18 results match your criteria Myopia Intracorneal Rings

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Complications and Explantation Reasons in Intracorneal Ring Segments (ICRS) Implantation: A Systematic Review.

J Refract Surg 2019 Nov;35(11):740-747

Purpose: To review the intraoperative and postoperative complications after intracorneal ring segment implantation and to report the explantation rate among the available scientific literature.

Methods: Three different databases (PubMed, Web of Science, and Scopus) were assessed from January 1995 to June 2019. The keywords used were: ring, rings, ICRS (intracorneal ring segments), segment, segments or Intacs, complication, explantation, explanted, retired, and removal. Read More

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November 2019

Template-based methodology for the simulation of intracorneal segment ring implantation in human corneas.

Biomech Model Mechanobiol 2018 Aug 21;17(4):923-938. Epub 2018 Mar 21.

Applied Mechanics and Bioengineering (AMB); Aragón Institute for Engineering Research(i3A), University of Zaragoza, Zaragoza, Spain.

Keratoconus is an idiopathic, non-inflammatory and degenerative corneal disease characterised by a loss of the organisation in the corneal collagen fibrils. As a result, keratoconic corneas present a localised thinning and conical protrusion with irregular astigmatism and high myopia that worsen visual acuity. Intracorneal ring segments (ICRSs) are used in clinic to regularise the corneal surface and to prevent the disease from progressing. Read More

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Late extrusion of intrastromal corneal ring segments: A report of two cases.

Am J Ophthalmol Case Rep 2017 Dec 6;8:67-70. Epub 2017 Oct 6.

Cornea Service, Department of Ophthalmology, University of California San Francisco, San Francisco, CA, USA.

Purpose: To report two cases of patients with late extrusion following uneventful implantation of intrastromal corneal ring segments (ICRS) for myopia.

Observations: Two patients with previously implanted ICRS for low myopia presented with spontaneous onset of extrusion of their ICRS, one at 7 years post-operatively and the other at 17 and 20 years. Both cases underwent explantation and maintained excellent best-corrected visual acuity. Read More

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December 2017

Prevention of Iatrogenic Keratectasia.

C J Rapuano

Klin Monbl Augenheilkd 2016 Jun 17;233(6):695-700. Epub 2016 Jun 17.

Cornea Service, Wills Eye Hospital, 840 Walnut Street, suite 920, 19107 Philadelphia, Pennsylvania, United States.

Iatrogenic corneal ectasia is a rare but devastating complication after refractive surgery. While its incidence appears to be declining, it has not been eliminated. Its cause is probably related to a combination of an intrinsic predisposition to ectasia and an additional anatomical destabilising effect from the refractive surgery. Read More

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Corneal Cross-Linking: An Example of Photoinduced Polymerization as a Treatment Modality in Keratoconus.

Polim Med 2016 Jan-Jun;46(1):89-94

Department and Clinic of Ophthalmology, Wroclaw Medical University, Wroclaw, Poland.

The cornea is one of the principal refractive elements in the human eye and plays a crucial role in the process of vision. Keratoconus is the most common corneal dystrophy, found mostly among young adults. It is characterized by a reduced number of collagen cross-links in the corneal stroma, resulting in reduced biomechanical stability and an abnormal shape of the cornea. Read More

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Biomechanics of Corneal Ring Implants.

Albert Daxer

Cornea 2015 Nov;34(11):1493-8

*Gutsehen Eye Center, Ybbs, Austria; and †Department of Ophthalmology, Medical University of Innsbruck, Innsbruck, Austria.

Purpose: To evaluate the biomechanics of corneal ring implants by providing a related mathematical theory and biomechanical model for the treatment of myopia and keratoconus.

Methods: The spherical dome model considers the inhomogeneity of the tunica of the eye, dimensions of the cornea, lamellar structure of the corneal stroma, and asphericity of the cornea. It is used in this study for calculating a strengthening factor sf for the characterization of different ring-shaped corneal implant designs. Read More

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November 2015

[Correction of irregular astigmatism with intracorneal ring segments].

J Fr Ophtalmol 2012 Mar 28;35(3):212-9. Epub 2012 Feb 28.

Service d'ophtalmologie, centre de référence national du Kératocône, centre Xavier-François-Michelet, site Pellegrin, CHU de Bordeaux, place Amélie-Raba-Léon, 33000 Bordeaux, France.

Management of irregular astigmatism with intracorneal rings segments is an intrastromal additive technique developed initially for myopia but eventually popularized for keratoconus and post LASIK ectasia. ICR's are indicated for rigid contact lens intolerance, as an alternative to corneal transplantation. The mechanism of action is complex and involves biomechanical changes leading to a centering and a flattening of the ectasia. Read More

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Intracorneal ring segments in ectatic corneal disease - a review.

Clin Exp Ophthalmol 2010 Mar;38(2):154-67

Vissum/Instituto Oftalmológico de Alicante, Alicante, Spain.

The purpose of this review is to collect and summarize all the scientific literature regarding the use of intracorneal ring segments (ICRS) in corneal ectatic disease. These implants, initially designed to correct myopia in normal eyes, are implanted in the deep corneal stroma with the aim of achieving modifications to the corneal curvature and subsequently refractive adjustments. Colin et al. Read More

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Bioptics: where do things stand?

