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Eye, contact lenses, scleral lenses, cornea

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https://www.readbyqxmd.com/read/27768614/irregular-corneas-improve-visual-function-with-scleral-contact-lenses
#1
Beatriz de Luis Eguileor, Jaime Etxebarria Ecenarro, Alaitz Santamaria Carro, Raquel Feijoo Lera
OBJECTIVES: To assess visual function in patients with irregular cornea who do not tolerate gas permeable (GP) corneal contact lenses and are fitted with GP scleral contact lenses (Rose K2 XL). METHODS: In this prospective study, we analyzed 15 eyes of 15 patients who did not tolerate GP corneal contact lenses and were fitted with scleral contact lenses (Rose K2 XL). We assessed visual function using visual acuity and the visual function index (VF-14); we used the VF-14 as an indicator of patient satisfaction...
October 20, 2016: Eye & Contact Lens
https://www.readbyqxmd.com/read/27741084/modeling-corneal-oxygen-with-scleral-gas-permeable-lens-wear
#2
Vicente Compañ, Marcel Aguilella-Arzo, Timothy B Edrington, Barry A Weissman
PURPOSE: The main goal of this current work is to use an updated calculation paradigm, and updated boundary conditions, to provide theoretical guidelines to assist the clinician whose goal is to improve his or her scleral gas permeable (GP) contact lens wearing patients' anterior corneal oxygen supply. METHODS: Our model uses a variable value of corneal oxygen consumption developed through Monod equations that disallows negative oxygen tensions within the stroma to predict oxygen tension at the anterior corneal surface of scleral GP contact lens wearing eyes, and to describe oxygen tension and flux profiles, for various boundary conditions, through the lens, tears, and cornea...
November 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27541971/first-experience-with-the-icd-16-5-mini-scleral-lens-for-optic-and-therapeutic-purposes
#3
Cyrielle Suarez, Virginie Madariaga, Benoît Lepage, Marie Malecaze, Pierre Fournié, Vincent Soler, Stéphane Galiacy, René Mély, Myriam Cassagne, François Malecaze
OBJECTIVES: To evaluate the success rate, efficacy, and safety of the ICD 16.5 mini-scleral gas permeable (GP) contact lens. METHODS: This prospective study included referred consecutive patients with irregular corneas and severe ocular surface disease (OSD) in treatment failure. All patients were fitted with the ICD 16.5 mini-scleral GP lens. Even though we had some limited experience with scleral lenses, it was our first experience with the ICD 16.5 mini-scleral GP lens...
July 12, 2016: Eye & Contact Lens
https://www.readbyqxmd.com/read/27101746/quantitative-assessment-of-central-and-limbal-epithelium-after-long-term-wear-of-soft-contact-lenses-and-in-patients-with-dry-eyes-a-pilot-study
#4
R K Prakasam, B S Kowtharapu, K Falke, K Winter, D Diedrich, A Glass, A Jünemann, R F Guthoff, O Stachs
PurposeAnalysis of microstructural alterations of corneal and limbal epithelial cells in healthy human corneas and in other ocular conditions.Patients and methodsUnilateral eyes of three groups of subjects include healthy volunteers (G1, n=5), contact lens wearers (G2, n=5), and patients with dry eyes (G3, n=5) were studied. Imaging of basal (BC) and intermediate (IC) epithelial cells from central cornea (CC), corneal limbus (CL) and scleral limbus (SL) was obtained by in vivo confocal microscopy (IVCM). An appropriate image analysis algorithm was used to quantify morphometric parameters including mean cell area, compactness, solidity, major and minor diameter, and maximum boundary distance...
July 2016: Eye
https://www.readbyqxmd.com/read/26760584/hypoxic-corneal-changes-following-eight-hours-of-scleral-contact-lens-wear
#5
Stephen J Vincent, David Alonso-Caneiro, Michael J Collins, Alison Beanland, Linda Lam, Ching Chong Lim, Alyssa Loke, Nhi Nguyen
PURPOSE: To examine the change in corneal thickness and posterior curvature following 8 hours of miniscleral contact lens wear. METHODS: Scheimpflug imaging (Pentacam HR; Oculus) was captured before, and immediately following, 8 hours of miniscleral contact lens wear for 15 young (mean age 22 ± 3 years), healthy participants with normal corneae. Natural diurnal variations were considered by measuring baseline corneal changes obtained on a separate control day without contact lens wear...
March 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/26709983/post-lasik-visual-quality-with-a-corneoscleral-contact-lens-to-treat-irregular-corneas
#6
Esteban Porcar, Enrique España, Juan Carlos Montalt, Josefa Isabel Benlloch-Fornés, Cristina Peris-Martínez
OBJECTIVE: To evaluate the visual quality results of fitting a corneoscleral contact lens with multiaspheric geometry design (MAGD CScL) in subjects with irregular corneas after laser-assisted in situ keratomileusis (LASIK) surgery. METHODS: From a database of patients evaluated for scleral contact lenses, we identified those with irregular corneas and visual problems after they underwent LASIK surgery for correcting myopia. They manifested unsatisfactory visual quality with their current contact lenses or glasses...
