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Panasonic : Patent Issued for Visual Function Testing Device

07/01/2015 | 04:59pm US/Eastern

By a News Reporter-Staff News Editor at China Weekly News -- PANASONIC CORPORATION (Osaka, JP) has been issued patent number 9060693, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventor is Kawamura, Ryo (Osaka, JP).

This patent was filed on January 6, 2014 and was published online on June 23, 2015.

From the background information supplied by the inventors, news correspondents obtained the following quote: "Heretofore, visual function testing devices for testing a variety of visual functions have been known. In visual function tests in the ophthalmic treatment, there are many test items. As the test items concerned, there are visual acuity and field tests, a binocular vision test, an eye position test, and the like. The visual function testing devices for the variety of visual function tests as described above are configured according to specifications specialized for test contents of the respective items such as the visual acuity and the visual field, and accordingly, there is not a visual function testing device capable of testing the visual acuity, the visual field and the binocular vision by itself.

"As the visual function testing devices, there are known visual function testing devices, each of which is capable of performing two items of the visual function tests as described in Patent Literature 1 and Patent Literature 2, which are described below.

"The visual function testing device described in Patent Literature 1 (Japanese Patent No. 3168056) has a function to present visual targets individually to left and right eyes by a dichoptic method using an optical system, a polarization filter, and a red/green filter, and in the same tester, uses such a visual target for the visual acuity test and such a visual target for the binocular vision test. In such a way, the visual function testing device of Patent Literature 1 can perform two visual function tests, which are the visual acuity test and the binocular vision test, by itself.

"The visual function testing device described in Patent Literature 2 (Japanese Patent Laid-Open Publication No. 2003-93344) is a device configured in such a manner that a liquid crystal display for the visual acuity test is arranged on a center thereof, and that a light source for the visual field test, which is composed of a large number of LEDs, is arranged on a periphery of the liquid crystal display. In such a way, the visual function testing device of Patent Literature 2 can perform two visual function tests, which are the visual acuity test and the visual field test."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventor's summary information for this patent: "Technical Problem

"However, with regard to the visual function testers using the above-mentioned technology, there are instruments individually dedicated for the test items, and there is not a visual function testing device capable of testing more than two visual functions such as the visual acuity, the visual field, stereopsis, the binocular vision and the eye position.

"Moreover, in the current visual acuity tester and visual field tester, a visual field of one eye is blocked by using an occluder and the like, and the tests are performed for each eye.

"Moreover, since the current binocular vision tester realizes dichoptic viewing by means of a structure of looking into a lens barrel, the visual field is restricted, and accordingly, is narrowed. As described above, the current visual function testers block the visual field by the occluder and restrict the visual field by the lens barrel, and thereby implement the visual function tests in a state where visual performance is different from a daily one.

"It is one of the objectives of the present disclosure to provide a visual function testing device for performing the plurality of visual function tests by itself in a state where both eyes are opened and a state where visual performance is close to the daily one without restricting the visual field.

"Solution to Problem

"A visual function testing device according to a first example of the present disclosure is a visual function testing device for testing a plurality of visual functions. The visual function testing device includes a visual target image presenting unit for presenting a visual target image; a visual target image rendering unit for rendering the visual target image to be presented on the visual target image presenting unit; a visual function test item selecting unit for selecting an item of a visual function test; a visual target image generating unit for generating a visual target image corresponding to the item of the test, the item being selected by the visual function test item selecting unit; a viewpoint distance inputting unit for inputting a distance between the visual target image presenting unit and a viewpoint of an observer; and a visual angle inputting unit for inputting an angle to be made by the visual target image and the viewpoint of the observer. Based on a viewpoint distance inputted by the viewpoint distance inputting unit and on the visual angle inputted by the visual angle inputting unit, the visual target image rendering unit calculates a display size and display position of a visual target image corresponding to a visual acuity or visual field test selected by the visual function test item selecting unit, and renders the visual target image with the calculated display size at the calculated display position.

"In a second example of the present disclosure as the visual function testing device according to the first example, the visual target image generating unit has a binocular visual target image generation function to generate visual target images for each of a right eye and left eye of a subject, the visual target image presenting unit presents dichoptic visual target images for the right and the left eye, respectively, the dichoptic visual target images being separated for the right eye and the left eye from the binocular visual target images generated by the visual target image generating unit, the visual function testing device further includes a visual target image selection presenting unit configured to select display or non-display of a right visual target image for the right eye or a left visual target image for the left eye independently with each other, the right and left visual target images being to be presented by the visual target image presenting unit, and the visual target image selection presenting unit displays a visual target image corresponding to the stereopsis test selected by the visual function test item selecting unit.

