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ring segment cornea

Leonardo Torquetti, Carlos Arce, Jesús Merayo-Lloves, Guilherme Ferrara, Paulo Ferrara, Brenno Signorelli, Armando Signorelli
AIM: To evaluate corneal parameters measured with a dual Scheimpflug analyzer in keratoconus patients implanted with intrastromal corneal ring segments (ICRS). METHODS: Fifty eyes of 40 keratoconus patients had Ferrara ICRS implantation from November 2010 to April 2014. Uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), refraction, keratometry, asphericity, elevation, pachymetry, root mean square (RMS), spherical aberration and coma were studied...
2016: International Journal of Ophthalmology
B Seitz, N Szentmáry, A Langenbucher, T Hager, A Viestenz, E Janunts, M El-Husseiny
For patients with keratoconus, rigid gas-permeable contact lenses are the first line correction method and allow good visual acuity for quite some time. In severe stages of the disease with major cone-shaped protrusion of the cornea, even specially designed keratoconus contact lenses are no longer tolerated. If there are contraindications for intrastromal ring segments, corneal transplantation typically has a very good prognosis. In patients with advanced keratoconus - especially after corneal hydrops due to rupture of Descemet's membrane - penetrating keratoplasty (PKP) is still the first line surgical method...
June 2016: Klinische Monatsblätter Für Augenheilkunde
M El-Husseiny, L Daas, A Langenbucher, B Seitz
BACKGROUND AND PURPOSE: Implantation of intracorneal ring segments (ICRS) using a femtosecond laser is a minimally invasive procedure which represents a reliable option to widen the spectrum of the stage-related therapy of keratoconus in patients with contact lens intolerance, or with post-LASIK-keratectasia or pellucide marginale degeneration (PMD). METHODS: From August 2011 to September 2015, 84 eyes of 69 patients were implanted with ICRS. 74 eyes were implanted with INTACS-SK (Intacs, Addition Technology, Inc...
June 2016: Klinische Monatsblätter Für Augenheilkunde
Ralitsa T Loewen, Eric N Brown, Pritha Roy, Joel S Schuman, Ian A Sigal, Nils A Loewen
PURPOSE: To visualize and quantify conventional outflow directly in its anatomic location. METHODS: We obtained fluorescein canalograms in six porcine whole eyes and six porcine anterior segment cultures. Eyes were perfused with a constant pressure of 15 mmHg using media containing 0.017 mg/ml fluorescein. Flow patterns were visualized using a stereo dissecting microscope equipped for fluorescent imaging. Images were captured every 30 seconds for 20 minutes for time lapse analysis...
2016: PloS One
Rafic Antonios, Ali Dirani, Ali Fadlallah, Elias Chelala, Adib Hamadeh, Elias Jarade
This case report describes a 15-year-old male with allergic conjunctivitis and keratoconus, who underwent uneventful intra-corneal ring segment (ICRS) implantation and corneal collagen cross-linking (CXL) in the right eye. During the follow-up periods, the patient was noted to have several episodes of allergic conjunctivitis that were treated accordingly. At the 2 years postoperatively, he presented with another episode of allergic conjunctivitis and progression of keratoconus was suspected on topography. However, the patient was lost to follow-up, until he presented with acute hydrops at 3 years postoperatively...
January 2016: Middle East African Journal of Ophthalmology
Lucía Ibares-Frías, Patricia Gallego, Roberto Cantalapiedra-Rodriguez, Jesús Merayo-Lloves, María Carmen Martínez-García
PURPOSE: The aim was to evaluate the reversibility of the clinical and histological changes induced in the corneas of an animal model after removing an intracorneal ring segment (ICRS). METHODS: Surgery for this study was performed in 38 eyes of an experimental animal model (Gallus domesticus) for ICRS surgery (Ferrara technique). The animals without complications were randomized to two groups; in all of them, 1 segment was implanted in each eye and later removed at different times (1 and 3 months after implantation)...
September 2016: Current Eye Research
Maged Alnawaiseh, Lars Zumhagen, Gabriele Wirths, Maria Eveslage, Nicole Eter, André Rosentreter
PURPOSE: The aim of the study was to quantify Scheimpflug corneal densitometry in patients with Fuchs endothelial dystrophy (FED). METHODS: In this study, we retrospectively reviewed the charts and anterior segment data of 49 patients with FED before posterior lamellar keratoplasty and 51 healthy controls. The patients were examined using the Scheimpflug-based Oculus Pentacam. Central corneal thickness (CCT), ring-averaged (on a circle of 2, 2.4-10 mm diameter) noncentral corneal thickness, and densitometry data in different corneal layers and in different annuli were extracted and analyzed...
