Patent ID: 8727535

Claim:
A perimeter for measuring a visual field of an examinee in such a state the examinee fixates a predetermined fixation target, the perimeter comprising: stimulus presentation means for presenting a stimulus having predetermined luminance in order at a plurality of portions where stimulus should be presented; operation means to be operated by the examinee who perceived the presented stimulus; visual field judging means for judging the visual field of the examinee based upon signals from the stimulus presentation means and the operation means; fixation state detecting means for detecting fixation state of the examinee in order in association with each portion where the stimulus should be presented; standard value setting means for setting a standard value which is a basis as to whether retest of the visual field is necessary or not in the fixation state; retest judging means for judging as to whether retest is necessary or not for each portion where the stimulus should be presented by comparing each fixation state detected by the fixation state detecting means in order and the standard value set by the standard value setting means; and retest execution means for conducting a retest of the visual field in such a way that the stimulus presentation means is controlled to present the stimulus again to the portion where the stimulus should be presented that was judged to be necessary to be retested through the retest judging means, and the visual field judging means judges the visual field of the examinee based upon signals from the stimulus presentation means and the operation means.