"A third example of the present disclosure as the visual function testing device according to the second example further includes a visual target image operating unit for changing at least one of the display size or display position of the visual target image by an operation of a user. In a case where a binocular vision test or an eye position test is selected by the visual function test item selecting unit, the visual target image rendering unit changes the visual target image to the display size and the display position, which are calculated by the visual target image rendering unit, in accordance with the display size or the display position of the visual target image changed by the visual target image operating unit.

"In a fourth example of the present disclosure as the visual function testing device according to any one of the first to third examples, the visual target image rendering unit has a visual target image adjusting unit for adjusting brightness, contrast, color and transparency of the visual target image.

"A fifth example of the present disclosure as the visual function testing device according to any one of the first to fourth examples further includes: a viewing angle inputting unit for inputting a viewing angle for use in the visual field test in a case where the visual field test is selected by the visual function test item selecting unit; and a viewpoint distance calculating unit for calculating a viewpoint distance to be required for implementing the visual field test at the viewing angle inputted by the viewing angle inputting unit in a screen dimension of the visual target image presenting unit.

"A sixth example of the present disclosure as the visual function testing device according to any one of the first to fifth examples further includes: a visual acuity inputting unit for inputting visual acuity for use in the visual acuity test in a case where the visual acuity test is selected by the visual function test item selecting unit; and a viewpoint distance calculating unit for calculating a viewpoint distance to be required for implementing the visual acuity test at the visual acuity inputted by the visual acuity inputting unit in a resolution of the visual target image presenting unit.

"A seventh example of the present disclosure as the visual function testing device according to any one of the second to sixth examples further includes: a parallax inputting unit for inputting a parallax for use in the stereopsis test in a case where the stereopsis test is selected by the visual function test item selecting unit; and a viewpoint distance calculating unit for calculating a viewpoint distance to be required for implementing the stereopsis test at the parallax inputted by the parallax inputting unit in the resolution of the visual target image presenting unit.

"An eighth example of the present disclosure as the visual function testing device according to any one of the first to seventh examples further includes: a viewpoint distance measuring unit for measuring a distance between the visual target image presenting unit and the viewpoint of the observer. The measured viewpoint distance is inputted to the viewpoint distance inputting unit.

"A ninth example of the present disclosure as the visual function testing device according to any one of the second to eighth examples further includes: a visual target image storing unit for storing the visual target image generated by the visual target image generating unit; a display setting storing unit for storing the display size and the display position of the visual target image, which are calculated by using the viewpoint position inputted by the viewpoint distance inputting unit and using visual angle inputted by the visual angle inputting unit; a visual target image selection storing unit for storing the display or non-display of the visual target image for each of the right eye and the left eye, the display or the non-display being set by the visual target image selection presenting unit; and a display order setting unit for setting a display order of a plurality of the visual target images by using in combination plural pieces of information stored in the respective storing unit, the visual target images being stored in the visual target image storing unit. In accordance with the display order set by the display order setting unit, the visual target images stored in the visual target image storing unit are called out, and are rendered by the visual target image rendering unit.

"A tenth example of the present disclosure as the visual function testing device according to any one of the first to ninth examples further includes: an output unit for outputting test results of the visual function tests selected by the visual function test item selecting unit. The test results corresponding to the respective test items are outputted in a predetermined format.

"Advantageous Effects

"In accordance with the present technologies disclosed herein, the display size and the display position of the visual target image are calculated based on the inputted viewpoint distance and visual angle, and the visual target image is rendered. Accordingly, without blocking the visual field or restricting the viewing field, the plurality of visual function tests can be performed by the same device in a state where both eyes are opened and a state where the visual performance is close to the daily one in which the viewing field is not restricted."

For the URL and additional information on this patent, see: Kawamura, Ryo. Visual Function Testing Device. U.S. Patent Number 9060693, filed January 6, 2014, and published online on June 23, 2015. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=9060693.PN.&OS=PN/9060693RS=PN/9060693

Keywords for this news article include: Asia, Japan, PANASONIC CORPORATION.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2015, NewsRx LLC

(c) 2015 NewsRx LLC, source Geographic Newsletters

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