March 2016: Cornea
Albert Daxer
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...
November 2015: Cornea
M A Lago, M J Rupérez, C Monserrat, F Martínez-Martínez, S Martínez-Sanchis, E Larra, M A Díez-Ajenjo, C Peris-Martínez
PURPOSE: The purpose of this study was the simulation of the implantation of intrastromal corneal-ring segments for patients with keratoconus. The aim of the study was the prediction of the corneal curvature recovery after this intervention. METHODS: Seven patients with keratoconus diagnosed and treated by implantation of intrastromal corneal-ring segments were enrolled in the study. The 3D geometry of the cornea of each patient was obtained from its specific topography and a hyperelastic model was assumed to characterize its mechanical behavior...
November 2015: Journal of the Mechanical Behavior of Biomedical Materials
Yuko Shikamura, Yoshiko Yamazaki, Toru Matsunaga, Takao Sato, Akira Ohtori, Kakuji Tojo
PURPOSE: To investigate the efficacy of a topical hydrogel ring for drug delivery to the posterior segment of the rabbit eye. MATERIALS AND METHODS: Novel hydrogel corneal lenses (CL), scleral/corneal lenses (S/CL), and rings were prepared using poly(hydroxyethyl methacrylate). The devices were immersed in 0.3% ofloxacin ophthalmic solution (OOS) to homogeneously distribute the drug throughout the hydrogel. The medicated CL, S/CL, Ring 1 (standard ring), or Ring 2 (shape-optimized ring) was applied to the surface of the cornea, cornea/bulbar conjunctiva, or bulbar conjunctiva of albino rabbits, respectively...
May 2016: Current Eye Research
Griffin J Jardine, Jeffrey D Holiman, Joshua D Galloway, Christopher G Stoeger, Winston D Chamberlain
PURPOSE: The aim of this study was to investigate the use of a femtosecond laser (FL) in the eye bank preparation of corneas for Descemet membrane (DM) automated endothelial keratoplasty (fDMAEK) and to compare endothelial cell death in graft preparations between fDMAEK, Descemet stripping endothelial keratoplasty (DSEK), and DM endothelial keratoplasty (DMEK). METHODS: Twenty cadaveric tissues were used to test the fDMAEK method. A 9.0-mm-diameter lamellar incision was made using the FL with a 6...
July 2015: Cornea
Mohammed Ziaei, Allon Barsam, Neda Shamie, David Vroman, Terry Kim, Eric D Donnenfeld, Edward J Holland, John Kanellopoulos, Francis S Mah, J Bradley Randleman, Sheraz Daya, Jose Güell
UNLABELLED: Corneal ectasia is a progressive, degenerative, and noninflammatory thinning disorder of the cornea. Recently developed corneal reshaping techniques have expanded the treatment armamentarium available to the corneal specialist by offering effective nontransplant options. This review summarizes the current evidence base for corneal collagen crosslinking, topography-guided photorefractive keratectomy, and intrastromal corneal ring segment implantation for the treatment of corneal ectasia by analyzing the data published between the years 2000 and 2014...
April 2015: Journal of Cataract and Refractive Surgery
Paula Arribas-Pardo, Carmen Mendez-Hernandez, Ricardo Cuiña-Sardiña, Cristina Fernandez-Perez, David Diaz-Valle, Julian Garcia-Feijoo
PURPOSE: The aim of this study was to compare intraocular pressure (IOP) measurements in patients with ectatic corneas after intrastromal corneal ring segment (ICRS) implantation using the Rebound tonometers (RBTs) Icare and Icare Pro, compared with Goldmann applanation tonometry (GAT) and to assess the influence of central corneal thickness (CCT), corneal curvature (CC), and corneal astigmatism (CA) on IOP. METHODS: This prospective cross-sectional study consecutively included 60 eyes of 60 patients with corneal ectasia having ICRS for at least 6 months from January 2011 to December 2013...
