Comparative evaluation of visual outcomes and corneal asphericity after laser-assisted in situ keratomileusis with the six-dimension Amaris excimer laser system

JunJie Piao, Ying-Jun Li, Woong-Joo Whang, Mihyun Choi, Min Ji Kang, Jee Hye Lee, Geunyoung Yoon, Choun-Ki Joo, JunJie Piao, Ying-Jun Li, Woong-Joo Whang, Mihyun Choi, Min Ji Kang, Jee Hye Lee, Geunyoung Yoon, Choun-Ki Joo

Abstract

Purpose: To compare the visual and refractive outcomes after laser-assisted in situ keratomileusis (LASIK) surgery for correction of myopia or myopic astigmatism using a six-dimensional Amaris excimer laser.

Methods: In this retrospective cohort study, we enrolled 47 eyes of 28 patients (age: 19-36 years) with myopia or myopic astigmatism. We used the Custom Ablation Manager protocol and performed ablations with the SCHWIND AMARIS system. LASIK flaps were cut with an iFS Advanced Femtosecond Laser. Mean static (SCC) and dynamic cyclotorsion (DCC) were evaluated. Visual and refractive outcomes were evaluated during 6 months' follow-up. Corneal asphericity (Q-value) was analyzed at 4 months postoperatively.

Results: The spherical equivalent (SE) reduction was statistically significant reduce 1 day after refractive surgery (P < 0.001), with no additional significant changes during follow-up (P = 0.854). SCC registration rates were 81% in the Aberration-Free mode (AF) and 90% in the Corneal Wavefront mode (CW). SCC measurements were within ± 5 degrees in 57% (AF) and 68% (CW) of eyes. Mean DCC was within ± 1 degree in 96% (AF) or 95% (CW) of cases. At 6 months, the uncorrected distance visual acuity was 20/25 or better in all eyes. At last follow-up, both steep and flat keratometry values had significantly flattened in both groups (P < 0.001). Corneal asphericity also increased significantly during the postoperative period for an 8-mm corneal diameter (P < 0.001).

Conclusions: LASIK for myopia or myopic compound astigmatism correction using the six-dimensional AMARIS 750S excimer laser is safe, effective, and predictable. Postoperative corneal asphericity can be analyzed by linear regression to predict the changes in postoperative corneal asphericity with this approach.

Conflict of interest statement

The authors have declared that no competing interests exist.

Figures

Fig 1. Distribution of the measured static…
Fig 1. Distribution of the measured static cyclotorsion (SCC) from upright to supine position.
Fig 2. Distribution of the measured average…
Fig 2. Distribution of the measured average dynamic cyclotorsion (DCC) during the ablation procedures.
Fig 3. Stability of mean refractive spherical…
Fig 3. Stability of mean refractive spherical equivalent (MRSE) between preoperative and various postoperative and various postoperative visits between the two groups.
Fig 4. Distribution of the postoperative spherical…
Fig 4. Distribution of the postoperative spherical equivalent (predictability) in the sample of myopia or myopic compound astigmatism eye undergoing laser-assisted in situ keratomileusis with six-dimensional Amaris laser platform.
Fig 5. Distribution of uncorrected distance visual…
Fig 5. Distribution of uncorrected distance visual acuity (UDVA) (20/20 or better) between the two groups at 6 months postoperatively.

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