Multifocal contact lenses and related methods and uses to improve vision of presbyopic subjects

A method of supplying multifocal contact lenses for a presbyopic subject to an eye care practitioner, said presbyopic subject having a dominant eye and a non-dominant eye, said method comprising:

• manufacturing multifocal contact lenses, said multifocal contact lenses comprising a first multifocal contact lens for the dominant eye and a second multifocal contact lens for the non-dominant eye, each of the first multifocal contact lens and the second multifocal contact lens comprising an optic zone having an optic zone center and an optic zone perimeter spaced radially away from the optic zone center and defining a boundary between the optic zone and a peripheral zone, said optic zone having an aspheric power profile extending from the optic zone center towards the optic zone perimeter and providing a near vision refractive power and a distance vision refractive power such that each of said multifocal contact lenses has a single Add power, said Add power being the absolute difference in power between the near vision refractive power and the distance vision refractive power;
• providing said multifocal contact lenses to an eye care practitioner for fitting a presbyopic subject with the first multifocal contact lens and the second multifocal contact lens,
• wherein the first multifocal contact lens has a distance vision refractive power effective in providing the presbyopic subject with a high contrast visual acuity of 20/30 or better for the dominant eye at a viewing distance of at least 6 meters,
• wherein the second multifocal contact lens has a near vision refractive power effective in providing the presbyopic subject with a high contrast visual acuity of 20/30 or better for the non-dominant eye at a viewing distance of about 60 centimeters or less, and has a distance vision refractive power that is offset by about +0.25 diopters to about +1.25 diopters relative to the distance power correction for the non-dominant eye of the presbyopic subject, and
• wherein the binocular visual acuity provided to the presbyopic subject by the pair of the first and second multifocal contact lenses worn simultaneously is greater than a monocular visual acuity provided to the presbyopic subject by either the first multifocal contact lens or the second multifocal contact lens, alone.

A method of supplying multifocal contact lenses to a presbyopic subject, said presbyopic subject having a dominant eye and a non-dominant eye, said method comprising:

• receiving an order for multifocal contact lenses, said multifocal contact lenses comprising a first multifocal contact lens for the dominant eye and a second multifocal contact lens for the non-dominant eye, each of the first multifocal contact lens and the second multifocal contact lens comprising an optic zone having an optic zone center and an optic zone perimeter spaced radially away from the optic zone center and defining a boundary between the optic zone and a peripheral zone, said optic zone having an aspheric power profile extending from the optic zone center towards the optic zone perimeter and providing a near vision refractive power and a distance vision refractive power such that each of said multifocal contact lenses has a single Add power, said Add power being the absolute difference in power between the near vision refractive power and the distance vision refractive power;
• providing said multifocal contact lenses to the presbyopic subject,
• wherein the first multifocal contact lens has a distance vision refractive power effective in providing the presbyopic subject with a high contrast visual acuity of 20/30 or better for the dominant eye at a viewing distance of at least 6 meters,
• wherein the second multifocal contact lens has a near vision refractive power effective in providing the presbyopic subject with a high contrast visual acuity of 20/30 or better for the non-dominant eye at a viewing distance of about 60 centimeters or less, and has a distance vision refractive power that is offset by about +0.25 diopters to about +1.25 diopters relative to the distance power correction for the non-dominant eye of the presbyopic subject, and
• wherein the binocular visual acuity provided to the presbyopic subject by the pair of the first and second multifocal contact lenses worn simultaneously is greater than the monocular visual acuity provided to the presbyopic subject by either the first multifocal contact lens or the second multifocal contact lens, alone.

A method of fitting a presbyopic subject with multifocal contact lenses, said presbyopic subject having a dominant eye and a non-dominant eye, said method comprising:

• selecting a first multifocal contact lens for the dominant eye of the presbyopic subject;
• and
• selecting a second multifocal contact lens for the non-dominant eye of the presbyopic subject,
• each of the first multifocal contact lens and the second multifocal contact lens comprising an optic zone having an optic zone center and an optic zone perimeter spaced radially away from the optic zone center and defining a boundary between the optic zone and a peripheral zone, said optic zone having an aspheric power profile extending from the optic zone center towards the optic zone perimeter and providing a near vision refractive power and a distance vision refractive power such that each of said multifocal contact lenses has a single Add power, said Add power being the absolute difference in power between the near vision refractive power and the distance vision refractive power,
• wherein the first multifocal contact lens has a distance vision refractive power effective in providing the presbyopic subject with a high contrast visual acuity of 20/30 or better for the dominant eye at a viewing distance of at least 6 meters,
• wherein the second multifocal contact lens has a near vision refractive power effective in providing the presbyopic subject with a high contrast visual acuity of 20/30 or better for the non-dominant eye at a viewing distance of about 60 centimeters or less, and has a distance vision refractive power that is offset by about +0.25 diopters to about +1.25 diopters relative to the distance power correction for the non-dominant eye of the presbyopic subject, and
• wherein the binocular visual acuity provided to the presbyopic subject by the pair of the first and second multifocal contact lenses worn simultaneously is greater than the monocular visual acuity provided to the presbyopic subject by either the first multifocal contact lens or the second multifocal contact lens, alone.