Portable corneal topography acquisition system

Abstract

The invention relates to a handheld acquisition system for recording cornea information. The handheld acquisition system comprises a projection part (101), a camera lens (103), a camera (104) and an image analysis system (105), wherein the projection part (101) consists of LED backlight sources (111) and a Placido disk; the inner surface of the Placido disk adopts concentric circular rings which are uniformly chequered with black and white; and light rays emitted by the LED backlight sources (111) are blocked by black parts in the rings and penetrate through the white part in the rings to be transmitted to a cornea (112) to be tested, the inner part of the Placido disk adopts a rotational symmetry discretionary face type, the opening part facing the cornea (112) to be tested, of the Placido disk is extended as far as possible to be convenient for processing of the inner part of the Placido disk, and the rays reflected from the cornea (112) to be tested are imaged through the camera lens (104). The acquisition system is adopted, so that good view fields and image quality can be obtained, and shape changing rule of the shape of the cornea can be conveniently obtained. 本发明涉及一种手持记录角膜信息的采集系统，包括投影部分(101)，镜头组(103)，相机(104)和图像分析系统(105)，其中所述投影部分(101)由LED背光源(111)和Placido盘组成，其中所述Placido盘的内表面为均匀的黑白相间的同心圆环，所述LED背光源(111)发出的光线被圆环中黑色部分挡住并透过圆环中的白色部分透射到被测角膜(112)，并且所述Placido盘的内部采用旋转对称任意面型，其中所述Placido盘朝向被测角膜(112)的开口部分被尽量扩大以方便加工所述的Placido盘的内部，从被测角膜(112)反射出的光线通过所述镜头组(104)成像。采用本发明的采集系统，具有更好的视野和图像质量，并方便获得角膜形状的形状变化规律。