Perimeter
AssigneeKowa Company, Ltd.
InventorSatoshi Shimada
Life of this patent
Estimating the term…
Abstract
It is easy to perceive a stimulus in a central portion of a visual field rather than in a peripheral portion thereof, and it is easy to perceive the stimulus for a younger examinee rather than for an older examinee even if the stimulus having the same luminance is indicated. In the perimeter according to the invention, the stimuli are indicated at various positions of a visual field dome, and the luminance of the stimulus is gradually raised before obtaining a response from an examinee through an operation switch. A value of the luminance of the indicated stimulus is set according to the position of the indicated stimulus and an age of the examinee, and the measurement accuracy is correct, thereby.
Claims6
Perimeter for visual field contraction by successively presenting stimuli at various positions in said visual field, comprising:
- a stimulus presentation unit for presenting said stimuli while gradually changing a luminance, said stimulus presentation unit having indicated position regulating means for regulating a position of said stimulus to be indicated, and indicated luminance regulating means for regulating said luminance of said stimulus to be indicated;
- operation means for inputting whether or not an examinee can perceive said stimulus;
- and
- said indicated luminance regulating means having a standard luminance storing portion for storing a standard luminance every position of said stimulus to be indicated, a deviation storing portion for storing a deviation every position of said stimulus to be indicated, and a luminance control portion for gradually changing said luminance of said stimulus to be indicated on the basis of standard luminance data from said standard luminance storing portion and deviation data from said deviation storing portion.
Dependencies are inferred from the claim text.