Optical coherence biological measurer and method for biologically measuring eyes

Abstract

Disclosed is an optical coherence biological measurer. Parameters including corneal thicknesses, anterior chamber depths, lens thicknesses and visual axis lengths of eyes are obtained in once measurement by the aid of optical coherence measurement technology. The optical coherence biological measurer comprises a short coherence interferometry system detecting by the aid of balance, a retina splitimage focusing system, a visual axis aligning system with double fixation lamps, an optical length variable system, an eye positioning system and an auxiliary focusing system. The eye positioning system images the surface of a cornea and positions an eye, a system optical axis matches with an visual axis of the eye by the aid of the visual axis aligning system with the double fixation lamps, detecting light is respectively focused on a retina, a vitreous body and the cornea by an optical length and focus linkage device, simultaneously, optical length compensation of reference light is realized, the optical length variable system is used for realizing scanning measurement for return light signals of the retina, the vitreous body and the cornea, and the visual axis length, the vitreous bodythickness, the anterior chamber depth and the corneal thickness are calculated by the aid of output signals of a balance photoelectric detector.

Description

technical field [0001] The invention relates to the technical field of eye biological detection, in particular to an optical coherent biological measuring instrument and a method for performing eye biological measurement. Background technique [0002] Cataract is the first blinding eye disease in the world. With the improvement of phacoemulsification equipment and surgical methods and the emergence of new intraocular lenses, cataract surgery has changed from simple vision restoration surgery in the past to current refractive surgery. People pay more and more attention to the light state, so it is particularly important to obtain accurate intraocular lens power by accurate biological measurement before operation. The biological factors related to the calculation of intraocular lens power mainly include eye axis length, anterior chamber depth and corneal curvature etc. [0003] In order to measure parameters related to the power of artificial crystals, Haag-Streit AG disclose...

AI Technical Summary

Problems solved by technology

These two methods all use the method of short coherent light interference to measure the position of each layer of the eye, but there are still the following problems in the sensitivity and accuracy of the measurement: (1) for the measurement of parameters related to the calculation of the degree of intraocular lens , it must be ensured that the measurement is carried out along the visual axis of the eye, but the single fixation lamp used in these two methods cannot guarantee that the detection light and the visual axis coincide; (2) detect the interference of the reflected light of the retina and the reference light, and determine the The position of the eye is the key to the measurement of eye parameters, but due to the lack of retinal focusing system, the light reflected from the retina is weak, so the measurement sensitivity is low, and it cannot be applied to patients with deep cataract; (3) the lack of reference light part is high-speed The scanning system makes the measurement process longer, and the measurement results are easily affected by the patient and the environment

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