Posters

Effect of spherical equivalent error on visual acuity at various distances

Poster Details

First Author: K.Hayashi JAPAN

Co Author(s):    T. Sato   C. Igarashi   M. Yoshida              

Abstract Details

Purpose:

To examine the effect of manifest refraction spherical equivalent error on visual acuity (VA) at various distances in eyes that received a trifocal intraocular lens (IOL).

Setting:

Hayashi Eye Hospital, Fukuoka, Japan.

Methods:

Sixty eyes of 30 patients who underwent bilateral implantation of a trifocal IOL (Alcon PanOptix®; TFNT00) were enrolled. Corrected VA from far to near distances was measured using an all-distance vision tester after simulating the spherical equivalent error by adding spherical lenses with refractive powers of +1.0, +0.5, 0D, -0.5, and -1.0 diopters (D); addition of a plus lens simulates myopia, while addition of a minus lens simulates hyperopia.

Results:

Mean VA at all distances differed significantly among the spherical lens added groups (P≤.0374). Mean distance VA at ∞, 5.0, and 3.0 m was significantly worse in all added groups (+1.0D, +0.5D, -0.5D, and -1.0D added groups) than in the none-added group (P<.0001). Mean intermediate VA at 1.0 and 0.7 m did not differ significantly between each of the added groups and the none-added group. Mean near VA at 0.3 m was significantly better in the +1.0D and +0.5D groups and significantly worse in the -0.5D and -1.0D added groups than in the none-added group (P≤.0044).

Conclusions:

A manifest spherical equivalent error of slight myopia significantly improved near VA but worsened distance VA, while that of slight hyperopia worsened both distance and near VA in eyes with trifocal IOLs, suggesting that slight myopia is a better target refraction than slight hyperopia, although emmetropia is the optimum target.

Financial Disclosure:

None