A perimeter (1) having a means (26, 27) for measuring the field of vision of a subject eye by successively causing visual recognition of a visual target (16) projected in different areas, a means (18) for monitoring the fixation status during field of vision measurements, an illumination means (20, 21, 22) for providing illumination to a brightness required for monitoring the fixation status of the subject eye, and a vision correcting means (7) for correcting the vision of a subject eye wherein the perimeter is provided with: a lens holder part (12) provided to allow a corrective lens on the vision correcting means (7) to be attached, detached, or replaced a lens brightness database (31) for displaying the brightness of the illumination means when the subject eye (19) is illuminated at essentially the same brightness in accordance with the mode of mounting the corrective lens that is mounted on the lens holder part (12) a means (29) for calculating the state in which the corrective lens is mounted with regard to the vision correcting means (7) a means (29) for calculating the brightness of the illumination means corresponding to the mode of mounting of the corrective lens, based on the lens brightness database (31) and a control means (29) for illuminating the subject eye using the illumination means, based on the calculated brightness of the illumination means.
