16,443 results match your criteria contact lenses


Three Decades of Contact Lens-associated Microbial Keratitis in a Referral Hospital in São Paulo, Brazil.

Arq Bras Oftalmol 2021 Jul 14. Epub 2021 Jul 14.

Department of Ophthalmology and Visual Sciences, Escola Paulista de Medicina, Hospital São Paulo, Universidade Federal de São Paulo, São Paulo, SP, Brazil.

Purpose: The aim of this study was to analyze patient data and the laboratory results of corneal samples collected from patients followed at the Ophthalmology Department, Hospital São Paulo, Brazil over a 30-year period, and correlate the analize with contact lens wearing.

Methods: Corneal samples from patients diagnosed clinically with microbial keratitis between January 1987 and December 2016 were included in this study. Cultures that were positive for bacteria, fungi, and Acanthamoeba spp. Read More

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Experience of applying cosmetic Etafilcon A contact lens in cases with microcornea.

Arq Bras Oftalmol 2021 Jul 14. Epub 2021 Jul 14.

Eyup State Hospital, Istanbul, Turkey.

Purpose: Microcornea is a rare condition that frequently resulets in serious cosmetic concerns due to the resultant asymmetrical appearance of the eye, and its cosmetic rehabilitation is possible with the use of colored contact lenses. This paper aims to present our experiences with the use of cosmetic Etafilcon A contact lenses for microcornea.

Methods: Eight patients with unilateral microcornea without any systemic involvement were included in this study, and they underwent routine ophthalmological examination, corneal topography, and optical biometry. Read More

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Driving performance and road sign identification by multifocal contact lens wearers in a driving simulator.

Cont Lens Anterior Eye 2021 Jul 24:101493. Epub 2021 Jul 24.

The Ohio State University College of Optometry, United States.

Purpose: The purpose of this study was to compare sign identification distances and driving performance metrics in presbyopic participants while wearing multifocal contact lenses (MFCL) and while wearing progressive addition lens (PAL) spectacles.

Methods: 19 presbyopic participants completed PAL spectacle assessments and contact lens fitting and follow up visits before driving assessments began. These assessments occurred in a simulator equipped with a full-sized sedan on a motion platform and a 260 degree screen. Read More

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Dexamethasone-Eluting Contact Lens for the Prevention of Postphotorefractive Keratectomy Scar in a New Zealand White Rabbit Model.

Cornea 2021 Jul 22. Epub 2021 Jul 22.

Department of Ophthalmology, San Antonio Uniformed Services Health Education Consortium, San Antonio, TX; Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA; Laboratory for Biomaterials and Drug Delivery, Department of Anesthesiology, Division of Critical Care Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA; and Departments of Anesthesia and Surgery, Boston Children's Hospital, Harvard Medical School, Boston, MA.

Purpose: To evaluate the safety and efficacy of an experimental dexamethasone-eluting contact lens (DCL) for the prevention of postphotorefractive keratectomy (PRK) corneal haze in a New Zealand White (NZW) rabbit model.

Methods: Both eyes of 29 NZW rabbits underwent PRK. The rabbits were randomized to one of the 5 study arms for 4 weeks: tarsorrhaphy only, tarsorrhaphy and bandage contact lens (BCL) replaced weekly, tarsorrhaphy and BCL for 1 week plus topical 0. Read More

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In vitro affinity for nicotine of soft contact lenses of different materials.

Cont Lens Anterior Eye 2021 Jul 19:101490. Epub 2021 Jul 19.

University of Milano Bicocca, Materials Science Department, via R. Cozzi 55, I-20125 Milan, Italy; University of Milano Bicocca, COMiB Research Center, via R. Cozzi 55, I-20125 Milan, Italy.

Smoking is a risk factor for the development of microbial keratitis and corneal infiltrates in contact lens (CL) wearers. It is still unknown if this risk is directly associated with the presence of nicotine in the eye and if adherence of nicotine on the CL can enhance these effects. A better understanding of the interaction between nicotine and CL materials could offer insights to explain this risk associated with smoking. Read More

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Thermodynamic Investigation of Droplet-Droplet and Bubble-Droplet Equilibrium in an Immiscible Medium.

J Phys Chem B 2021 Jul 26. Epub 2021 Jul 26.

Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 1H9.

In the absence of external fields, interfacial tensions between different phases dictate the equilibrium morphology of a multiphase system. Depending on the relative magnitudes of these interfacial tensions, a composite system made up of immiscible fluids in contact with one another can exhibit contrasting behavior: the formation of lenses in one case and complete encapsulation in another. Relatively simple concepts such as the spreading coefficient (SC) have been extensively used by many researchers to make predictions. Read More

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Machine learning algorithm improves accuracy of ortho-K lens fitting in vision shaping treatment.

Cont Lens Anterior Eye 2021 Jul 20:101474. Epub 2021 Jul 20.

Department of Ophthalmology & Clinical Center of Optometry, Peking University People's Hospital, Beijing 100044, China; College of Optometry, Peking University Health Science Center, Beijing, China; Eye Disease and Optometry Institute, Peking University People's Hospital, China; Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, China.

Purpose: To construct a machine learning (ML)-based model for estimating the alignment curve (AC) curvature in orthokeratology lens fitting for vision shaping treatment (VST), which can minimize the number of lens trials, improving efficiency while maintaining accuracy, with regards to its improvement over a previous calculation method.

Methods: Data were retrospectively collected from the clinical case files of 1271 myopic subjects (1271 right eyes). The AC curvatures calculated with a previously published algorithm were used as the target data sets. Read More

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Influence of Face Masks on the Use of Contact Lenses.

Int J Environ Res Public Health 2021 Jul 11;18(14). Epub 2021 Jul 11.

ISEC LISBOA-Instituto Superior de Educação e Ciências,1750-179 Lisboa, Portugal.

Background: The COVID-19 epidemic is largely controlled by the use of face masks. The use of a face mask has been indicated as a strong cause of dry eye, although it is not yet described in the literature. This study aims to compare the impact of the use of masks on the visual quality of patients. Read More

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Mini-Scleral Contact Lens for Asian Eyes Post-Penetrating Keratoplasty with Smaller Palpebral Aperture: Case Reports.

Clin Optom (Auckl) 2021 20;13:161-166. Epub 2021 May 20.

CK St.Mary's Eye Center, Seoul, Republic of Korea.

Purpose: To report the use of miniscleral contact lenses (MSCLs) with diameter of 14.7 mm for Asian eyes to improve vision in patients after penetrating keratoplasty (PKP) surgery.

Methods: Two patients with high corneal astigmatism post-PKP were evaluated for a contact lens fitting. Read More

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Wearing Pattern and Awareness About Contact Lens Wear in Secondary School Students in Kuala Lumpur.

Clin Optom (Auckl) 2021 20;13:155-160. Epub 2021 May 20.

Optometry and Vision Science Program and Research Centre for Community Health, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia.

Purpose: To investigate the wearing pattern and awareness about contact lens care among secondary school students in Kuala Lumpur.

Patients And Methods: This is a cross-sectional study using self-administered validated questionnaires. A total of 2500 questionnaires were distributed to secondary school students (aged 13 to 18 years) from 5 selected schools in Kuala Lumpur. Read More

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A Corneal Perforation Related to Beauveria Bassiana and Post-Penetrating Keratoplasty Management Discussion.

Cureus 2021 Jun 17;13(6):e15724. Epub 2021 Jun 17.

Ophthalmology, Ophthalmiatreio Eye Hospital, Athens, GRC.

Fungal keratitis is an infection that is insidious and frequently misdiagnosed. Those with chronic eye surface conditions, contact lenses, systemic immunosuppression, and diabetes have been the most frequently affected with fungal keratitis. An 84-year-old male patient with a history of bilateral penetrating keratoplasty (PK) for keratoconus presented with pain and decreased visual acuity on his left eye. Read More

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Biocompatible Nanotransfer Printing Based on Water Bridge Formation in Hyaluronic Acid and Its Application to Smart Contact Lenses.

ACS Appl Mater Interfaces 2021 Jul 20. Epub 2021 Jul 20.

Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, South Korea.

