Patent ID: 8602559

Claim:
A perimeter having: a visual field measurer that measures a visual field of an eye to be examined when the eye to be examined perceives stimuli projected in order at different positions on a visual field dome: a fixation state monitor that monitors a fixation state of the eye to be examined at a time of perimetry; said fixation state monitor having two or more illuminators that light the eye to be examined at a brightness necessary for monitoring the fixation state of the eye to be examined; and a visibility corrector that corrects visibility of the eye to be examined; said perimeter further comprising: said visibility corrector having a stem being provided so as to set a starting position, return, rotate and move with a rotation axis that is located on an outside of said opening of said visual field dome as its center, and a lens holder portion being provided at a top end of the stem so as to be freely positioned between a set position of a center portion of said opening and a stored position provided at an outside of said opening in such a state that the stem and the lens holder portion are not watched from the opening by setting, returning rotating and moving of the stem; a position detector that detects whether said visibility corrector is positioned at said set position or said stored position; an illumination controller that respectively drives said two or more illuminators according to a position of said visibility corrector detected by said position detector.