# US 2018/0020910 A1 · Visual acuity test device and visual acuity test system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0020910 A1 - Document ID: US20180020910A1 - Status: Published application - Kind: A1 - Application number: 15/547,555 - Filed: 2016-01-22 - Published: 2018-01-25 - Earliest claimed: 2015-02-17 - Assignees: Rohm Co., Ltd. - Applicants: Rohm Co., Ltd. - Inventors: Toshihisa MAEDA; Masahide Tanaka - Web page: https://patentgrep.com/patent/US20180020910A1 ## CPC - A61B 3/028: for testing visual acuity; for determination of refraction, e.g. phoropters - A61B 3/005: {Constructional features of the display} - A61B 5/11: Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb {(A61B5/1038 takes precedence; motion detection to correct for motion artifacts in physiological signals A61B5/721)} - A61B 3/0041: {characterised by display arrangements} - A61B 2562/0219: Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A portable visual acuity examination device comprises a mounting unit that can be mounted in front of eyes either using or not using eyeglasses, a visual target displaying unit that uses an organic EL display panel, a display controlling unit that changes the visual target displayed on the displaying unit, an inputting unit for visual target viewing results, and a transmitting unit for measurement results. The portable visual acuity examination device comprises an optical system that can change the distance at which the visual target virtual image is visible. The portable visual acuity examination device detects whether eyeglasses are used and matches an uncorrected vision acuity examination and a corrected vision acuity examination. The portable visual acuity examination device switches between a C-type visual target and an E-type visual target. With data display, both the right and left display units are enabled. ## Claims ### Claim 1 A portable visual acuity test device comprising: a mount arranged to have the portable visual acuity test device worn in front of an eye; a display which displays a visual target for a visual acuity test; a display controller which switches visual targets displayed on the display; an input unit to which a recognition result of the visual target is inputted; and a transmitter which transmits a measurement result. ### Claim 2 (depends on 1) The portable visual acuity test device of claim 1, wherein the display comprises an organic electroluminescence display panel. ### Claim 3 (depends on 1) The portable visual acuity test device of claim 1, further comprising: an optical system which permits adjustment of a distance at which a virtual image of the visual target is seen. ### Claim 4 (depends on 1) The portable visual acuity test device of claim 1, wherein the mount is arranged to have the portable visual acuity test device worn in front of the eye both in an eyeglasses-worn state and in a naked-eye state. ### Claim 5 (depends on 4) The portable visual acuity test device of claim 4, further comprising: a detector which detects whether or not eyeglasses are worn. ### Claim 6 (depends on 5) The portable visual acuity test device of claim 5, wherein the detector determines a relationship between whether an intended test is a naked-eye visual acuity test or a corrected visual acuity test and whether or not eyeglasses are worn. ### Claim 7 (depends on 1) The portable visual acuity test device of claim 1, wherein the display can switch between a C shape visual target and an E shape visual target. ### Claim 8 (depends on 1) The portable visual acuity test device of claim 1, wherein the display has a right-eye display and a left-eye display, in a visual acuity test, one of the right-eye display and the left-eye display is enabled, and in information display, the right-eye display and the left-eye display are both enabled. ### Claim 9 (depends on 1) The portable visual acuity test device of claim 1, wherein in information display, the display displays in letters enlarged to be larger than a visual target. ### Claim 10 (depends on 1) The portable visual acuity test device of claim 1, wherein the input unit includes an acceleration sensor arranged to detect a head movement, wherein the input unit inputs the recognition result of the visual target om accordance with the head movement detected by the acceleration sensor. ### Claim 11 (depends on 10) The portable visual acuity test device of claim 10, wherein the recognition result of the visual target is determined based on a relationship between a direction of the visual target displayed on the display and a direction of the head movement detected by the acceleration sensor. ### Claim 12 (depends on 10) The portable visual acuity test device of claim 10, wherein inability to recognize is inputted by a predetermined head movement detected by the acceleration sensor. ### Claim 13 (depends on 1) The portable visual acuity test device of claim 1, wherein a plurality of kinds of visual acuity tests are performed automatically. ### Claim 14 A portable visual acuity test device comprising: a mount arranged to have the portable visual acuity test device worn in front of an eye; a display which displays a visual target for a visual acuity test; and an acceleration sensor which detects a head movement to input, a recognition result of the visual target by a head movement detected by the acceleration sensor. ### Claim 15 (depends on 14) The portable visual acuity test device of claim 14, wherein a recognition result of the visual acuity is determined based on a relationship between a direction of a visual target displayed on the display and a direction of the head movement detected by the acceleration sensor. ### Claim 16 (depends on 14) The portable visual acuity test device of claim 14, wherein inability to recognize is inputted by a predetermined head movement detected by the acceleration sensor. ### Claim 17 (depends on 1) A visual acuity test system comprising: a plurality of portable visual acuity test devices as claimed in claim 1; and an administrator which can communicate with the portable visual acuity test devices. ### Claim 18 A portable visual acuity test device comprising: a right-eye display and a left-eye display, wherein in a visual acuity test, one of the right-eye display and the left-eye display is enabled, and in information display, the right-eye display and the left-eye display are both enabled. ### Claim 19 (depends on 18) The portable visual acuity test device of claim 18, wherein in information display, the right-eye display and the left-eye display in letters enlarged to be larger than a visual target. ### Claim 20 (depends on 18) The portable visual acuity test device of claim 18, further comprising: an acceleration sensor which detects a head movement, wherein the information display and display for the visual acuity test are switched by the head movement detected by the acceleration sensor.