Customized LASIK treatment for myopia based on preoperative manifest refraction and higher order aberrometry: the Rochester nomogram.

Purpose: To develop and test the efficacy of myopic treatment, based on preoperative manifest refraction and higher order aberrations, in enhancing the postoperative refractive error following customized LASIK treatment and compare results with the manufacturer-recommended sphere offset Zyoptix treatment nomogram, which does not account for the preoperative higher order aberrations.

Methods: One hundred seventy-five myopic eyes (89 patients) were treated based on the Rochester nomogram, which specified the amount of myopia to be treated based on preoperative manifest refraction and higher order aberrations, including third order aberrations and spherical aberration. Postoperative refractive error was measured at 1 month and compared to that theoretically estimated with the Zyoptix nomogram.

Customized LASIK treatment for myopia: relationship between preoperative higher order aberrations and refractive outcome.

Purpose: To analyze the effect of preoperative higher order aberrations on postoperative sphere and cylinder outcome.

Methods: Three hundred thirty myopic eyes (mean: -3.32 +/- 1.

Does dilated wavefront aberration measurement provide better postoperative outcome after custom LASIK?

Purpose: To compare outcomes after custom LASIK based on non-pharmacologically dilated (natural mesopic pupil) and pharmacologically dilated wavefront aberration measurement.

Design: Case-control study.

Participants And Controls: The study group included 81 myopic eyes from 81 patients (mean preoperative spherical equivalent [SE], -4.

Text legibility and the letter superiority effect.

Effects of font design and electronic display parameters upon text legibility were determined using a threshold size method. Participants' visual acuity (inverse of the minimum detection size, representing the threshold legibility for each condition) was measured using upper- and lowercase letters and lowercase words in combinations of 6 fonts, 3 font-smoothing modes, 4 font sizes, 10 pixel heights, and 4 stroke widths. Individual lowercase letters were 10% to 20% more legible than lowercase words (i.

Visual acuity and the accuracy of the accommodative response.

Previous investigators have observed that some subjects show large amounts of accommodative lag. We hypothesized that less accurate accommodation might be associated with poorer visual acuity and/or smaller pupil sizes. Sixty subjects (30 emmetropes and 30 myopes) aged 20-30 years, participated.