Patent ID: 7775662
Filing Date: 2010-08-17
Classification: A61B

Abstract:
1. A visual acuity testing apparatus, comprising: a target presenting unit for displaying various targets to be presented to a subject's eye; an optical element arranging device for retaining various optical elements, and selectively arranging the optical element corresponding to a response from the subject between the subject's eye and the target presenting unit; an operation section which is operated for selecting each of targets and each of the optical elements; a display section for displaying an operation image illustrating an operation content of the operation section; a memory for storing a plurality of target data illustrating each of the targets and operation image data illustrating the operation image; an arithmetic control section for extracting the target data and the operation image data from the memory according to an operation of the operation section; and an image output section having at least two output ports, wherein the image output section outputs to the display section via one output port an operation image signal corresponding to the operation images data extracted by the arithmetic control section, and outputs to at least one of the display section, the target presenting unit and an image display device via the other output port a target image signal corresponding to the target data extracted by the arithmetic control section, and wherein the image output section outputs the target image signal to the display section via the other output port, the target selected by the operation of the operation section is displayed on the display section together with the operation image, or the target selected by the operation of the operation section is displayed on the display section to be switchable with the operation image.