Provided is a diopsimeter (2), comprising: a means (19) for setting a measurement coordinate system (CS) for field of view measurement； a means (13) for detecting, on the basis of the set measurement coordinate system (CS), a location (M1) of a subject's blind spot； and a means (19) which is capable of measuring a field of vision of the same subject eye (22a) at a first time and a second time after the first time, with measurement coordinate systems (CSF, CSN) which are respectively set at the first and second times being references. The diopsimeter (2) further comprises: a means (11) for storing in a memory (15) a location (r, θ) of the blind spot which is detected at the first time； a means (16) for detecting, when measuring the field of vision at the second time, a location (r', θ') of the blind spot of the subject eye, and computing a degree of deviation (α) between the location (r, θ) of the blind spot at the first time and the location (r', θ') of the blind spot at the second time； and a means (17) for, on the basis of the degree of deviation (α), carrying out an operation which moves the new measurement coordinate system (CSN) into alignment with the measurement coordinate system (CSF) at the first time. A measurement of the visual field is carried out on the basis of the measurement coordinate system (CSN) which is aligned with the measurement coordinate system (CSF) at the first time.L'invention concerne un diopsimètre (2) qui comporte : un moyen (19) pour régler un système de coordonnées (CS) de mesure pour une mesure de champ de vision ； un moyen (13) pour détecter, sur la base du système de coordonnées (CS) de mesure réglé, l'emplacement (M1) de la tache aveugle d'un sujet ； un moyen (19) pouvant mesurer un champ de vision du même œil (22a) du sujet à un premier instant et à un second instant après le premier instant, avec des systèmes de coordonnées (CSF, CSN) de mesure qui sont respectivement réglés aux premier et second instants comme références. Le d