December 24, 2015: Eye & Contact Lens
https://www.readbyqxmd.com/read/26604671/scleral-lens-for-keratoconus-technology-update
#7
REVIEW
Varsha M Rathi, Preeji S Mandathara, Mukesh Taneja, Srikanth Dumpati, Virender S Sangwan
Scleral lenses are large diameter lenses which rest over the sclera, unlike the conventional contact lenses which rest on the cornea. These lenses are fitted to not touch the cornea and there is a space created between the cornea and the lens. These lenses are inserted in the eyes after filling with sterile isotonic fluid. Generally, scleral contact lenses are used for high irregular astigmatism as seen in various corneal ectatic diseases such as keratoconus, pellucid marginal degeneration, or/and as liquid bandage in ocular surface disorders...
2015: Clinical Ophthalmology
https://www.readbyqxmd.com/read/26341076/complications-and-fitting-challenges-associated-with-scleral-contact-lenses-a-review
#8
REVIEW
Maria K Walker, Jan P Bergmanson, William L Miller, Jason D Marsack, Leah A Johnson
INTRODUCTION: The modern scleral contact lens (ScCL) has evolved from the very first contact lens fitted 128 years ago. Originally manufactured in glass and oxygen impermeable plastics, these lenses are available today in high Dk gas permeable materials that allow permeation of oxygen, reducing many of the complications that were seen with older generation ScCL. However, as with any new contact lens modality, the modern ScCL brings with it a new set of complications and fitting limitations...
April 2016: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/26058019/advances-in-scleral-lenses-for-refractive-surgery-complications
#9
REVIEW
Amy Parminder, Deborah S Jacobs
PURPOSE OF REVIEW: The last two decades have brought advances in materials and manufacturing of large diameter rigid gas-permeable contact lenses, and a greater appreciation of the role of scleral lenses for therapeutic indications. The purpose of this review is to provide an update on the use of rigid gas-permeable scleral lenses in the management of patients with complications after refractive surgery. RECENT FINDINGS: There are recent reports on clinical experience with specific scleral lens designs from single institutions in cohorts that include patients who have undergone refractive surgery...
July 2015: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/25865408/scleral-lens-influence-on-corneal-curvature-and-pachymetry-in-keratoconus-patients
#10
Nienke Soeters, Esther Simone Visser, Saskia M Imhof, Nayyirih G Tahzib
OBJECTIVES: To investigate the influence of full scleral lenses on corneal curvature and pachymetry in keratoconus patients. METHODS: In this intervention study, 20 eyes of 14 patients were measured by Scheimpflug imaging (Pentacam HR, Oculus) at two time points: directly and ≥1 week after scleral lens removal. Steep, flat and maximal keratometry (K(steep), K(flat) and K(max)) and optical pachymetry were analyzed. A generalized estimating equation analysis was performed to correct for paired eyes...
August 2015: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/25746152/scleral-lenses-in-the-treatment-of-post-lasik-ectasia-and-superficial-neovascularization-of-intrastromal-corneal-ring-segments
#11
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
https://www.readbyqxmd.com/read/25710510/corneal-nerve-structure-and-function-after-long-term-wear-of-fluid-filled-scleral-lens
#12
Yvonne Wang, Daniel L Kornberg, Ryan M St Clair, Michelle Lee, Irma Muhic, Jessica B Ciralsky, Ana Alzaga Fernandez, Priyanka Sood, Kimberly C Sippel, Mark I Rosenblatt
PURPOSE: The aim of this study was to determine whether long-term wear of a fluid-filled scleral lens alters basal tear production, corneal sensation, corneal nerve density, and corneal nerve morphology in 2 disease categories. METHODS: Patients recruited from the Prosthetic Replacement of the Ocular Surface Ecosystem (PROSE) treatment program at the Weill Cornell Medical College were categorized into 2 groups: distorted corneas (DC) or ocular surface disease (OSD)...
April 2015: Cornea
https://www.readbyqxmd.com/read/25655598/how-can-we-prevent-myopia-progression
#13
REVIEW
Thomas Chassine, Max Villain, Christian P Hamel, Vincent Daien
PURPOSE: Myopia has increased worldwide during recent years and is becoming a serious public health problem. In East Asia, the prevalence can reach 80% of the population. The focus for screening and interventions should be on early life during childhood when myopia progression is faster. METHODS: Review and discussion of the recent literature on potential interventions for preventing the development of myopia or slowing its progression. RESULTS: Increased time spent outdoors is a protective factor for myopia progression...
July 2015: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/25457628/mini-scleral-lenses-in-the-visual-rehabilitation-of-patients-after-penetrating-keratoplasty-and-deep-lamellar-anterior-keratoplasty
#14
Fateme Alipour, Mahmoud Jabarvand Behrouz, Behnaz Samet
OBJECTIVE: To evaluate fitting feasibility, efficacy, and safety of mini scleral contact lenses in correcting post corneal graft vision. METHODS: Prospective interventional case series, 56 visually unsatisfied post corneal graft eyes of 45 patients were fitted with miniscleral lenses (15.8 mm). Keratometric values, UCVA and BSCVA, fit, best corrected vision with the lens, decision to order lens, comfortable daily wearing time (CDWT), contact lens handling issues, and contact lens related complications were documented...
