Devices and methods of selecting intraocular lenses
First Claim
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1. A method of selecting an IOL to be implanted in the eye of a subject comprising:
 a) determining an axial eye length, the pupil size at a desired light level and determining at least one of a desired postoperative refraction and a desired spherical aberration;
b) determining an aspheric representation of the corneal curvature(s);
c) selecting an IOL with predetermined power and asphericity, and determining the location of the lens haptic plane (LHP);
d) employing the results of previous sections to establish an eye model;
e) computing, by means of a ray tracing routine with said eye model, an expected at least one of a postoperative refraction and spherical aberration;
f) in the case that the at least one of the expected postoperative refraction and 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 spherical aberrations is within the at least one of the desired postoperative refraction and desired spherical aberration; and
g) selecting, for implantation, an implantable IOL of the nearest power and asphericity available or designing an implantable IOL that results in the at least one of the desired postoperative refraction and the desired spherical aberration.
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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.
74 Citations
47 Claims

1. A method of selecting an IOL to be implanted in the eye of a subject comprising:

a) determining an axial eye length, the pupil size at a desired light level and determining at least one of a desired postoperative refraction and a desired spherical aberration;
b) determining an aspheric representation of the corneal curvature(s);
c) selecting an IOL with predetermined power and asphericity, and determining the location of the lens haptic plane (LHP);
d) employing the results of previous sections to establish an eye model;
e) computing, by means of a ray tracing routine with said eye model, an expected at least one of a postoperative refraction and spherical aberration;
f) in the case that the at least one of the expected postoperative refraction and 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 spherical aberrations is within the at least one of the desired postoperative refraction and desired spherical aberration; and
g) selecting, for implantation, an implantable IOL of the nearest power and asphericity available or designing an implantable IOL that results in the at least one of the desired postoperative refraction and the desired spherical aberration.  View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)


27. An eye model suitable for selecting at least one combination of the power and asphericity of the intraocular lens to be implanted in the eye of a subject, comprising:

an axial eye length based on a measured axial eye length transformed to the human population average scale by addition of a transformation constant;
a pupil size at a desired light level;
an aspheric representation of the corneal curvature(s); and
a lens haptic plane location for fixation of IOL following implantation.  View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 40)


39. 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, and an preferred amount of at least one of postoperative refraction and postoperative spherical aberration;
b) determining an aspheric representation at least one corneal surface;
c) selecting a first IOL and determining the location of the plane of fixation of the first IOL following implantation;
d) establishing an eye model;
e) based on the eye model, calculating an amount of at least one of a postoperative refraction and a postoperative spherical aberration;
f) based on e), selecting an implantation IOL having a preselected amount of power and asphericity or designing an implantation IOL that provides a preselected amount of postoperative refraction and spherical aberration.


41. 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 refractive outcome;
selecting an IOL having at least one of a power, an aspheric profile, and a lens plane;
establishing an eye model based on one or more characteristics of the at least one eye;
determining a location of the lens plane;
performing a calculation to determine a predicted refractive outcome based on the eye model and a ray tracing algorithm;
comparing the predicted refractive outcome to the desired refractive outcome;
based on the comparison, repeating the calculation with an 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.  View Dependent Claims (42, 43, 44, 45, 46)


47. A computer system for selecting an IOL for placement into the 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 a subject, the sequences of instructions including;
determining a location of the lens plane;
performing a calculation to determine a predicted refractive outcome based on the eye model and a ray tracing algorithm;
comparing the predicted refractive outcome to the desired refractive outcome;
based on the comparison, repeating the calculation with an IOL having at least one of a different power, a different aspheric profile, and a different lens plane.

1 Specification