6 results about "Posterior lens" patented technology

The invention discloses a postoperative lens capsular bag parameter prediction method, system, medium and equipment, and belongs to the field of biomedicines.The method comprises the steps that pre-operative anterior segment OCT images are obtained, and lens contour line parameters corresponding to multiple two-dimensional lens images with different axial angles in the anterior segment OCT images are extracted; according to each crystalline lens contour line parameter, constructing a crystalline lens three-dimensional model; performing three-dimensional Delaunay triangulation on the crystalline lens three-dimensional model to obtain each tetrahedral mesh; calculating the surface area of the crystalline lens three-dimensional model according to the area of the exposed triangular patch of each tetrahedral mesh; and taking half of the surface area as the posterior capsular membrane area of the postoperative crystalline lens, and calculating and outputting the simulated diameter of the capsular bag of the postoperative crystalline lens. Therefore, by implementing the method, the problem that the postoperative lens capsular bag diameter cannot be simply and effectively predicted and calculated in the prior art can be solved.

Disclosed are accommodating intraocular lenses with a phase shifting lens surface profile, intraocular lenses with a mechanical accommodating structure, and methods of use thereof. For example, an intraocular lens is disclosed comprising an optic portion comprising an anterior lens and a posterior lens and an accommodating mechanical structure coupled to the optic portion. The anterior lens can comprise a phase shifting lens surface profile. The mechanical accommodating structure can comprise a plurality of compressible haptics. Each of the compressible haptics can be shaped as an annulus sector and can comprise a fluted or plicated portion configured to allow the haptics to compress or expand.

Zoom lens (1) comprising as a whole four or five lens groups, which, starting from one side of the object, consist of a first lens group (G1) having a positive refractive power and fixed relative to an image plane (Sim) during a change in magnification, a second lens group (G2) having a negative refractive power and moving during the change in magnification, one or two intermediate lens groups (G3, G4) comprising an mp lens group (G3 or G4) having a positive refractive power and moving during the change in magnification, and a rearmost lens group (G4 or G5) located at the image-side position of the entire system, having a positive refractive power and fixed relative to the image plane (Sim) during the change in magnification, the change in magnification is achieved by changing all distances between the adjacent lens groups, the most posterior lens group (G4 or G5), in order starting from the object side, consists of an anterior group (L41 to L44 or L51 to L54) with a positive refractive power, a middle group (Ois) with a negative refractive power and a posterior group (L48 to L51 or L58 to L61) with a positive refractive power, The air gaps between the front group and the middle group, and between the middle group and the rear group, remain constant during magnification changes and focusing. the anterior group includes at least two positive lenses and at least one negative lens, Image stabilization is achieved by shifting only the center group in directions perpendicular to the direction of the optical axis (Z). wherein the back group comprises a cemented lens (L49, L50 or L59, L60) formed by a positive lens and a negative lens cemented together, and the following conditional expressions (1) and (2) are satisfied: 0.20 < FGr3 / FGr < 0.45 1.75 < FGr1 / FGr3 < 3.00 where FGr3 is a focal length of the rear group of the furthest rear lens group, FGr is a focal length of the furthest rear lens group, and FGr1 is a focal length of the front group of the furthest rear lens group.

Zoom lens consisting as a whole of four or five lens groups, which, starting from one side of the object, comprise a first lens group (G1) with a positive refractive power, a second lens group (G2) with a negative refractive power, one or two intermediate lens groups comprising an mp lens group with a positive refractive power, and a rearmost lens group located at the image-side position of the entire system and having a positive refractive power. where a change in magnification is achieved by changing all distances between the adjacent lens groups, the first lens group (G1), in order starting from the object side, consists of a negative lens, a positive lens, a positive lens and a positive lens, The most posterior lens group, in order starting from the object side, consists of an anterior group with a positive refractive power, a medial group with a negative refractive power and a posterior group with a positive refractive power. The air gaps between the front group and the middle group, and between the middle group and the back group, remain constant during magnification changes and during focusing. the anterior group comprises two positive lenses and one negative lens, Image stabilization is achieved by shifting only the center group in directions perpendicular to the optical axis (Z). The Rück group comprises one positive lens and two negative lenses, and the following condition expression (1) is satisfied: 0.11 < | fGr 2 | / ft < 0.25 where fGr2 is a focal length of the center group and ft is a focal length of the entire system when the lens at the telephoto end is focused on an object at infinity.

Methods and apparatus are provided for optical coherence metrology or tomography across an extended area of an eye with improved registration. At least two optical coherence tomograms are acquired, with each tomogram containing data from regions of an anterior surface of the eye that are at least partially overlapping, and data from one or more deeper structures such as the retina or the anterior or posterior lens surfaces. The tomograms are then processed to register the data from the overlapping portions of the anterior surface regions, thereby registering the data from the deeper structures. In certain embodiments the reference arm of the apparatus comprises a compound reflector having at least two axially separated reflective surfaces for applying differential delays to different portions of the reference beam. The depth of field of the apparatus is thereby extended to enable measurement of eye length. In certain embodiments eye length measurements at a number of angles of incidence provide information on total eye shape.

Disclosed are accommodating intraocular lenses with a phase shifting lens surface profile, intraocular lenses with a mechanical accommodating structure, and methods of use thereof. For example, an intraocular lens is disclosed comprising an optic portion comprising an anterior lens (108) and a posterior lens (110) and an accommodating mechanical structure (104) coupled to the optic portion. The anterior lens can comprise a phase shifting lens surface profile. The mechanical accommodating structure can comprise a plurality of compressible haptics. Each of the compressible haptics can be shaped as an annulus sector and can comprise a fluted or plicated portion configured to allow the haptics to compress or expand.