Portable corneal topographer

Abstract

The invention relates to the technical field of ophthalmic image processing, and provides a portable corneal topographer. The portable corneal topographer comprises a light source component, a spectroscope, a modulation reticle and a lens group, wherein the spectroscope is provided with a semi-reflecting and semi-transmitting optical surface; the modulation reticle is arranged between the light emitting surface of the light source component and the spectroscope, and is distributed on a first incident light path of the optical surface; the modulation reticle is distributed in a manner of keeping away from a second incident light path of the optical surface; and the lens group is distributed on a transmission light path of the optical surface of the spectroscope. The spectroscope is arrangedto receive ring light, reflect and irradiate the ring light on the cornea, receive reflected light reflected by the cornea and transmit and irradiate the reflected light on the lens group, and the modulation reticle does not need to be provided with an avoiding inner hole for the reflected light reflected by the cornea to pass through, so that the radial size of the modulation reticle can be setto be small, the thickness of the corneal topographer is reduced, and the overall structure is simple in arrangement and relatively small in size.

Description

technical field [0001] The invention relates to the technical field of ophthalmic image processing, in particular to a portable corneal topography instrument. Background technique [0002] The cornea is the most important optical surface of the human eye. The curvature of the cornea and any changes on the surface of the cornea will change the total refractive power of the eyeball or the quality of retinal imaging. Therefore, the measurement and analysis of the cornea and corneal morphology has become an important part of eye refractive optics research and clinical research. The important part of corneal topographer is currently on the market with a variety of corneal topography products based on different measurement principles. The commonly used measurement methods include Placido disc 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 me...

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the corneal topographer in the prior art. Since the inner hole of the Placido disc needs to reflect the overall light of the virtual image formed on the human cornea to the lens system, along the Placido disc The radial direction of the Placido disc needs to be made larger, resulting in a larger overall volume of the corneal topographer, which is inconvenient to use or move, so as to provide a corneal topographer with a small volume and easy to use

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