A Simple Routine for Demonstrating Increased Threshold Scatter by Comparing Stored Computer Fields

Abstract

It has previously been shown that before a glaucomatous visual field defect can be clearly demonstrated, the same area often shows increased variation at repeated threshold determinations. Computerized perimeters with the capability of storing visual fields can easily be programmed to compare and analyze consecutive fields from the same eye in various ways. By using a programme where the range and standard deviation of threshold values measured at consecutive examinations are printed out for all test points, areas with increased scatter can be easily identified. In early glaucoma these types of printouts may demonstrate problem areas before clearcut visual field defects are obvious.