Visual-field testing专利检索-双目视觉显示技术专利检索查询-专利查询网

Visual-field testing

阅读：53发布：2022-07-14

专利汇可以提供Visual-field testing专利检索，专利查询，专利分析的服务。并且Visual-field testing is effected in a binocular manner by use of a polarized fixation target representation and a non-polarized movable target representation viewed through eye pieces incorporating prismatic means to induce double vision and, in one eye piece, a perpendicularly orientated polarizing filter. Thus a single fixation target representation and two moving target representations are normally seen, but one of the latter disappears in a pathologically blind area for either eye. The separation of the moving target representations is preferably varied together with the spacing between the two targets. Also it is advantageous to employ a triangular arrangement with the screen in one side, the eye pieces in another, and a mirror in the third side, so that the screen is viewed by reflection from the mirror.，下面是Visual-field testing专利的具体信息内容。

权利要求

1. A method of visual-field testing which comprises: presenting a first representation of a stationary fixation target to one eye of a patient; and, while maintaining such presentation, simultaneously presenting to respective ones of both eyes of the patient two mutually separated second representations of a movable target in an intermittent manner and in varying positions within the visual field determined by said first representation.

2. A method according to claim 1 which comprises varying the separation between said second representations to increase and decrease with the spacing of such representations from said first representation.

3. Visual-field testing apparatus comprising: a screen; a first, fixation target mounted in stationary relationship adjacent said screen; first polarising means located intermediate said fixation target and said screen; a second target mounted in movable relationship adjacent said screen; binocular eye pieces through which a patient views said screen; second polarising means incorporated in one of said eye pieces, such means being orientated perpendicularly to said first such means whereby a first representation of said first target is viewed only through the other one of said eye pieces; and prismatic means incorporated in said eye pieces to effect separation of the respective second representations of said second target as viewed through said eye pieces.

4. Apparatus according to claim 3 wherein said prismatic means are of adjustable power, and such means are connected for adjustment with movement of said second target to increase and decrease the prismatic deviation between said second representations with the spacing of said second target from said first target.

5. Apparatus according to claim 4 wherein separate parts of said prismatic means of respectively different power are individually incorporated in said eye pieces.

6. Apparatus according to claim 5 wherein said separate parts each comprise a Risley prism, and such prisms differ in minimum power by about 4 Dioptres.

7. Apparatus according to claim 3 wherein said first polarising means comprises two mutually perpendicularly orientated filters, alternatively locatable intermediate said first target and said screen, said second polarising means comprises a filter orientated parallel to one of said two filters, and said other eye piece incorporates a polarising filter orientated perpendicularly to one of said two filters.

8. Apparatus according to claim 3 comprising a hollowed housing with three walls defining a generally triangular cross-sectional shape, one of said walls including said screen, another of said walls including said eye pieces, and the remaining one of said walls including a mirror, whereby said screen is viewed through said eye pieces by reflection from said mirror.

9. Apparatus according to claim 3 comprising means to alternatively occlude one of said eye pieces.

10. Apparatus according to claim 4 wherein said adjustment connection is disconnectable.

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