Erratum to “Streptococcus vestibularis atypical infectious keratits after intracorneal ring segment implantation”

Abstract Background To compare the results of single versus double intracorneal ring segment (ICRS) (KeraRing) implantation in keratoconus with respect to different cone locations. Methods Twenty-two eyes of 18 patients with totally asymmetric cones (20–80% or 0–100% distribution along steep axis) were implanted with single ICRS (Group 1), 38 eyes of 32 patients with central or partially asymmetric cones (50–50% or 40–60% distribution along steep axis) were implanted with double ICRS (Group 2), at a depth of 80% of the site of implantation, in channels created with femtosecond laser device. All patients had uncorrected and corrected distance visual acuities (UDVA and CDVA, respectively) of ≤ 0.3 Snellen lines. Results In both groups, patients had median UDVA and CDVA gain of 3 Snellen lines (P > 0.05). Postoperative improvement in indices of vertical asymmetry and height decentration in Group 1; simulated keratometry, corneal astigmatism and anterior corneal asphericity values in Group 2 were greater (P < 0.05). A total of 10 eyes (45.5%) in Group 1 were recommended double ring implantation by the manufacturer’s nomogram, but underwent single ICRS implantation and achieved visual, refractive, tomographic outcomes comparable to that in Group 2, although corneal cylindrical correction was less and final topographic astigmatism was greater. Conclusion Double ICRS implantation seems to be superior in terms of keratometry, corneal astigmatism and anterior corneal asphericity improvement. Single ICRS implantation in totally asymmetric cones seems to provide satisfactory visual, refractive and tomographic results, similar to double ICRS implantation in central and partially asymmetric cones, by inducing central shift of the cone.

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Intracorneal circular ring implant with femtosecond laser: Pocket versus tunnel

European Journal of Ophthalmology ◽

10.1177/1120672121994729 ◽

2021 ◽

pp. 112067212199472

Author(s):

Luis Izquierdo ◽

Ana M Rodríguez ◽

Ramón A Sarquis ◽

Diego Altamirano ◽

Maria A Henriquez

Keyword(s):

Visual Acuity ◽

Femtosecond Laser ◽

Randomized Study ◽

Circular Ring ◽

Continuous Ring ◽

Refractive Outcomes ◽

Scheimpflug Imaging ◽

Ring Segment ◽

Intracorneal Ring Segment ◽

Student’S T

Purpose: To evaluate and compare visual and refractive outcomes after implantation of the intracorneal continuous ring 360° arc (ICCR) versus the intracorneal ring segment 340° arc (ICRS) using femtosecond laser for central keratoconus. Setting: Research Department, Oftalmosalud, Instituto de Ojos, Lima, Peru. Methods: Randomized study that included 40 eyes of 32 patients diagnosed with central keratoconus between November 2014 and March 2015. Twenty eyes had an implantation of ICCR (MyoRing, Dioptex GmbH, Austria) through an intrastromal pocket and 20 eyes had an implantation of ICRS (Keraring, Mediphacos, Brazil) through an intrastromal tunnel. Both procedures were performed with a femtosecond laser (LDV Z6 model, Ziemer Ophthalmic Systems AG). Visual acuity (VA), refraction, and Scheimpflug imaging analysis were performed pre- and postoperatively at 1 month and 1 year. Comparisons of means were performed using the Student’s t-test. Results: At 1 year, uncorrected VA improved 0.77 LogMAR ( p < 0.001) in the ICCR group and 0.79 LogMAR ( p = 0.01) in the ICRS group; mean sphere improvement was 5.13 Diopters (D) in the ICCR group and 6.27 D in the ICRS group ( p < 0.001 both); mean Steeper Keratometry improvement was 4.24 D in the ICCR group and 5.53 D in the ICRS group ( p < 0.001 both). In the ICCR group, mean decrease in the pachymetry at the thinnest point of the cornea was 32.16 µm ( p = 0.01), and in the ICRS group, mean increase was 4.2 µm at 1 year ( p = 0.61). Conclusion: Intracorneal continuous ring 360° arc (ICCR) and intracorneal ring segment 340° (ICRS) are effective treatments for central keratoconus. No significant differences between rings were found on visual acuity, refraction, and keratometry improvement.