Many conventional micropatterning and nanopatterning techniques employ toxic chemicals, rendering them nonbiocompatible and unsuited for biodevice production. Herein the formation of water bridges on the surface of hyaluronic acid (HA) films is exploited to develop a transfer-based nanopatterning method applicable to diverse structures and materials. The HA film surface, made deformable via water bridge generation, is brought into contact with a functional material and subjected to thermal treatment, which results in film shrinkage, allowing a robust pattern transfer. Read More

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Effect of material and care system combination on subclinical inflammation of the ocular surface in soft contact lens wear.

Cont Lens Anterior Eye 2021 Jul 16:101489. Epub 2021 Jul 16.

Eurolens Research, Division of Pharmacy and Optometry, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, United Kingdom.

Purpose: To investigate the ocular subclinical inflammatory response in two soft contact lens materials when used in combination with two different care systems ('solutions').

Methods: Fifteen established soft contact lens wearers wore each of two lenses: Acuvue® 2 (CH) and Acuvue® Oasys® (SiH) or no lenses in random sequence for one week. Two care systems were used: a peroxide system: Oxysept 1 Step® (P) for the right lens and Opti-Free® Replenish® (MPS) for the left lens. Read More

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Grey Filter Contact Lens as Therapeutic Option for Acquired Reduced Binocular Visual Performance.

Br Ir Orthopt J 2021 29;17(1):62-69. Epub 2021 Mar 29.

Amsterdam UMC, NL.

Disturbing binocular problems can be too complex to be treated in such a way that comfortable binocular single vision is restored. The grey filter contact lens could offer a safe and clinically useful way to help these patients.

Background: In unilateral acquired reduced visual performance or intractable diplopia the binocular performance often is less than the performance of the better eye, possibly leading to complaints of binocular visual functioning. Read More

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Shaping Eyeballs by Scleral Collagen Cross-Linking: A Hypothesis for Myopia Treatment.

Front Med (Lausanne) 2021 2;8:655822. Epub 2021 Jul 2.

Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China.

The global prevalence of myopia has brought to the attention of the different eye and vision specialists, who make way to control its progression. Evidence have shown that a proactive reshaping of the eyeball is the core point of myopia developing process, which particularly includes the weakening, thinning, and expanding of the sclera. Thus, the sclera is considered to be a prime target for therapeutic manipulation in halting progressive myopia. Read More

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Reported Patient Satisfaction and Spectacle Independence Following Bilateral Implantation of the PanOptix Trifocal Intraocular Lens.

Clin Ophthalmol 2021 6;15:2907-2912. Epub 2021 Jul 6.

Science in Vision, Bend, OR, USA.

Purpose: To assess the spectacle independence and satisfaction of subjects after bilateral implantation of the PanOptix trifocal intraocular lens (IOL) at the time of cataract surgery.

Design: Single site, prospective, single-arm study.

Methods: Eligible subjects interested in a trifocal IOL to potentially reduce dependence on spectacles for near, intermediate and distance vision were enrolled and followed for 3 months after the second eye surgery. Read More

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Quality-of-Life Improvement After Scleral Lens Fitting in Patients With Keratoconus.

Eye Contact Lens 2021 Jul 12. Epub 2021 Jul 12.

Department of Ophthalmology (F.B., A.C., L.A., E.B., L.L., A.M.B., C.C.-G.), University Hospital, Dijon, France; Clinical Epidemiology/Clinical Trials Unit (F.B., L.A.), INSERM, CIC1432, Clinical Investigation Center, Dijon University Hospital, Dijon, France; Taste and Food Science Centre (L.A., A.M.B., C.C.-G.), AgroSup Dijon, CNRS, INRAE, Bourgogne Franche-Comté University, Dijon, France; and EA7460 (F.B.), PEC2, Cerebral and Cardiovascular Epidemiology and Physiopathology, Dijon, France.

Objectives: To assess the quality-of-life improvement after scleral lens fitting in patients with keratoconus.

Methods: We conducted a prospective observational study of all consecutive patients with keratoconus starting scleral lens fitting in 2019, from January 2 to December 27, at the Dijon University Hospital, France. Quality of life was assessed before and after wearing scleral lenses for 3 months through the National Eye Institute Visual Function Questionnaire 25 (NEI-VFQ 25) questionnaire. Read More

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Atomic force microscopy comparative analysis of the surface roughness of two posterior chamber phakic intraocular lens models: ICL versus IPCL.