February 2015: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/25190661/oxygen-diffusion-and-edema-with-modern-scleral-rigid-gas-permeable-contact-lenses
#15
RANDOMIZED CONTROLLED TRIAL
Vicente Compañ, Cristina Oliveira, Marcel Aguilella-Arzo, Sergio Mollá, Sofia C Peixoto-de-Matos, José M González-Méijome
PURPOSE: We defined the theoretical oxygen tension behind modern scleral contact lenses (CLs) made of different rigid gas permeable (RGP) materials, assuming different thickness of the tear layer behind the lens. A second goal was to show clinically the effect of the postlens tear film on corneal swelling. METHODS: We simulated the partial pressure of oxygen across the cornea behind scleral CLs made of different lens materials (oxygen permeability Dk, 75-200 barrer) and different thickness (Tav, 100-300 μm)...
October 2014: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/25058902/prosthetic-replacement-of-the-ocular-surface-ecosystem-prose-scleral-device-compared-to-keratoplasty-for-the-treatment-of-corneal-ectasia
#16
COMPARATIVE STUDY
Karen S DeLoss, Nadeem H Fatteh, Christopher T Hood
PURPOSE: To compare the ocular characteristics and visual outcomes of eyes with corneal ectasia that were fitted with the Prosthetic Replacement of the Ocular Surface Ecosystem (PROSE) scleral device to those that underwent keratoplasty. DESIGN: Retrospective, comparative case series. METHODS: We reviewed the charts of consecutive patients with corneal ectasia that were evaluated for PROSE or underwent keratoplasty at our institution. Clinical data, topographic indices, and corneal thickness were reviewed, and eyes were stratified according to the Amsler-Krumeich classification for severity of ectasia...
November 2014: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/24901976/application-of-adipose-derived-stem-cells-on-scleral-contact-lens-carrier-in-an-animal-model-of-severe-acute-alkaline-burn
#17
Ladan Espandar, Delmar Caldwell, Richard Watson, Tomas Blanco-Mezquita, Shijia Zhang, Bruce Bunnell
PURPOSE: To evaluate the therapeutic effect of human adipose-derived stem cells (hASCs) overlaid on a scleral contact lens (SCL) carrier in a rabbit model of ocular alkaline burn. MATERIALS AND METHODS: After inducing alkaline burn in 11 New Zealand white rabbits, hASCs cultured on SCLs were placed on the right eye of 5 rabbits, SCLs without cells were used in 5, and no treatment was applied in 1 eye. Each eye was examined and photographed for corneal vascularization, opacities, and epithelial defect in week 1, 2, and 4 after surgery...
July 2014: Eye & Contact Lens
https://www.readbyqxmd.com/read/24631015/modern-scleral-contact-lenses-a-review
#18
REVIEW
Eef van der Worp, Dina Bornman, Daniela Lopes Ferreira, Miguel Faria-Ribeiro, Nery Garcia-Porta, José M González-Meijome
Scleral contact lenses (ScCL) have gained renewed interest during the last decade. Originally, they were primarily used for severely compromised eyes. Corneal ectasia and exposure conditions were the primary indications. However, the indication range of ScCL in contact lens practices seems to be expanding, and it now increasingly includes less severe and even non-compromised eyes, too. All lenses that partly or entirely rest on the sclera are included under the name ScCL in this paper; although the Scleral Lens Education Society recommends further classification...
August 2014: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/24418864/prose-for-irregular-corneas-at-a-tertiary-eye-care-center
#19
Amudha Oli Arumugam, Rajni Rajan, Madhumathi Subramanian, Rajeswari Mahadevan
OBJECTIVE: The aim of this study was to report and discuss the clinical experience with PROSE (Prosthetic Replacement of Ocular Surface Ecosystem) practice at a tertiary eye care hospital. METHODS: Retrospective data of patients who were prescribed PROSE during April 2011 to March 2012 in a tertiary eye care center in south India were analyzed. Data collected include patient demographics, indications of scleral lens fitting, previous correction modality, PROSE parameters, best-corrected visual acuity (BCVA) with spectacles, and BCVA with PROSE at initial assessment and few hours of wear...
March 2014: Eye & Contact Lens
https://www.readbyqxmd.com/read/24145631/functional-and-visual-improvement-with-prosthetic-replacement-of-the-ocular-surface-ecosystem-scleral-lenses-for-irregular-corneas
#20
Jennifer C Lee, Gloria B Chiu, Dianne Bach, Simon R Bababeygy, John Irvine, Martin Heur
PURPOSE: To evaluate the Doheny Eye Institute Experience with Prosthetic Replacement of the Ocular Surface Ecosystem (PROSE) scleral lenses for the management of irregular corneas with outcomes based on visual acuity (VA) and visual function. METHODS: A retrospective chart review of 58 subjects (90 eyes) with irregular corneal surfaces referred to the Doheny Eye Institute for PROSE treatment between July 2009 and December 2011 was performed. The best-corrected VA before and after PROSE fitting was recorded...
December 2013: Cornea
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