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. 2018 May 18;11(5):802-806.
doi: 10.18240/ijo.2018.05.14. eCollection 2018.

Clinical outcomes after implantation of a new intrastromal corneal ring with 140-degree of arc in patients with corneal ectasia

Jordana Sandes  1 , Larissa R S Stival  1 , Marcos Pereira de Ávila  1 , Paulo Ferrara  2 , Guilherme Ferrara  2 , Leopoldo Magacho  1 , Luana P N Araújo  3 , Leonardo Torquetti  4
Affiliations

Clinical outcomes after implantation of a new intrastromal corneal ring with 140-degree of arc in patients with corneal ectasia

Jordana Sandes et al. Int J Ophthalmol. .

Abstract

Aim: To evaluate the clinical and tomographic outcomes after implantation of a new intrastromal corneal ring segment (ICRS) with 140-degrees of arc in eyes with corneal ectasia.

Methods: We evaluated patients with corneal ectasia implanted with Ferrara 140° ICRS from April 2010 to February 2015. Outcome measures included preoperative and postoperative corrected distance visual acuity (CDVA), keratometry simulated (K) reading, tomographic astigmatism and asphericity. All patients were evaluated using the Pentacam Scheimpflug system.

Results: The study evaluated 58 eyes. The mean follow-up was 16.81±10.8mo. The CDVA (logMAR) improved from 0.5±0.20 (20/60) to 0.3±0.21 (20/40) (P<0.01). The average K reduced from 49.87±7.01 to 47.34±4.90 D (P<0.01). The asphericity changed from -0.60±0.86 to -0.23±0.67 D (P<0.01). The mean preoperative tomographic astigmatism decreased from -8.0±3.45 to -4.53±2.52 D (P<0.01).

Conclusion: The new ICRS model with 140-degrees of arc effectively improve the visual acuity and reduce the high astigmatism usually found in patients with corneal ectasia.

Keywords: corneal ectasia; intrastromal corneal ring segment; keratoconus.

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Figures

Figure 1
Figure 1. Pre- and post-operative K1, K2 and Km (A), tomographic astigmatism (B), CDVA (logMAR) (C) in the 3 groups.
Figure 2
Figure 2. Doubled-angle plot of the pre- and post-operative keratometric cylinder at the corneal plane
A: The preoperative centroid of the keratometric astigmatism was 1.22 D at 23.17°±6.39°, ρ=0.77; B: The postoperative centroid of the keratometric astigmatism was 0.68 D at 22.37°±3.91°, ρ=0.74; C: The relationship between the preoperative and postoperative keratometric astigmatism. There was a significant reduction in the keratometric astigmatism.
See this image and copyright information in PMC

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