Image acquisition equipment applied to corneal topography instrument

Abstract

The invention discloses image acquisition equipment applied to a corneal topography instrument. The image acquisition equipment comprises an equipment shell, an image acquisition system and a three-dimensional moving platform, wherein the equipment shell is provided with a light pass hole; the image acquisition system is positioned in the equipment shell; the three-dimensional moving platform is used for arranging the image acquisition system; the image acquisition system comprises a CCD (Charge Coupled Device) imaging system with a CCD camera, a lens system and an optical projection device; the three-dimensional moving platform is driven through a step motor; and both the step motor and the CCD camera are controlled by an upper computer with an image display device. An optimal position between the image acquisition system and a human eye cornea can be adjusted through an image acquisition software widow of the upper computer. The image acquisition equipment can be used for precisely adjusting the relative position between the image acquisition system and the human eye cornea in place of a hand, and an image of the human eye cornea can be acquired by applying an overlook type positioning and acquisition method in place of the conventional front positioning and acquisition method, so that the image acquisition equipment is easy and convenient to operate and high in accuracy.

Description

technical field [0001] The invention relates to a corneal image acquisition device, in particular to a corneal image acquisition device with an automatic positioning function. Background technique [0002] At present, there are a variety of corneal topographers based on different measurement principles on the market. Commonly used measurement methods include Placido disk method, slit scanning method, three-dimensional triangular grating grid projection method, interferometry and so on. Among them, the corneal topography instrument based on the Placido disc method is the most widely used. The Placido disc is a black and white concentric ring. When using the Placido disc, the examiner observes the image of the concentric rings on the subject's cornea through the small hole in the disc to understand the curvature of the cornea. The normal corneal image should be regular concentric circles, the regular astigmatism is an ellipse of different shapes, and the irregular astigmatism...

AI Technical Summary

Problems solved by technology

[0007] 2. When ophthalmologists or examiners collect corneal images, they need to observe the images on the computer screen to judge whether they are aligned, and adjust the position of the device by hand to align the focus. This design method has poor operability , manual adjustment is not convenient enough

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