Toric lens with decreased sensitivity to cylinder power and rotation and method of using the same
AssigneeAMO Groningen B.V.
InventorsTheophilus Bogaert, Hendrik A. Weeber, Huawei Zhao
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Abstract
A method, system and apparatus for vision correction are disclosed. The method, system and apparatus include a toric intraocular element for correcting astigmatism and having a cylinder power, and a depth of focus extender coupled to the toric intraocular element, the depth of focus extender extending a depth of focus. The extended depth of focus may reduce sensitivity of the toric intraocular element to at least one of rotation and selected cylinder power.
Claims14
A method for decreasing sensitivity of astigmatic correction to errors of cylinder power selection and lens rotational alignment, comprising:
- receiving a measure of astigmatism;
- receiving a selection of a toric lens to reduce the astigmatism;
- receiving a determination of a depth of focus extension for coupling with the selected toric lens;
- coupling the determined depth of focus extension and the selected toric lens;
- inserting the coupled depth of focus extension and the selected toric lens in a line of sight.
A method of design of an optical element for decreasing the sensitivity of astigmatic correction to errors of cylinder power selection and lens rotational alignment, said method comprising:
- measuring astigmatism to be corrected;
- selecting a toric lens suitable for correcting said measured astigmatism;
- determining an extended depth of focus to provide at least a tolerance of the decrease of the sensitivity based on the selected toric lens and average rotational alignment;
- and
- designing an element having the determined extended depth of focus element for coupling with said toric element.
An intraocular lens, comprising:
- an optic comprising a first surface having a first shape and an opposing second surface having a second shape, the first and second shapes providing a refractive power;
- a diffractive pattern imposed on at least one of the first shape and the second shape;
- the first and second surfaces providing a base power and an add power;
- wherein, when the optic is placed in an intraocular lens plane of a physical eye model including a model cornea, the modulation transfer function of the eye model exceeds about 0.17, at a spatial frequency of about 50 line pairs per millimeter, over a range of at least about 1.7 Diopters.
An intraocular lens, comprising:
- a first surface having a first shape and an opposing second surface having a second shape, the first and second shapes providing a refractive power;
- a diffractive pattern imposed on the first shape or the second shape;
- the first and second surfaces providing a base power and an add power;
- the intraocular lens having a depth of focus, when illuminated by a light source, that is at least about 30% greater than that of an intraocular reference lens without the diffractive pattern, the intraocular reference lens having a refractive power that is equal to the base power of the intraocular lens.
Dependencies are inferred from the claim text.