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    • 2. 发明授权
    • Corneal topographer with central and peripheral measurement capability
    • 具有中央和外围测量能力的角膜地形图
    • US06116738A
    • 2000-09-12
    • US2549
    • 1998-01-02
    • Dale A. Rorabaugh
    • Dale A. Rorabaugh
    • A61B3/107A61B3/15A61B3/00
    • A61B3/107A61B3/154
    • A videokeratograph has a placido disc with rings concentric about a central axis, a center positioned on the central axis, and an observation opening at the center. A plurality of fixation points are positioned in the placido disc spaced from the center opening and distributed circumferentially around the central axis, whereby rings on the placido disc spaced from the center are reflected from the central zone of the cornea. A video camera positioned on the center axis behind the placido disc observes an image of the placido disc reflected from the cornea. A processor coupled to the video camera determines the shape of the central zone of the cornea.
    • 视频打印机具有一个具有环绕中心轴线同心的环形光栅盘,位于中心轴线上的中心和位于中心的观察开口。 多个固定点定位在与中心开口间隔开并且围绕中心轴线周向分布的平行盘中,由此与中心间隔开的平行盘上的环从角膜的中心区域反射。 位于平盘后面的中心轴上的摄像机观察从角膜反射的平滑盘的图像。 耦合到摄像机的处理器确定角膜中心区域的形状。
    • 3. 发明授权
    • Distance optimizing apparatus for a placido-based eye observation system
    • 用于基于普拉奇视觉观察系统的距离优化装置
    • US6048065A
    • 2000-04-11
    • US154603
    • 1998-09-16
    • Neil M. DavisVincent F. BrancaccioDale A. Rorabaugh
    • Neil M. DavisVincent F. BrancaccioDale A. Rorabaugh
    • A61B3/107A61B3/10
    • A61B3/107
    • An apparatus assists a user of a placido-based eye observation system to place the placido at an optimum distance from an observed eye. A light source is configured as a point source. The light source and a CCD camera are attached to the placido at opposed locations that are spaced from the viewing axis, but symmetric with respect to it. Light is emitted by the source towards the eye, and reflected by the apex of the cornea of the eye on the main axis. The reflected source light appears in the field of view of the CCD camera as a bright point image. The location of the point image within the field of view informs how far away the eye is from the placido. The placido is moved until the point image is positioned within the field of view at a reference position. In a manual embodiment a screen shows what is in the field of view, and an operator looks at the screen and uses a joystick to control movement of the placido. In an automated embodiment a computer analyzes the field of view, determines the position of the point image, and drives a closed loop system to maintain the distance at the optimum value.
    • 一种装置帮助基于placido的眼睛观察系统的使用者将placido放置在距观察眼睛最佳距离处。 光源被配置为点源。 光源和CCD照相机在与观察轴线间隔开但相对于对称的相对位置处附接到平铺。 光源由光源向眼睛发射,并由主轴上眼睛角膜的顶点反射。 反射光源作为亮点图像出现在CCD摄像机的视场中。 点图像在视场内的位置告知眼睛距离平铺点有多远。 移动平面图直到点图像位于参考位置的视场内。 在手动实施例中,屏幕显示在视野中是什么,并且操作者观察屏幕并使用操纵杆来控制平铺的移动。 在自动化实施例中,计算机分析视野,确定点图像的位置,并驱动闭环系统将距离保持在最佳值。
    • 8. 发明授权
    • Automated ocular perimetry, particularly kinetic perimetry
    • 自动眼视野,特别是动态视野
    • US5035500A
    • 1991-07-30
    • US503116
    • 1990-03-26
    • Dale A. RorabaughNeil DavisGeorge A. Mansfield, Jr.Vince Brancaccio
    • Dale A. RorabaughNeil DavisGeorge A. Mansfield, Jr.Vince Brancaccio
    • A61B3/024G06F19/00
    • A61B3/024
    • A first light is moved and illuminated by an x-y plotter mechanism on a rear projection screen under computer control so as to be continuously fixated by an eye of a test subject. The computer also causes one or ones of fixed-position second lights, typically sixteen in number positioned in a regular array, to momentarily illuminate at various times corresponding to various positions of the moving first light. The test subject indicates detection or non-detection of the momentary illuminations to the computer by voicing the numbers "1", "2", "3", etc. From successive illuminations and test subject responses the computer is able to survey the entire visual field of each subject's eye in all directions. The surveyed visual field is plotted on graph paper with the same x-y plotter mechanism that is otherwise and at other times used for moving the first light source.
    • 在计算机控制下,第一个光由x-y绘图仪机构在背投屏幕上移动和照亮,以便被测试者的眼睛连续固定。 计算机还使得定位在规则阵列中的固定位置第二光(通常为十六个)中的一个或一个在对应于移动的第一光的各个位置的各种时刻瞬间照亮。 测试对象表示通过发出数字“1”,“2”,“3”等对计算机的瞬间照明的检测或不检测。从连续的照明和测试对象的响应,计算机能够对整个视觉进行测量 每个受试者的眼睛在各个方向的领域。 所测量的视野绘制在图纸上,并具有相同的x-y绘图机制,否则和其他时候用于移动第一光源。