Perimeter and method of controlling perimeter
AssigneeKowa Company, Ltd.
InventorTakuya HARA
Life of this patent
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Abstract
A perimeter according to the invention has fixation state detecting means for detecting a fixation state of an examinee in association with each portion where a stimulus should be presented, and necessity of retest is judged for each stimulus. Even if no good fixation state is detected for some stimulus, it is sufficient to retest the portion where the stimulus was presented. Then, burdens on the examinee or an examiner are lighter and the test time is shorter, and test efficiency is increased thereby.
Claims11
A perimeter for measuring a visual field of an examinee in such a state the examinee fixates a predetermined fixation target, 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;
- and
- 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.
A perimeter for measuring a visual field of an examinee in such a state the examinee fixates a predetermined fixation target, comprising:
- stimulus presentation means for presenting a stimulus having predetermined luminance 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 the fixation state of the examinee in order in association with each portion where stimulus should be presented;
- means for outputting discriminant figure of the fixation state that shows the time series fixation states detected in order by the fixation state detecting means;
- and
- retest designating means for designating a time zone where retest is conducted in the discriminant figure of the fixation state.
A method of controlling a perimeter, comprising:
- a step of presenting a stimulus having predetermined luminance at a plurality of portions where stimulus should be presented in order through stimulus presentation means;
- a step of judging a visual field of an examinee by visual field judging means based upon signals outputted through operation of operation means by the examinee who perceived the presented stimulus and signals from stimulus presentation means;
- a step of detecting a fixation state of the examinee in connection with each portion where the stimulus should be presented in order through fixation state detecting means;
- a step of setting a standard value that is a basis whether a retest of the visual field is necessary or not by standard value setting means;
- and
- a step of judging as to whether a retest is necessary or not to each portion where the stimulus should be presented through retest judging means by comparing each fixation state detected in order through the fixation state detecting means and the standard value that is set through the standard value setting means.
Dependencies are inferred from the claim text.