Curr Opin Ophthalmol 2006 Aug;17(4):399-405

Ophthalmic Department, Casa di Cura Rugani, Siena, Italy.

Purpose Of Review: Bioptics treats complex refractive errors by combining refractive techniques with different mechanisms of action, usually using an intraocular implant (a phakic or pseudophakic intraocular lens) followed by a corneal procedure (laser ablation, intrastromal implant).

Recent Findings: In myopia and hyperopia, bioptics with phakic intraocular lenses or refractive lens exchange and subsequent excimer laser yields improved predictability and unchanged safety, compared with sole intraocular lens surgery. Complications are related mainly to intraocular lenses. Read More

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Are intracorneal rings still useful in refractive surgery?

José L Güell

Curr Opin Ophthalmol 2005 Aug;16(4):260-5

Department of Ophthalmology Autonoma, University of Barcelona, and Cornea and Refractive Surgery Unit, Instituto de Microcirugia, Ocular Munner, Barcelona, Spain.

Purpose Of Review: This article reviews the latest data published and presented at international meetings about the use of intracorneal ring segments in corneal and refractive surgery.

Recent Findings: The long-term data on intracorneal ring segments in the correction of low to moderate myopia indicate that they seem clearly comparable with laser in-situ keratomileusis, the most common refractive procedure worldwide. There is increasing interest in the use of intracorneal ring segments for the treatment of some complications after laser in-situ keratomileusis and for the control of some degrees of primary corneal ectatic disorders such as keratoconus and pellucid marginal degeneration. Read More

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[Intracorneal rings: why?].

J Cezón

Arch Soc Esp Oftalmol 2005 Jun;80(6):321-2

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Intracorneal rings to correct corneal ectasia after laser in situ keratomileusis.

J Cataract Refract Surg 2002 Sep;28(9):1568-74

Refractive Surgery and Cornea Unit, Alicante Institute of Ophthalmology, and Miguel Hernández University School of Medicine, Alicante, Spain.

Purpose: To evaluate the potential of using intrastromal corneal ring technology (Intacs, KeraVision) to correct posterior ectasia after laser in situ keratomileusis (LASIK) for myopia.

Setting: Department of Cornea and Refractive Surgery, Instituto Oftalmológico de Alicante, and Miguel Hernández University School of Medicine, Alicante, Spain.

Methods: In this prospective noncomparative intervention case series, Intacs segments were implanted in 3 eyes that developed posterior ectasia after myopic LASIK with clear central corneas. Read More

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September 2002

U.S. trends in refractive surgery: 2001 International Society of Refractive Surgery Survey.

J Refract Surg 2002 Mar-Apr;18(2):185-8

Purpose: To determine the trends in refractive surgery in the United States in 2001.

Methods: The 980 U.S. Read More

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Laser in situ keratomileusis after intracorneal rings. Report of 5 cases.

J Cataract Refract Surg 2000 Dec;26(12):1733-41

Minnesota Eye Laser and Surgery Centers, Minneapolis, MN, USA.

Purpose: To examine the results of laser in situ keratomileusis (LASIK) after removal of intracorneal ring (ICR) segments.

Setting: Active refractive surgery practice.

Methods: The effect of ICR (0. Read More

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December 2000

The intrastromal corneal ring in clinical refractive surgery: reference to results in rabbit eyes.

Graefes Arch Clin Exp Ophthalmol 2000 Jun;238(6):465-71

Department of Ophthalmology, Charité Medical Faculty , Humboldt University Berlin, Germany.

Background: The intrastromal corneal ring (ISR) is a refractive device recently introduced for clinical application that is implanted in the mid-peripheral corneal stroma in order to correct myopia without invasion of the central optical zone. First clinical results of intracorneal ring segment implantation were published recently. These results reveal striking similarities to our own experimental data, only briefly published up to now. Read More

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[Fluctuations in uncorrected visual acuity after refractive surgery using intra-stromal corneal rings].

J Fr Ophtalmol 1999 Apr;22(3):335-8

Centre Jean Abadie, Service d'Ophtalmologie, Bordeaux.

Purpose: Refractive surgery is meant to provide early stable and good uncorrected visual acuity. Our main concern in this study was to take special interest in fluctuation in uncorrected acuity within the first three months after implantation of Schanzlin intracorneal ring segments (ICRS) produced by Keravision.

Patients And Methods: Ten eyes in 6 patients underwent implantation of 2 intrastromal corneal segments for myopias ranging from -1. Read More

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[Diurnal variations of refraction and keratometry after intracorneal rings].

J Fr Ophtalmol 1999 Mar;22(2):169-75

Centre d'Ophtalmologie, Clinique Monticelli, Marseille.

Unlabelled: Within a European evaluation, we participated in the study of ICRS on low myopia. During the period of observation, subjective refraction variations in the day were underlined. This phenomenon remains to be specified. Read More

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Model for deriving the optical performance of the myopic eye corrected with an intracorneal ring.

J Refract Surg 1995 Jul-Aug;11(4):248-52

Department of Vision Sciences, Glasgow Caledonian University, Scotland.

Background: The intracorneal ring has been advanced as a mechanical device for the correction of myopia. The device may reduce refractive error, but the effect on the overall optical performance of the eye has been neglected. This paper addresses this issue by presenting mathematical models that will predict the effect of the intracorneal ring on refractive error, corneal asphericity, and the spherical aberration of the eye. Read More

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January 1996
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