Non-contact intraocular pressure detection system and method based on low-coherence optical interference

Abstract

The invention discloses a non-contact intraocular pressure detection system based on low-coherence optical interference. The system comprises an optical division and return optical path, a signal acquisition and calibration optical path, a reference arm optical path, a data acquisition and storage control module, a terminal data processing module and a display and mechanical control terminal. According to the system, intraocular pressure is measured on the premise that the inner surface layer of the cornea is pressed flat, a longitudinal three-dimensional method is adopted to process data, a fixation light source is arranged at the end, coaxial with a first convergent lens, of a semi-reflecting and semi-transmitting lens in the signal acquisition and calibration optical path, so that a scanning light source and the fixation light source are integrated to be coaxial with the gas injection direction, and therefore intraocular pressure measurement precision and speed are increased; besides, a light beam needs to be subjected to luminous power detection before entering the eyeball, so that detection safety is improved; meanwhile, in a gas generation device providing jet streams, a purifier is arranged between a piston and an air cavity, so that cleanness of jet streams is guaranteed; and due to the fact that the whole system is debugged before normal operation, safety, reliability and stability of the whole measurement process are guaranteed.

Description

technical field [0001] The invention relates to the technical field of intraocular pressure detection, in particular to a non-contact intraocular pressure detection system based on low coherent light interference and a detection method thereof. Background technique [0002] At this stage, there are many intraocular pressure measurement devices and methods, which are mainly divided into two categories: contact intraocular pressure measurement and non-contact intraocular pressure measurement. Among the many measurement methods, the Goldman applanation tonometer is the representative. Contact measurement is the most reliable intraocular pressure measurement method at present, but this method needs to anesthetize the cornea during the operation, which has certain side effects on the examinee, and if the operation is not handled properly, it is very easy to cause infection ; And in non-contact intraocular pressure detection, similar problems can be well prevented from taking plac...

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Problems solved by technology

[0003] Most of the existing non-contact intraocular pressure measurement methods use the flattening of the outer layer of the cornea as the reference standard for the intraocular pressure measurement value. Due to the certain flexibility of the cornea itself, the measurement results are too small

[0004] Chinese patent 201210413847.3 discloses a jet-type intraocular pressure detection device. The detection device generates air pressure to flatten the outer layer of the cornea through an air blowing device. At the same time, the position of the outer cornea and the time required for the flattening of the outer cornea are measured by combining CMOS or CCD in a longitudinal three-dimensional manner. Finally, convert the air pressure value of the emitted gas and the extraocular corneal information measured by CMOS or CCD to obtain the intraocular pressure value. However, this technology measures intraocular pressure based on the flattening of the outer layer of the cornea. Therefore, when the outer layer of the cornea is flattened, the inner layer of the cornea is still in a slightly curved state, which directly leads to a smaller measurement value. For the eyeball with a higher intraocular pressure value, the disadvantage will be more obvious

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