In a method of checking the threshold values of a subject's perception of visual stimuli, for each one of a selection of test series, the estimated error of a threshold value estimate of the test series is used to judge whether the test series is to be continued or not. This means that a test series may be discontinued as soon as the threshold value thereof can be determined with acceptable accuracy. Preferably, a posterior probability function is used for estimating the error. An apparatus for carrying out the method includes a control unit operating according to the method.

In a method of testing a subject's perception of successively presented visual stimuli, a predetermined preliminary response time window is used at the beginning of the test to preliminarily classify the visual stimuli as "seen" or "not seen" depending on whether or not a response is received from the subject within the preliminary response time window. To permit reclassification of the visual stimuli at a later stage, the time of reception of every response, whether outside or within the preliminary response time windows, is stored. When an appropriate number of stimuli have been presented, a subject-adapted response time window is determined on the basis of the stored times of reception of the responses. This subject-adapted response time window is used for reclassifying the preliminarily classified stimuli. Moreover, the frequency of false positive responses can be determined on the basis of the number of responses received outside the preliminary response time window and/or the subject-adapted response time window. An apparatus for carrying out the testing includes a control unit operating according to the method.

An automated system and method for determining pupillary threshold response is described. The system achieves the determination of pupillary threshold levels through the measurement of supra-threshold responses at varying light intensities, which measured values are processed by a non-linear regression routine to approximate threshold response. The system takes supra-threshold measurements by means of a computerized pupillometer which is linked to an automated perimeter. The measurements are sequentially taken at varied light intensities which are reiteratively selected in response to the comparison between responses that have been previously measured during the test and a pre-stored response curve of expected values. The measured values are then processed by a non-linear regression routine to indirectly generate an estimated threshold level. The system is fully automated, produces accurate and reliable results, and is not subject to the uncertainties which are attendant with the measurement of threshold levels by the taking of subjective measurements.

A system is provided for measuring the color visual fields of a patient's eyes, and includes a viewing area for the patient to direct one of their eyes toward. The viewing area also has a viewing area perimeter, and the viewing area is divided into four substantially equal quadrants. The system further includes a fixation structure, which is located substantially at a central portion of the viewing area. Generally, the purpose of the fixation structure is to hold the attention of the patient. There are also a plurality of predetermined and substantially linear paths included in the system. The paths extend in directions radially outward from the fixation structure toward the viewing area perimeter. The plurality of predetermined paths are spaced apart by substantially equal angles of separation. Also, each quadrant of the viewing area includes at least two predetermined paths therein. A stimuli target is also provided to continuously and automatically move along the predetermined paths. The stimuli target moves in a direction beginning at a beginning point on the viewing area and continues toward an ending point for each path. The stimuli target completes movement on a first path before beginning movement on a second path.