Common-path interference self-adaption optical OCT retinal imaging instrument

Abstract

The invention discloses a common-path interference self-adaption optical OCT retinal imaging instrument which comprises a beacon light source, an imaging light source, spherical reflectors, a wavefront correction device, a horizontal scanning galvanometer, a vertical scanning galvanometer, a center reflection edge transmission spectroscope, a wavefront sensor, a detector, an AO control system, an OCT control system, a computer, a wavefront controller and the like. The center reflection edge transmission spectroscope is arranged at the conjugate position of the pupil plane of a human eye. The diameter of the reference light beams formed through center reflection is smaller, the aberration introduced by the wavefront correction device after the reference light beams come and go twice is smaller and can be neglected; the aberration generated when sample light beams formed by edge transmission are illuminated into human eyes can be detected and corrected by the AO system. The interference spectrum formed by the light beams can rebuild high-resolution retinal images. The common-path interference self-adaption optical OCT retinal imaging instrument has the advantages of being resistant to environment interference, free of polarization adjustment, simple in dispersion compensation, capable of inhibiting corneal reflection stray light signals and reducing appearance size and lowering cost, suitable for long-optical-path AO-OCT systems and the like.

Description

technical field [0001] The invention relates to a high-resolution imaging device for the retina of a living human eye, in particular to a common-path interference adaptive optics OCT retinal imager. Background technique [0002] The retina is a complex layered structure. Within a thickness of about 300 μm, it contains about ten layers of tissue from the nerve fiber layer to the pigment epithelial cell layer. Each has different tissue components, structural forms, and functions. Layer observation helps to find the main cause of visual formation and lesions. Compared with conventional and confocal microscopes, the horizontal and vertical resolutions of optical coherence tomography (OCT) technology are independent of each other, and are determined by the focusing conditions of the beam and the bandwidth of the light source, so it is possible to obtain high horizontal and vertical resolutions at the same time. High vertical resolution. By using an ultra-broadband light source,...

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Problems solved by technology

[0008] 3) Due to the need for a separate reference arm system and polarization state controller, etc., this increases the cost of the AO-OCT system, and the high instrument cost is also one of the obstacles hindering its practical application

But so far, there has not been any report on the AO-OCT system using the common path interference structure, let alone its application in the field of ophthalmology

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