Contact lens and method for fitting and design
AssigneeBausch & Lomb Incorporated
InventorsIan G. Cox, Michele Lagana
Life of this patent
Estimating the term…
Abstract
Wavefront aberration measurements measured in response to design parameter changes in a contact lens, for example, are used to design and prescribe contact lenses offering improved vision quality. In-situ optical performance of trial lenses provides real-time, objectively determined data as a design model for the lenses. Lenses designed by the inventive process are described as well as a method for using an aberrometer to design and prescribe contact lenses.
Claims34
A contact lens having a physical design parameter determined by an objective wavefront measurement of a plurality of in-situ trial contact lenses each having a different value of the physical design parameter for a given correcting power.
A method for designing a contact lens, comprising:
- a) determining an objective measurement criteria of optical performance of a contact lens in-situ;
- b) determining a technique for measuring this criteria;
- c) determining a lens design parameter that can be varied to induce a change in the optical performance of the lens in-situ;
- d) measuring the in-situ optical performance of a test lens over a range of different design parameter values;
- and;
- e) selecting the design parameter value for designing a contact lens that gives a desired in-situ optical performance measurement.
A method for designing a contact lens, comprising:
- a) selecting a plurality of trial contact lenses each of which has a substantially similar refracting power and a different, respective, design parameter;
- b) obtaining a real-time wavefront measurement of the in-situ optical performance of each trial contact lens;
- c) monitoring the different design parameter values of the lenses in conjunction with each optical performance measurement;
- d) using the measure of the in-situ optical performance of the lens design to determine a preferred design parameter value;
- and
- e) designing a contact lens based upon the preferred design parameter value.
An improved method for prescribing a contact lens, comprising using a plurality of real-time wavefront measurements of the in-situ optical performance of a respective plurality of trial contact lenses as a function of a physical design parameter to determine the best in-situ optical performance for a statistically significant sample of subjects.
An improved method for prescribing a contact lens, comprising:
- a) providing a plurality of trial lenses each of which provides a desired correction for sphere and cylinder, wherein each of the trial lenses has a different, respective, design parameter;
- b) consecutively providing each trial lens to a subject in-situ;
- c) obtaining a real-time wavefront measurement of the in-situ optical performance of each lens;
- and
- d) prescribing a contact lens for the subject in accord with the best measured optical performance of the trial lenses.
An improved method for providing a contact lens, comprising:
- a) obtaining a refraction measurement of a subject's eye;
- b) selecting a plurality of trial contact lenses each of which have a similar refractive correction power and a different, respective, design parameter;
- c) applying a first one of the trial contact lenses on the subject's eye;
- d) obtaining a wavefront measurement of the in-situ optical performance of the first one trial contact lens;
- e) removing said trial contact lens and applying a different, next one of the trial contact lenses on the subject's eye;
- f) obtaining a wavefront measurement of the in-situ optical performance of the next trial contact lens;
- g) repeating steps (e) and (f) for a desired number of trial lenses;
- and
- h) providing a contact lens similar to the trial lens that provides the optimum optical performance in-situ.
A method for using an aberrometer for designing and/or prescribing a contact lens, comprising:
- making a wavefront measurement of a subject's eye with a first in-situ trial lens having a known design parameter value that affects optical performance;
- making a next wavefront measurement of a subject's eye with a next in-situ trial lens having a different valued, respective, known design parameter that affects optical performance;
- determining an objective optical performance metric of each trial lens based upon the respective wavefront measurement;
- and
- designing and/or prescribing a contact lens based upon the design parameter of the trial lens that provided the optimum optical performance metric.
A method for designing a contact lens, comprising the steps of:
- a) providing a simultaneous style multi-focal trial contact lens to a patient having astigmatic presbyopia such that the trial lens provides a subjectively determined satisfactory visual quality for near-vision and far-vision defocus without an astigmatic correction;
- b) measuring a wavefront aberration of the in-situ placement of the trial lens and determining an objective vision quality metric corresponding to the subjectively determined visual quality;
- and
- c) changing a design parameter of the trial lens to reduce the astigmatism aberration and so changing a spherical aberration of the wavefront measurement until a value of an associated objective vision quality metric becomes substantially the same as the determined objective vision quality metric.
Dependencies are inferred from the claim text.