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Eye, contact lenses, scleral lenses, cornea

AnnMarie Hipsley, Brad Hall, Karolinne M Rocha
Presbyopia corrections traditionally have been approached with attempts to exchange power, either at the cornea or the lens planes, inducing multifocality, or altering asphericity to impact the optical system. Treatments that affect the visual axis, such as spectacle and contact lens correction, refractive surgeries, corneal onlays and inlays, and intraocular lenses are typically unable to restore true accommodation to the presbyopic eye. Their aim is instead to enhance 'pseudoaccommodation' by facilitating an extended depth-of-focus for which vision is sufficient...
2018: Eye and Vision (London, England)
Daddi Fadel
PURPOSE: To summarize the research findings on the ocular surface profile, to provide a definition and a classification of the corneoscleral shape, and to offer guidelines in selecting scleral lens design. METHODS: The definition of rotational symmetry and rotational asymmetry was inquired and PubMed searches were conducted. RESULTS: The better understanding of the scleral contact lens comportment on the eye and the introduction of new diagnostic instruments to measure the anterior ocular surface have led to improve comprehension of corneoscleral contour formulating new scleral lens designs...
February 26, 2018: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
Varsha M Rathi, Mukesh Taneja, Srikanth Dumpati, Preeji S Mandathara, Virender S Sangwan
PURPOSE: To report the rare coexistence of keratoconus and Stevens-Johnson syndrome (SJS) managed with scleral contact lenses (ScCLs). METHODS: This is a retrospective case series. Five patients (9 eyes) who had coexisting SJS and corneal ectasia were identified from the database during the 2-year period. Diagnosis of SJS was based on a positive history of drug reactions, signs of ocular surface disease, and the presence of keratinization of lid margins. Keratoconus was diagnosed by slit-lamp biomicroscopy...
October 2017: Cornea
Esteban Porcar, Juan Carlos Montalt, Enrique España-Gregori, Cristina Peris-Martínez
PURPOSE: To analyse the visual quality achieved by fitting corneo-scleral contact lenses (CScL) in an uncommon case of bilateral keratoconus, high hyperopia and astigmatism. METHODS: A 45-year-old man presented for eye examination due to the unsatisfactory quality of his vision wearing soft toric contact lenses. He presented high hyperopia and astigmatism with bilateral keratoconus. He was fitted with CScL to correct his irregular astigmatism and ocular aberrations...
October 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
Chelsea Bray, Stephanie Britton, Debby Yeung, Lacey Haines, Luigina Sorbara
PURPOSE: The purpose of this study was to determine the change in over-refraction, if any, after a scleral lens settled on the eye for 6-8 h. METHODS: Sixteen patients of varying refractive errors and normal corneal curvatures (measured with Pentacam™ Oculus) were fitted with trial Mini-Scleral Design (MSD) scleral lenses (15.8 mm diameter) in one eye. The sagittal depths of the scleral lenses were selected by adding 350 μm to the corneal sagittal heights measured at a chord length of 15 mm with the Visante™ optical coherence tomographer (OCT) anterior segment scans and picking the closest available trial lens in the set...
July 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
Victor Zaki
RATIONALE: This is a retrospective study aimed to determine the efficacy of mini-scleral contact lens in protecting the cornea and improving vision in cases of facial palsy. PATIENT CONCERNS: Patients with facial palsy get exposure keratitis because the cornea is dry. They feel pain, discomfort and excessive watering. If left untreated, it leads to permanent damage to the cornea and loss of good functional vision. Mini-scleral lens keep the cornea covered by saline solution all wearing hours...
February 2017: Medicine (Baltimore)
Esteban Porcar, Juan Carlos Montalt, Enrique España-Gregori, Cristina Peris-Martínez
PURPOSE: We describe a case of fitting a corneo-scleral contact lens with a multi-aspheric geometry design (MAGD CScL) on top of a daily silicone hydrogel lens (piggyback system) for keratoconus management. METHODS: A 48-year-old man using soft toric contact lenses required an improvement in the unsatisfactory quality of his vision. He presented with bilateral asymmetric keratoconus with high myopia in the right eye (RE) and severe myopia in the left eye (LE). In addition, he had low vision in his LE because of a maculopathy...
June 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
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
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
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...
January 2018: Eye & Contact Lens
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
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
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...
January 2017: Eye & Contact Lens
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
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
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
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
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
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
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
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