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Embodiment 1
[0065] like figure 1 As shown, the surgical objective lens with large field of view and large numerical aperture in this embodiment sequentially includes: a first lens group 10 with positive refractive power, and a second lens with negative refractive power along the optical axis from the image plane to the surgical processing surface Group 20, a third lens group 30 with positive power.
[0066] The first lens group 10 is a combined lens group with positive refractive power, including single or multiple lenses, which serve as the entrance pupil of the overall system and provide the entire objective lens with the function of collecting surgical laser light.
[0067] In this embodiment, the first lens group 10 is a single biconvex lens, that is, the first biconvex lens 11, and its refractive index n11 satisfies:
[0121] Different from Embodiment 1, the system in this embodiment adds a flat lens with a thickness of 0.5mm, a refractive index of 1.330, and a dispersion coefficient of 55.800 between the convex lens 32 and the surgical surface. The laser is focused at a depth of 0.5 mm below the cornea.
[0122] like Figure 8-Figure 14 As shown, similar to Example 1, the effect of the surgical objective lens in this example still reaches the diffraction limit level, the distortion is still less than 0.2%, and the Strehl ratio is still above 0.9.
[0123] The specific parameters of the optical lens of this embodiment are shown in the table below:
[0126] Different from Embodiment 1, the last side of the surgical objective lens in this embodiment, i.e. the rear surface of the convex lens 32, has an infinite radius of curvature, i.e. the rear surface of the convex lens 32 is a plane. The instruments are seamlessly connected, and this effect can be achieved by using a flat surface.
[0127] like Figure 15-Figure 21 As shown, similar to Example 1, the effect of the surgical objective lens in this example still reaches the diffraction limit level, the distortion is still less than 0.2%, and the Strehl ratio is still above 0.9.
[0128] The specific parameters of the optical lens of this embodiment are shown in the table below:
[0129] plane number radius thickness n e
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Abstract
The invention discloses a large-view-field and large-numerical-aperture surgical objective lens for ophthalmic surgery, and belongs to the field of optical lenses. The objective lens sequentially comprises a first lens group, a second lens group and a third lens group from an image surface to a surgical processing surface along an optical axis, the first lens group is a lens group with positive focal power, comprises one or more lenses and is used for collecting incident laser; the second lens group is a multi-balsaming lens group with negative focal power and is used for carrying out chromatic aberration and dispersion compensation on the collected laser; and the third lens group is a multi-balsaming lens group with positive focal power and is used for reducing image field bending and large-view-field distortion of the laser caused by light rays with different view field angles. On the premise that the optical quality is not lost, a large view field and a large numerical aperture can be achieved, the number of used lenses is small, and the device can be effectively used for a laser ophthalmologic operation.
Description
technical field [0001] The invention belongs to the technical field of optical lenses, and more specifically relates to a surgical objective lens with large field of view and large numerical aperture used in ophthalmic surgery. Background technique [0002] Nowadays, the number of myopia is increasing day by day, and the ways of myopia correction can be divided into two kinds: in vitro correction and surgical correction. The traditional in vitrocorrection method, that is, to correct vision by wearing glasses, brings inconvenience to daily life. Vision correction through surgery has high stability, is convenient and quick, and does not affect daily life, so it has gradually become the choice of vision correction for myopia. [0003] Vision correction solutions through surgery are divided into mechanical cutting, excimerlaser cutting, femtosecondlaser cutting and other plans. Among them, femtosecondlaser cutting has the advantages of non-contact, tomographic slicing abil...
Claims
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