BMC Ophthalmol 2021 Jul 14;21(1):280. Epub 2021 Jul 14.

Hospital Universitario Príncipe de Asturias, Carretera Meco s/n, Madrid, Spain.

Background: To compare the anterior surface roughness of two commercially available posterior chamber phakic intraocular lenses (IOLs) using atomic force microscopy (AFM).

Methods: Four phakic IOLs were used for this prospective, experimental study: two Visian ICL EVO+ V5 lenses and two iPCL 2.0 lenses. Read More

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[Primary intraocular lens implantation can be applied in infants over 7 months of age and young children with adequate consideration].

Authors:
Y Lu T Y Zheng J Xu

Zhonghua Yan Ke Za Zhi 2021 Jul;57(7):487-491

Department of Ophthalmology, Eye & ENT Hospital of Fudan University, NHC Key Laboratory of Myopia (Fudan University), Laboratory of Myopia, Chinese Academy of Medical Science, Shanghai Key Laboratory of Visual Impairment and Restoration, Shanghai 200031, China.

In recent years, intraocular lenses (IOLs) have been increasingly used in the correction of aphakia after congenital cataract extraction. But IOL implantation in infants and young children, especially under 1 year old, is still controversy. Large-scale, multi-center, randomly controlled clinical observations on this issue have been conducted. Read More

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Effects of Temperature and Blinking on Contact Lens Dehydration of Contemporary Soft Lens Materials Using an In Vitro Blink Model.

Transl Vis Sci Technol 2021 07;10(8):11

Centre for Ocular Research & Education (CORE), School of Optometry and Vision Science, University of Waterloo, Waterloo, Ontario, Canada.

Purpose: The purpose of this study was to evaluate the effects of temperature and blinking on contact lens (CL) dehydration using an in vitro blink model.

Methods: Three silicone hydrogel (delefilcon A, senofilcon A, and comfilcon A) and two conventional hydrogel (etafilcon A and omafilcon A) CL materials were evaluated at 1 and 16 hours. The water content (WC) of the CLs was measured using a gravimetric method. Read More

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Myopia Control with Combination Low-Dose Atropine and Peripheral Defocus Soft Contact Lenses: A Case Series.

Case Rep Ophthalmol 2021 May-Aug;12(2):548-554. Epub 2021 Jun 14.

The Myopia Center, Rishon LeZion, Israel.

The goal of this retrospective case series is to demonstrate the effectivity of combination low-dose atropine therapy with peripheral defocus, double concentric circle design with a center distance soft contact lenses at controlling myopia progression over 1 year of treatment. Included in this series are 3 female children aged 8-10 years with progressing myopia averaging -4.37 ± 0. Read More

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On the art and science of rigid contact lens fitting.

Clin Exp Optom 2021 Jul 7:1-7. Epub 2021 Jul 7.

School of Optometry, The University of Alabama at Birmingham, Birmingham, AL, USA.

Clinical Relevance: Examination of the literature can help answer the age-old question of the extent to which rigid contact lenses can be considered an art versus a science.

Background: This work aims to assemble rigid contact lens-related publication metrics to identify the most impactful papers, authors, institutions, countries and journals.

Methods: A search was undertaken of the Scopus database to identify rigid contact lens-related articles published since this lens type was first described in 1949. Read More

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Diagnostic imaging of the ciliary body: Technologies, outcomes, and future perspectives.

Eur J Ophthalmol 2021 Jul 7:11206721211031409. Epub 2021 Jul 7.

Department of Ophthalmology, Hospital Clínico San Carlos, Instituto de Investigación Sanitaria (IdISSC), Madrid, Spain.

The ciliary body (CB) is part of the uvea and is a complex, highly specialized structure with multiple functions and significant relationships with nearby structures. Its functions include the aqueous humor (AH) production in the ciliary processes, the regulation of the AH output through the uveoscleral pathway, and accommodation, which depends on the ciliary muscle. Also, the CB is an important determinant of angle width as it forms part of the ciliary sulcus. Read More

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Control of myopia using orthokeratology lenses in Scandinavian children aged 6 to 12 years. Eighteen-month data from the Danish Randomized Study: Clinical study Of Near-sightedness; TReatment with Orthokeratology Lenses (CONTROL study).