May 2015: Cornea
Elise G Kramer, Edward L Boshnick
OBJECTIVE: This case report aims to explore the use of scleral lenses for the treatment of ocular and visual complications in an adult patient presenting with post-LASIK (Laser-Assisted in situ Keratomileusis) ectasia in both eyes with cross-linking in the right eye and intrastromal corneal ring segments (ICRS; Intacs, Addition Technology, Fremont, CA) in the left eye. METHODS: Following a comprehensive eye exam and specific testing for contact lens fitting, scleral lenses were fitted with success in both eyes and dispensed...
August 2015: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
Lucía Ibares-Frías, Patricia Gallego, Roberto Cantalapiedra-Rodríguez, María Cruz Valsero, Santiago Mar, Jesús Merayo-Lloves, María Carmen Martínez-García
PURPOSE: To evaluate corneal wound healing in the hen animal model after additive surgery with an intracorneal ring segment (ICRS). METHODS: We implanted one ICRS in each eye of 76 hens. In control group 1 (n = 22 hens), the stromal channel was prepared but no ICRS was inserted. In control group 2 (n = 2 hens), no surgery was performed. Animals were randomly separated into groups and euthanized after clinical follow-up of 4 and 12 hours, 1, 2, 3, and 7 days, and 1, 2, 3, 4, and 6 months...
July 2015: Graefe's Archive for Clinical and Experimental Ophthalmology
Rohit Shetty, Luci Kaweri, Natasha Pahuja, Harsha Nagaraja, Kareeshma Wadia, Chaitra Jayadev, Rudy Nuijts, Vishal Arora
Keratoconus is a slowly progressive, noninflammatory ectatic corneal disease characterized by changes in corneal collagen structure and organization. Though the etiology remains unknown, novel techniques are continuously emerging for the diagnosis and management of the disease. Demographical parameters are known to affect the rate of progression of the disease. Common methods of vision correction for keratoconus range from spectacles and rigid gas-permeable contact lenses to other specialized lenses such as piggyback, Rose-K or Boston scleral lenses...
January 2015: Indian Journal of Ophthalmology
Khosrow Jadidi, Seyed Aliasghar Mosavi, Farhad Nejat, Mostafa Naderi, Leila Janani, Sara Serahati
We evaluate the efficacy and safety of Keraring 355° intrastromal corneal ring segment (ICRS) implantation aided by PocketMaker microkeratome for the correction of keratoconus. Patients underwent ICRS insertion using mechanical dissection with PocketMaker microkeratome and completed 6 months of follow-up. Uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA), refraction, topographic findings, safety, efficacy index, and adverse events were reported for six months postoperatively...
2015: Journal of Ophthalmology
Hassan Hashemi, Kazem Amanzadeh, Mohammad Miraftab, Soheila Asgari
OBJECTIVE: To determine visual rehabilitation in patients with keratoconus who received femtosecond-assisted intrastromal corneal single-segment ring implantation. METHODS: This prospective study was conducted on 62 eyes of 45 patients with keratoconus who received single-segment Intacs. The FS200 femtosecond laser was used for tunnel creation. Patients were examined for astigmatism, uncorrected visual acuity (UCVA), best-corrected visual acuity (BCVA), and manifest refraction spherical equivalent (MRSE) before the operation and 1, 6, and 12 months after operation...
May 2015: Eye & Contact Lens
Hassan Hashemi, Ali Gholaminejad, Kazem Amanzadeh, Maryam Hashemi, Mehdi Khabazkhoob
The objective of the present study was to compare single segment and double segment INTACS rings in the treatment of post-LASIK ectasia. In this interventional study, 26 eyes with post-LASIK ectasia were assessed. Ectasia was defined as progressive myopia regardless of astigmatism, along with topographic evidence of inferior steepening of the cornea after LASIK. We excluded those with a history of intraocular surgery, certain eye conditions, and immune disorders, as well as monocular, pregnant and lactating patients...
2014: Acta Medica Iranica
Haris Sideroudi, Georgios Labiris, Amaia Soto-Beobide, Georgios Voyiatzis, Athanassios Chrissanthopoulos, Vassilios Kozobolis
PURPOSE: To assess the potential impact of corneal crosslinking treatment (365 nm ultraviolet (UV)A irradiation with riboflavin) on the material properties of Intracorneal Rings Segments (ICRS). MATERIALS AND METHODS: Material properties were studied using FT-IR spectroscopy and UV-Vis spectroscopy. Rings were examined: (1) after installation of riboflavin solution, (2) after irradiation with UV-A light and (3) after instillation of riboflavin solution followed by instillation and coeval irradiation...
May 2015: Current Eye Research
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