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New Technique of Femtosecond Laser-Assisted Intracorneal Ring Segment Implantation

Cornea ◽

10.1097/ico.0000000000001215 ◽

2017 ◽

Vol 36 (7) ◽

pp. 884-888

Author(s):

Luis Izquierdo ◽

Alejandra Orozco ◽

Maria A. Henriquez

Keyword(s):

Femtosecond Laser ◽

New Technique ◽

Ring Segment ◽

Intracorneal Ring Segment

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Spontaneous expulsion of intracorneal ring segment in pellucid marginal degeneration: A case report

Journal Français d Ophtalmologie ◽

10.1016/j.jfo.2020.03.013 ◽

2021 ◽

Vol 44 (1) ◽

pp. e47-e49

Author(s):

R. Moskwa ◽

P. Rolland le Moal ◽

M. Sot ◽

J. Francois ◽

J.-C. Vermion ◽

...

Keyword(s):

Case Report ◽

Spontaneous Expulsion ◽

Ring Segment ◽

Intracorneal Ring Segment

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Incidence and associations of intracorneal ring segment explantation

Journal of Cataract & Refractive Surgery ◽

10.1016/j.jcrs.2018.09.021 ◽

2019 ◽

Vol 45 (2) ◽

pp. 153-158 ◽

Cited By ~ 5

Author(s):

Natalie Nguyen ◽

John D. Gelles ◽

Steven A. Greenstein ◽

Peter S. Hersh

Keyword(s):

Ring Segment ◽

Intracorneal Ring Segment

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Quantitative OCT-Based Longitudinal Evaluation of Intracorneal Ring Segment Implantation in Keratoconus

Investigative Opthalmology & Visual Science ◽

10.1167/iovs.13-12401 ◽

2013 ◽

Vol 54 (9) ◽

pp. 6040 ◽

Cited By ~ 13

Author(s):

Pablo Pérez-Merino ◽

Sergio Ortiz ◽

Nicolas Alejandre ◽

Ignacio Jiménez-Alfaro ◽

Susana Marcos

Keyword(s):

Longitudinal Evaluation ◽

Ring Segment ◽

Intracorneal Ring Segment

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Long-term Stability of Ectasia in a Young Patient with Asymmetric Keratoconus

International Journal of Keratoconus and Ectatic Corneal Diseases ◽

10.5005/jp-journals-10025-1102 ◽

2015 ◽

Vol 4 (2) ◽

pp. 66-68

Author(s):

Rosane de Oliveira Corrêa ◽

Ana Laura Caiado Canedo ◽

Rozalia Beildeck ◽

Marcella Quaresma Salomão ◽

Penelope Burle de Politis

Keyword(s):

Visual Acuity ◽

Young Patient ◽

Distance Visual Acuity ◽

Long Term Stability ◽

Uncorrected Distance Visual Acuity ◽

Manifest Refraction ◽

Corrected Distance Visual Acuity ◽

Ring Segment ◽

Intracorneal Ring Segment ◽

The Right

ABSTRACT Purpose To report the clinical course of a typical young patient presenting with asymmetric keratoconus (KC), that demonstrates that stabilization of the ectatic process is possible without cross-linking (CXL) procedure. Methods Case report and review of the literature. Results A 17-year-old male patient was referred due to the diagnosis of keratoconus. Patient complained of loss of vision in the left eye (OS). Uncorrected distance visual acuity (UDVA) was 20/25+ in the right eye (OD) and 20/80 in the left eye; wavefront-assisted manifest refraction gave best corrected distance visual acuity (CDVA) of 20/20 in OD and 20/40 in OS. The diagnosis of keratoconus was confirmed with Placido disk-based topography (Oculus Keratograph 4), and Pentacam HR corneal tomography (Oculus Optikgeräte GmbH, Wetzlar, Germany). Femtosecond laser-assisted intracorneal ring segment (ICRS) implantation was performed in the left eye and treatment for allergy was prescribed for both eyes, along with patient education and advice not to rub the eyes. After 3 months, significant improvement was observed on UDVA (20/30) and CDVA (20/20) in the left eye. Topometric and tomographic stability of ectasia was observed in the right eye in a 4-year follow-up. Conclusion Intracorneal ring segment caused significant regularization of the corneal shape and improvement on visual acuity. Ectasia stability was achieved with no need for CXL, despite the patient's young age. This case raises the point that the indication of CXL for every keratoconic patient should be reconsidered. How to cite this article de Oliveira Corrêa R, Canedo ALC, Beildeck R, Salomão MQ, de Politis PB, Ambrósio R Jr. Longterm Stability of Ectasia in a Young Patient with Asymmetric Keratoconus. Int J Kerat Ect Cor Dis 2015;4(2):66-68.

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