dB higher than the single stimulus strategy. The differences between the two strategies was so small that results from the two strategies can be compared without having to compensate for any changes in the supra-threshold test intensity. © 1995.