| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a receiver capable of visual acuity measurement of a level exceeding the limit of reduction display of a sign for an inspection due to the original resolution of the receiver. <P>SOLUTION: By making the receiver display the sign for the inspection and gradually reducing the sign for the inspection, the visual acuity of a subject is measured. After the reduction size of the sign for the inspection reaches the display limit of the receiver, the reduction of the size is stopped. Instead, the hues of the inspection sign and the background are brought closer. In such a manner, the inspection sign is gradually made hard to see, and the visual acuity of the subject is measured succeedingly. <P>COPYRIGHT: (C)2007,JPO&INPIT |