Acta Ophthalmol 2021 Jul 7. Epub 2021 Jul 7.

Department of Ophthalmology, University Hospital of Southern Denmark, Vejle Hospital, Vejle, Denmark.

Purpose: To investigate the efficacy of myopia control defined by axial elongation and safety of orthokeratology lenses (OKL) in a Scandinavian (Danish) population.

Methods: Sixty Danish children aged 6-12 years with myopia ranging from 0.5 to 4. Read More

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Hydrogels-based ophthalmic drug delivery systems for treatment of ocular diseases.

Mater Sci Eng C Mater Biol Appl 2021 Aug 29;127:112212. Epub 2021 May 29.

School of Pharmacy, Jiangsu Key Laboratory of Inflammation and Molecular Drug Targets, Nantong University, 19 Qixiu Road, Nantong, Jiangsu Province 226001, China. Electronic address:

An increasing number of people worldwide are affected by eye diseases, eventually leading to visual impairment or complete blindness. Conventional treatment involves the use of eye drops. However, these formulations often confer low ocular bioavailability and frequent dosing is required. Read More

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Clinical Aspects of Stevens-Johnson Syndrome and Toxic Epidermal Necrolysis With Severe Ocular Complications in Brazil.

Front Med (Lausanne) 2021 18;8:649369. Epub 2021 Jun 18.

Department of Ophthalmology, Federal University of São Paulo, São Paulo, Brazil.

Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) are acute and potentially fatal inflammatory vesiculobullous reactions that affect the skin and mucous membranes, and which are most often triggered by particular medications and infections. In Brazil, the drugs most frequently associated with TEN and SJS include cold medicine such as dipyrone and NSAIDs, followed by carbamazepine, phenobarbital, penicillin, and allopurinol. Genetic variations have been found to increase the risk of SJS/TEN in response to triggering factors such as medications. Read More

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The disposable bandage soft contact lenses therapy and anterior segment optical coherence tomography for management of ocular graft-versus-host disease.

BMC Ophthalmol 2021 Jul 4;21(1):271. Epub 2021 Jul 4.

Department of Ophthalmology, University of Washington, 1959 NE Pacific St, Washington, Seattle, USA.

Purpose: To identify the ocular surface changes of ocular graft-versus-host disease (GVHD) using anterior segment optical coherence tomography (AS-OCT) and examine the efficacy of disposable bandage soft contact lens (BSCL) treatment in ocular GVHD patients.

Methods: This study is a prospective, Phase II clinical trial. Nineteen patients diagnosed with chronic GVHD based on the NIH criteria and ocular symptoms of NIH eye score 2 or greater were enrolled. Read More

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Evaluation of silicone hydrogel contact lenses based on poly(dimethylsiloxane) dialkanol and hydrophilic polymers.

Colloids Surf B Biointerfaces 2021 Jun 29;206:111957. Epub 2021 Jun 29.

Department of Mechanical Engineering, Can Tho University, 3/2 Street, Cantho City, Viet Nam.

Silicone hydrogel lenses were prepared by copolymerizing PDMS-PEGMA macromer (PGP) with various combinations of DMA, NVP, and PEGMA through UV initiated polymerization process. The resultant PGP macromer were characterized by gel permeation chromatography (GPC), and scanning electron microscope (SEM-EDS). Characterization of all the resultant co-polymers included Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), equilibrium water content (EWC), oxygen permeability (Dk), optical transparency, contact angle, mechanical properties, zeta potential, protein deposition, and cytotoxicity. Read More

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Refractory Dry Eye Syndrome after Transconjunctival Excision of the Palpebral Lobe of the Lacrimal Gland.

Medicina (Kaunas) 2021 Jun 11;57(6). Epub 2021 Jun 11.

Department of Ophthalmology, Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine, 170, Jomaru-ro, Bucheon 14584, Korea.

The aim of the present study was to report two cases of refractory dry eye syndrome (DES) after transconjunctival excision of the palpebral lobe of the lacrimal gland. A 25-year-old female patient with a chief complaint of a palpable mass in both upper eyelids visited our medical center. Preoperative orbital computer tomography showed high-attenuation lesions in both lacrimal glands. Read More

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