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International Ophthalmology

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01-08-2019 | Original Paper

Corneal remodeling and spatial profiles following small incision lenticule extraction

Authors: Lin Zhang, Yan Wang, Wei Zhao, Wenbo Cheng, Tong Cui

Published in: International Ophthalmology | Issue 8/2019

Abstract

Purpose

To evaluate the three-dimensional corneal spatial profiles following small incision lenticule extraction (SMILE) based on corneal asphericity, thickness, and volume.

Materials and methods

Eighty-three eyes in 83 patients who underwent SMILE were examined before and 1 and 6 months after surgery. The asphericity of the anterior and posterior corneal surfaces was analyzed. Corneal volume (CV) was measured in corneal regions measuring 3.0 mm, 5.0 mm, and 7.0 mm in diameter. Mean corneal thickness (CT) values were acquired at the apex (0.0 mm) and in four concentric radial zones from the apex (with diameters of 2.0, 4.0, 6.0, and 8.0 mm).

Results

The mean anterior Q value increased from − 0.32 preoperatively to 0.67 at 1 month and 0.62 at 6 months postoperatively. The mean posterior Q value decreased from − 0.30 preoperatively to − 0.26 at 1 month and to − 0.25 at 6 months postoperatively. The CV increased by 0.05 ± 0.06 mm³ (1.40%), 0.06 ± 0.11 mm³ (0.83%), and 0.09 ± 0.17 mm³ (0.73%) along the radial zones with respective diameters of 3.0 mm, 5.0 mm, and 7.0 mm. The CT increased by 6.02 ± 6.48 µm (1.36%) at the apex and then decreased with increasing distance from the center, i.e., to 5.52 ± 6.31 µm (1.20%) at 2.0 mm, 4.72 ± 6.55 µm (0.92%) at 4.0 mm, 4.47 ± 7.86 µm (0.75%) at 6.0 mm, and 4.86 ± 10.31 µm (0.70%) at 8.0 mm. No correlations were observed between changes in CV and CT and refractive fluctuation between 1 month and 6 months postoperatively.

Conclusions

The corneal profile displayed a less oblate shift on the anterior surface; however, the posterior surface showed a slight backward shift during the postoperative period. The CV and CT steadily increased after surgery and mainly within the operative zones. Refraction remained stable postoperatively and was not affected by the corneal remodeling.

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Title: Corneal remodeling and spatial profiles following small incision lenticule extraction
Authors: Lin Zhang
Yan Wang
Wei Zhao
Wenbo Cheng
Tong Cui
Publication date: 01-08-2019
Publisher: Springer Netherlands
Published in: International Ophthalmology / Issue 8/2019
Print ISSN: 0165-5701
Electronic ISSN: 1573-2630
DOI: https://doi.org/10.1007/s10792-018-1010-3

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Springer Medicine

Corneal remodeling and spatial profiles following small incision lenticule extraction

Abstract

Purpose

Materials and methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Materials and methods

Results

Conclusions

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