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US 8,540,370 B2Granted
Devices and methods for selecting intraocular lenses
AssigneeAMO Groningen B.V.
InventorSverker Norrby
Life of this patent
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Abstract
The invention relates to devices and methods for selecting IOLs for implantation and eye models useful with the methods. One method comprises the steps of determining the axial eye length, the pupil size at a desired light level; the desired postoperative refraction; determining an aspheric representation of the corneal curvature and determining the location of the plane of fixation of the IOL following implantation.
Claims46
A method of selecting an IOL to be implanted in the eye of a subject comprising:
- a) determining an axial eye length and a pupil size at a desired light level and determining at least one of a desired postoperative refraction and a desired postoperative spherical aberration;
- b) determining an aspheric representation of a corneal curvature;
- c) selecting an IOL with predetermined power and asphericity, and determining a location of the lens haptic plane (LHP);
- d) employing the results of previous sections to establish an eye model for the eye of the subject, the eye model including the axial eye length, the pupil size, the aspheric representation of the corneal curvature, and the LHP;
- e) computing with a ray tracing routine and the axial eye length, the pupil size, the aspheric representation of the corneal curvature, and the LHP of said eye model, an expected at least one of a postoperative refraction and postoperative spherical aberration;
- f) in the case that the at least one of the expected postoperative refraction and postoperative spherical aberration is not within a predetermined criteria, selecting another IOL with different power and/or asphericity and repeating steps d) and e) until the at least one of the expected postoperative refraction and postoperative spherical aberrations is within the at least one of the desired postoperative refraction and desired postoperative spherical aberration;
- and
- g) selecting, for implantation, an implantable IOL of the nearest power and asphericity available.
5 more elements
An eye model suitable for selecting at least one combination of power and asphericity of an intraocular lens to be implanted in an eye of a subject, comprising:
- an axial eye length based on a measured axial eye length transformed to a human population average scale by addition of a transformation constant;
- a pupil size at a desired light level;
- an aspheric representation of at least one corneal curvature;
- a lens haptic plane location for fixation of the intraocular lens following implantation;
- and
- a ray tracing routine configured to calculate an expected at least one of a postoperative refraction and postoperative spherical aberration based at least in part on the axial eye length, the pupil size, the aspheric representation of the at least one corneal curvature, and the lens haptic plane location;
- and
- wherein the eye model is stored on a tangible computer readable memory.
5 more elements
A method of selecting an IOL to be implanted in the eye of a subject comprising:
- a) determining an axial eye length, a pupil size at a desired light level;
- b) determining an aspheric representation at least one corneal surface;
- c) selecting a first IOL and determining a location of a plane of fixation of the first IOL following implantation;
- d) establishing an eye model;
- e) based on the eye model, the first selected IOL, the axial eye length, the pupil size, the aspheric representation of the corneal curvature, and the plane of fixation, calculating an amount of postoperative spherical aberration using a ray tracing routine;
- f) based on e), selecting an implantation IOL to provide a selected amount of postoperative spherical aberration.
3 more elements
A method of selecting an IOL to be implanted in the eye of a subject, comprising:
- determining one or more ocular dimensions based on one or more measurements of at least one eye;
- selecting a desired postoperative refractive outcome;
- selecting first IOL having at least one of a power, an aspheric profile, and a lens plane;
- establishing an eye model based on the one or more characteristics of the at least one eye;
- determining a location of the lens plane;
- performing a calculation to determine a predicted postoperative refractive outcome based on the eye model, a ray tracing algorithm, the location of the lens plane, and the selected first IOL;
- comparing the predicted postoperative refractive outcome to the desired refractive outcome;
- based on the comparison, repeating the calculation with at least a second selected IOL having at least one of a different power, a different aspheric profile, and a different lens plane;
- and
- selecting an implantable IOL configured for implantation into the eye of a subject based at least in part on the repeated calculation.
7 more elements
A computer system for selecting an IOL for placement into an eye of a subject, comprising:
- a processor;
- and
- a computer readable memory coupled to the processor, the memory having stored therein:
- an array of ordered values, including:
- one or more ocular dimensions;
- a desired refractive outcome;
- at least one of a power, an aspheric profile, and a lens plane of one or more IOLs;
- parameters of an eye model based on one or more characteristics of at least one eye;
- sequences of instructions which, when executed by the processor, cause the processor to select an implantable IOL configured for implantation into the eye of the subject, the sequences of instructions configured to:
- determine a location of the lens plane;
- perform a calculation to determine a predicted postoperative refractive outcome based on the eye model, the location of the lens plane, and a ray tracing algorithm;
- compare the predicted postoperative refractive outcome to the desired refractive outcome;
- based on the comparison, repeat the calculation with an IOL having at least one of a different power, a different aspheric profile, and a different lens plane.
10 more elements
Dependencies are inferred from the claim text.