Methods and devices for refractive correction of eyes

摘要

Methods and devices are provided to obtain refractive correction with superior visual acuity (e.g., 20/10) by achieving an astigmatism-free customized refractive correction. The astigmatism-free customized refractive correction involves obtaining an objective and precise measurement of cylindrical power in a resolution between 0.01 D and 0.10 D in an eye using an objective aberrometer, reliably relating the cylindrical axis obtained from the objective aberrometer to that in a phoroptor, determining an optimized focus error of an eye through subjective refraction with a phoroptor, generating a customized refraction by combining the objective measured cylindrical power, the objective measured cylindrical axis, and the subjectively measured focus power, fabricating a custom lens with a tolerance finer than 0.09 D based on the generated customized refraction, and delivering an ophthalmic lens that can provide an astigmatism-free refractive correction for an eye.

主权项

1. An ophthalmic lens for refractive correction of an eye, comprising:
a first toric surface that is a front surface of the lens; and a second toric surface that is a back surface of the lens; wherein said first toric surface has a first cylindrical power and said second toric surface has a second cylindrical power; and wherein one of said first and said second toric surfaces has a dominant cylindrical power and the other one of said first and said second toric surfaces has a tuning cylindrical power in order to achieve an overall cylindrical power in a resolution finer than 0.25 D; and wherein at least one of said first cylinder power and said second cylinder power is equal to or less than 0.25 D.