Perimeter

Abstract

In a perimetry to be conducted, designating an inspection region through a region designator, a perimeter is configured to set a required time of the perimetry (upper limit time) through an upper limit condition setter and to determine total number or positions of stimulus presentation spots based upon the upper limit time. In such a configuration, an examinee knows the time to finish the inspection, and is able to highly keep his (her) concentration in comparison with a case where the required time is not known, thereby improving precision of the inspection.

1 .- 8 . (canceled) 
     
     
         9 . A perimeter for conducting a perimetry on an examinee that enables the examinee to better concentrate on the perimetry, the perimeter comprising:
 a region designator that is configured to display designation images, the designation images comprising an image that shows a past perimetry result image or a fundus image, and to designate an inspection region on the designation images, wherein the inspection region is a region which the perimetry is expected;   a region determiner that determines a stimulus presentation region based upon the designated inspection region, wherein the stimulus presentation region is a region in which one or more visual stimuli are presented to the examinee;   an upper limit condition setter that sets an upper limit condition, wherein the upper limit condition is either a total number of stimulus presentation spots in the stimulus presentation region or an upper limit time duration for conducting the perimetry, wherein the stimulus presentation spot is a spot in the stimulus presentation region to which a visual stimulus is presented;   a position determiner that determines a position of each stimulus presentation spot in the stimulus presentation region that enables completing the perimetry under a condition lower than the upper limit condition;   a stimulus presenter that presents the one or more visual stimuli in order with a predetermined brightness to each position determined by the position determiner;   an operation device to be operated by the examinee when the examinee perceives the presented one or more visual stimuli; and   a result judger that judges results of the perimetry based upon signals from the stimulus presenter and the operation device.   
     
     
         10 . The perimeter according to  claim 9 , wherein the stimulus presenter is configured to present each of the visual stimuli to each stimulus presentation spot, gradually changing their brightness twice or more, and the position determiner determines the total number of the stimulus presentation spots and the positions when the upper limit time is set through the upper limit condition setter, and the position of each stimulus presentation spot when the total number of the stimulus presentation spots is set through the upper limit condition setter. 
     
     
         11 . The perimeter according to  claim 9 , wherein the region determiner determines the inspection region as the stimulus presentation region when an occupancy ratio is at a first state,
 wherein the occupancy ratio is the ratio of an area or a length occupied by the inspection region to an area or a length occupied by the designation image,   wherein the first state is when the occupancy ratio is at least a predetermined standard value; and   the region determiner determines both a spaced region and the inspection region as the stimulus presentation region when the occupancy ratio is at a second state,   wherein the spaced region is the regions separated in an up/down direction, in an oblique direction, and in a right/left direction from the inspection region,   wherein the second state is when the occupancy ratio is lower than the predetermined standard value; and   the stimulus presenter is configured to present the visual stimuli in the inspection region when the occupancy ratio is at the first state, and the stimulus presenter is configured to present the visual stimuli in both the spaced region and the inspection region when the occupancy ratio is at the second state.   
     
     
         12 . The perimeter according to  claim 11 , wherein the position determiner determines the stimulus presentation spots such that the total number of the stimulus presentation spots in the inspection region is more than a total number of the stimulus presentation spots in the spaced region when occupancy ratio is at the second state. 
     
     
         13 . The perimeter according to  claim 9 , wherein the region designator is configured to display the past perimetry result image and to designate the inspection region on the past perimetry result image, and the position determiner is configured to determine at least one of the stimulus presentation spots in the past perimetry result image as the stimulus presentation spot for the perimetry. 
     
     
         14 . The perimeter according to  claim 9 , further comprising:
 a state confirmor that confirms a progress state of the perimetry during the perimetry based upon signals from the stimulus presenter and the operation device;   a finish time predictor that predicts whether the perimetry finishes for all the stimulus presentation spots within the upper limit time based upon the progress state confirmed by the state confirmor; and   a stimulus controller that controls the stimulus presenter not to present the visual stimuli to a part of the stimulus presentation spots if the finish time predictor predicts that the perimetry does not finish on all the stimulus presentation spots within the upper limit time.   
     
     
         15 . The perimeter according to  claim 14 , wherein the position determiner is configured to give a priority to each stimulus presentation spot, and the stimulus controller is configured to omit the stimulus presentation to the spot having a lower priority. 
     
     
         16 . The perimeter according to  claim 9 , further comprising:
 a state confirmor that confirms the progress state of the perimetry during the perimetry based upon the signals from the stimulus presenter and the operation device;   a finish time predictor that predicts whether the perimetry finishes within the upper limit time for all stimulus presentation spots based upon the progress state confirmed by the state confirmor; and   a stimulus controller that controls the stimulus presenter not to present the visual stimuli onto a part of the stimulus presentation spots if the finish time predictor predicted that the perimetry does not finish within the upper limit time for all the stimulus presentation spots,   wherein the region determiner determines the inspection region as the stimulus presentation region when an occupancy ratio is at a first state,
 wherein the occupancy ratio is the ratio of an area or a length occupied by the inspection region to an area or a length occupied by the designation image, 
 wherein the first state is when the occupancy ratio is at least a predetermined standard value; and 
   the region determiner determines both a spaced region and the inspection region as the stimulus presentation region when the occupancy ratio is at a second state,
 wherein the spaced region is the regions separated in an up/down direction, in an oblique direction, and in a right/left direction from the inspection region, 
 wherein the second state is when the occupancy ratio is lower than the predetermined standard value; and 
   the stimulus presenter is configured to present the visual stimuli in the inspection region when the occupancy ratio is at the first state, and the stimulus presenter is configured to present the visual stimuli in both the spaced region and the inspection region when the occupancy ratio is at the second state; and   the stimulus controller controls the stimulus presenter not to present the visual stimulus onto a part of the stimulus presentation spots if the finish time predictor predicts that the perimetry does not finish within the upper limit time for all the stimulus presentation spots and the occupancy ratio is in the second state.