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. 2016 Mar 18;9(3):399-405.
doi: 10.18240/ijo.2016.03.13. eCollection 2016.

A comparable study of clinical and optical outcomes after 1.8, 2.0 mm microcoaxial and 3.0 mm coaxial cataract surgery

Yi-Bo Yu  1 , Ya-Nan Zhu  2 , Wei Wang  2 , Yi-Dong Zhang  2 , Yin-Hui Yu  2 , Ke Yao  1
Affiliations

A comparable study of clinical and optical outcomes after 1.8, 2.0 mm microcoaxial and 3.0 mm coaxial cataract surgery

Yi-Bo Yu et al. Int J Ophthalmol. .

Abstract

Aim: To evaluate the clinical and optical outcomes after clear corneal incision cataract surgery (CICS) with three different incision sizes (1.8, 2.0 and 3.0 mm).

Methods: Eyes of 150 patients with age-related cataract scheduled for coaxial cataract surgery were randomized to three groups: 1.8, 2.0, or 3.0 mm CICS. Intraoperative data and postoperative outcomes including surgically induced astigmatism (SIA), the corneal incision thickness, wavefront aberrations and modulation transfer function (MTF) of cornea were obtained.

Results: There were no significant differences among the three groups in demographic characteristics and intraoperative outcome. The 1.8 and 2.0 mm microincisions showed more satisfactory clinical outcomes than the 3.0 mm incision. The 1.8 mm incision showed significantly less SIA than the 2.0 mm incision until postoperative 1mo (P<0.05), but the difference was only 0.14-0.18 D. Combined with less increased incision thickness only at postoperative 1d (P=0.013), the 1.8 mm incision presented better uncorrected distance visual acuity (UCDVA) than the 2.0 mm incision only at 1d postoperatively (P=0.008). For higher-order aberrations and other Zernike coefficients, there were no significant differences between the 1.8 mm group and 2.0 mm group (P>0.05).

Conclusion: Converting from 3.0 mm CICS to 1.8 or 2.0 mm CICS result in better clinical and optical outcomes. However, when incision is 1.8 mm, the benefits from further reduction in size compared with 2.0 mm are limited. The necessity to reduce the incision size is to be deliberated.

Keywords: microsurgery; phacoemulsification; treatment outcome.

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Figures

Figure 1
Figure 1. The clinical and optical outcomes in each group
A: Comparison of SIA in the three groups at 1d, 1wk, 1 and 2mo after surgery; B, C: Comparison of UCDVA and CDVA among the three groups at 1d, 1wk, 1, and 2mo after surgery. D: Spatial frequency (cpd) of 0.5 MTF in the three groups at preoperative and postoperative 1d, 1wk, 1, and 2mo. Group I: 1.8 mm incision; Group II: 2.0 mm incision; Group III: 3.0 mm incision. aP<0.05 vs Group III; cP<0.05 vs Group II.
Figure 2
Figure 2. Anterior segment OCT images of clear corneal incision thickness observed at all visits after surgery
Images of 1.8, 2.0 and 3.0 mm showing the evolution of corneal incision thickness at postoperative 1d, 1wk, 1 and 2mo.
See this image and copyright information in PMC

References

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