Kinetic visual acuity, stereopsis, and ocular deviation with an implantable collamer lens.

Purpose: To compare kinetic visual acuity, stereopsis, ocular deviation, and fusion amplitude before and after implantable collamer lens (ICL) surgery.

Setting: Sanno Hospital.

Design: Retrospective analysis.

Methods: The charts of adult patients who underwent implantation of an ICL with a central aquaport (V4c) for emmetropia were reviewed. The mean preoperative spherical equivalent and subjective astigmatism were -7.87 diopters (D) ± 3.13 (SD) and -0.75 ± 0.78 D, respectively. All measurements were obtained with full refraction before surgery and without spectacle correction after surgery. The kinetic visual acuity was measured with the AS-4D device. Stereopsis and ocular deviation were measured with the Titmus Stereotest and an alternate prism cover test, respectively. Fusion amplitude was determined from breakpoints measured using a prism.

Results: The study comprised 29 adult patients (58 eyes). One month postoperatively, the mean safety and efficacy indices were 1.13 ± 0.20 and 0.96 ± 0.25, respectively, and 57 eyes (98.7%) were within ±0.5 D of the target correction. The mean kinetic visual acuity (logarithm of the minimum angle of resolution) was 0.30 ± 0.21 preoperatively and 0.20 ± 0.15 (Snellen 20/40 versus 20/32) postoperatively and the mean stereopsis (seconds of arc), 48.5 ± 1.6 versus 41.5 ± 1.1; both improved significantly (P < .001 and P = .012, respectively). The mean distance ocular deviation (-4.0 ± 3.8 prism diopters [Δ] versus 2.8 ± 3.6 Δ; P = .002) and near ocular deviation (-6.5 ± 6.7 Δ versus 5.4 ± 6.9 Δ; P = .04) decreased significantly. The fusion amplitude increased for near vision only.

Conclusions: ICL implantation improved kinetic visual acuity and stereopsis, decreased ocular deviation, and increased near fusion amplitude.