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

摘要

Multifocal contact lenses and methods and uses are described. The multifocal contact lenses include an optic zone. The optic zone has an aspheric power profile that provides a near vision refractive power and a distance vision refractive power, and provides an Add power that corresponds to the difference between the near vision refractive power and the distance vision refractive power. The multifocal contact lenses can improve binocular vision of presbyopic subjects by being prescribed such that the non-dominant eye contact lens is over-corrected for distance vision, and both multifocal contact lenses are under-corrected for the Add power requirement of the subject. Batches and sets of multifocal contact lenses are also described.

主权项

1. A method of prescribing multifocal contact lenses to a presbyopic subject, said presbyopic subject having a dominant eye and a non-dominant eye, said method comprising:
fitting a presbyopic subject, said presbyopic subject requiring an Add power correction of at least 1.25 diopters (D), with a pair of multifocal contact lenses, wherein a first multifocal contact lens of the pair comprises a first aspheric power profile derived from a first nominal aspheric power profile, and a second multifocal contact lens of the pair comprises a second aspheric power profile derived from the first nominal aspheric power profile, but said second aspheric power profile providing a distance vision refractive power offset by about +0.25 D to about +1.25 D relative to the distance power correction for the non-dominant eye of the presbyopic subject, whereby monocular distance visual acuity is different for each eye with each contact lens, and binocular summation is maintained when each contact lens is simultaneously worn.