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Imaging corneal curvimeter optical system

An optical system and imaging system technology, applied in medical science, eye testing equipment, diagnosis, etc., can solve the problem that the measurement accuracy cannot meet the accuracy requirements, meet the image plane resolution requirements, avoid eye shaking, and avoid subjective errors Effect

Inactive Publication Date: 2014-05-07
NANKAI UNIV
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  • Abstract
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Problems solved by technology

However, the measurement accuracy of the above various existing methods still cannot meet the accuracy requirements for guiding the wearing of contact lenses, corneal refractive surgery, and intraocular lens implantation.

Method used

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  • Imaging corneal curvimeter optical system
  • Imaging corneal curvimeter optical system
  • Imaging corneal curvimeter optical system

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Embodiment Construction

[0031] specific implementation

[0032] Such as figure 1 As shown, the structure of the novel imaging keratometer optical system that the present invention relates to includes a circular cursor 1-1, a primary imaging system 1-2, a half-transparent mirror group 1-4, a secondary imaging system 1-5, and a CCD Receivers 1-6. The optical axis of the primary imaging system coincides with the optical path direction of the ring cursor, the half-transparent mirror is located on the outgoing optical path of the primary imaging system and forms an angle of 45 degrees with the optical path direction, and the reflective surface of the half-mirror faces the cornea 1 of the subject In the direction of -3, the secondary imaging system is set on the transmitted light path of the half-mirror, and the CCD receiver is located on the image plane of the secondary imaging system.

[0033] In addition, the keratometer also includes a calibration system, the structural diagram of the calibration ...

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Abstract

The invention discloses an imaging corneal curvimeter optical system, and aims to accurately measure the curvature radius and the astigmatism of the front surface of a human cornea. The optical system comprises an annular cursor, a primary imaging system, a semi-transparent semi-reflective mirror, a secondary imaging system and a CCD (charge coupled device) receiver. The optical system is characterized in that the annular cursor is imaged by the primary imaging system, reflected by the front surface of the cornea and imaged by the secondary imaging system, and an annular image is finally formed on the CCD receiver. The formed annular image is analyzed by the aid of modern image processing technology, and the curvature radius and the astigmatism of the measured cornea are calculated. The measuring range is 5.5mm-11mm, and measuring precision reaches 0.072D when the curvature radius of the cornea is 7.8mm. Measured corneas with different curvature radiuses are measured in an external focusing measuring mode by a novel imaging corneal curvimeter. In addition, the corneal curvimeter comprises a calibration system to improve precision. The optical system has the advantages of wide measuring range and high measuring precision.

Description

technical field [0001] The invention belongs to the field of optical testing instruments and relates to an optical system of a novel imaging keratometer. Background technique [0002] The cornea is the most important refractive medium of the human eye, accounting for about 2 / 3 of the total refractive power of the human eye. Accurately measuring the refractive state of the cornea is of great importance for guiding the wearing of contact lenses, corneal refractive surgery, and implantation of intraocular lenses. meaning. [0003] Humans have a long history of measuring the curvature of the cornea of ​​the human eye. At first, people used ruler and compasses to roughly measure the radius of curvature of the human cornea. Until the second half of the eighteenth century, scientists began to propose some methods for accurately measuring the curvature of the cornea in order to study the adjustment mechanism of the human eye's visual process. However, due to the limitations of t...

Claims

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Application Information

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IPC IPC(8): A61B3/107
Inventor 王肇圻何远清刘永基翟奕
Owner NANKAI UNIV
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