Human eye object focal length individual actual measurement detection method and device based on ciliary body

Abstract

The invention relates to the field of optical detection, in particular to a human eye real focal length individual actual measurement detection method and device based on a ciliary body, and the method comprises the steps: obtaining an actual measurement reference OCT optical signal set of a detected person focused on ciliary body parts under different standard focal lengths, extracting actual measurement reference light reflection coefficients of different layer points under different sites calibrated in an actual measurement reference OCT light signal set, and obtaining a'feature point-actual measurement reference light reflection coefficient curve 'under different standard focal lengths through normalization transformation; acquiring a'characteristic point-actual measurement inspection light reflection coefficient curve 'of the ciliary body part of the tested person focused at any focal length, and fitting the'characteristic point-actual measurement reference light reflection coefficient curve' to obtain the actual measurement focal length of the current tested person. According to the invention, human eye real object focal length detection based on the ciliary body is realized, eye stimulation or potential damage to retina and photoreceptor cells caused by laser irradiation on crystalline lenses of a detected person can be avoided, then human eye focus detection experience of sustainable laser irradiation is realized, and focal length detection is more accurate.

Description

technical field [0001] The invention relates to the field of optical detection, in particular to a ciliary body-based method and device for individual actual measurement and detection of the focal length of a human eye. Background technique [0002] Optical coherence tomography OCT (optical coherence tomography) is a high-resolution, non-contact biological tissue imaging technique, similar to ultrasound, but uses light instead of sound waves to generate images. By measuring light pulses that are scattered and propagated in the interior of the sample, processed to form high-resolution, in-depth images to analyze the internal microstructure of the living body without physical contact. Lateral scanning can quickly acquire clear images in non-invasive 2D and 3D. [0003] After OCT was introduced into ophthalmology, as an emerging non-contact and non-invasive ophthalmic imaging diagnostic technology, it can perform tomographic imaging of various ocular tissues through the reflec...

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Problems solved by technology

[0004] When traditionally using OCT to detect the focal length of the human eye, it is necessary to use a laser with a wavelength >1um to irradiate the eye lens. Because this type of method directly irradiates the transparent lens, and the unique lens effect of the lens itself, in some special cases, For example, impurities or lesions on the upper surface of the conjunctiva of the incident light cause necrosis of conjunctival cells to form scars or nodular degeneration to form microlenses, which then focus the light in a small area of ​​the laser passing through it, and it is possible to irradiate in a short time The sudden increase in the energy gathered by the laser at one point will cause potential light energy stimulation to the outermost cone and rod cells of the retina behind the lens. When the light energy reaches or exceeds the upper limit that the cells can withstand, it may cause discomfort. In severe cases Causes the burning or death of cells, causing the risk of vision loss or decline in localized spots

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