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ocular surface

Kirilka Mladenova, Svetla D Petrova, Tonya D Andreeva, Veselina Moskova-Doumanova, Tanya Topouzova-Hristova, Yuri Kalvachev, Konstantin Balashev, Shomi S Bhattacharya, Christina Chakarova, Zdravko Lalchev, Jordan A Doumanov
Human bestrophin-1 (hBest1) is a transmembrane calcium-activated chloride channel protein - member of the bestrophin family of anion channels, predominantly expressed in the membrane of retinal pigment epithelium (RPE) cells. Mutations in the protein cause ocular diseases, named Bestrophinopathies. Here, we present the first Fourier transform infrared (FTIR) study of the secondary structure elements of hBest1, π/A isotherms and hysteresis, Brewster angle microscopy (BAM) and atomic force microscopy (AFM) visualization of the aggregation state of protein molecules dispersed as Langmuir and Langmuir-Blodgett films...
October 13, 2016: Colloids and Surfaces. B, Biointerfaces
Debarun Dutta, Ajay K Vijay, Naresh Kumar, Mark D P Willcox
Purpose: To determine the ability of antimicrobial peptide melimine-coated contact lenses to reduce the incidence of microbial keratitis (MK) in a rabbit model of contact lens wear. Methods: In vitro antimicrobial activity of melimine-coated contact lenses was determined against Pseudomonas aeruginosa by viable count and a radiolabeled assay. The amount of lipopolysaccharide (LPS) associated with bacteria bound to melimine-coated and control lenses was determined...
October 1, 2016: Investigative Ophthalmology & Visual Science
Saieede Soltani, Parvin Zakeri-Milani, Mohammad Barzegar-Jalali, Mitra Jelvehgari
Purpose: The objective of this study was to develop, characterize, and comparatively investigate the ketotifen fumarate (KF) nanosuspensions (NSS) to enhance the permeability of KF. Methods: In the present work, the NSP and NSE were prepared by double-emulsion solvent evaporation/nanoprecipitation methods with poly (D,Llactide-co-glycolide) and Eudragit RL100 polymers, respectively. The loading efficiency, particle size, and polydispersity index of prepared different NSs were evaluated with scanning electron microscopy (SEM), X-ray diffraction, differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), and in vitro release and transcorneal permeation ...
September 2016: Advanced Pharmaceutical Bulletin
Stefanie M Chan, Tatyana F Svitova, Meng C Lin
Contact lens discomfort is a common problem that can lead to unsuccessful or limited contact lens wear. Although many factors may contribute to contact lens discomfort, limited research has explored the influence of ethnicity-related differences in the anatomy and physiology of the ocular surface. Therefore, we performed a search of the literature in PubMed using key words related to "ocular surface" paired with the terms "race" and "ethnicity." The goal of this review was to determine potential areas of research regarding ethnicity differences, particularly between Asian and non-Asian eyes, in ocular surface integrity to advance our understanding of contact lens discomfort...
October 19, 2016: Eye & Contact Lens
David F Woodward, Stacey L Wenthur, Tara L Rudebush, Shan Fan, Carol B Toris
PURPOSE: Since all prostanoid receptors affect intraocular pressure (IOP) and endogenous prostanoids are found in ocular tissues, the pressor effects of prostanoid antagonists were comprehensively evaluated. The absence of effects of most of these antagonists was not entirely anticipated. To ensure no false-negative results, ocular biodisposition studies were conducted. METHODS: Monkeys with laser-induced ocular hypertension were used to study antagonist effects on IOP...
October 20, 2016: Journal of Ocular Pharmacology and Therapeutics
J J Huang, Q F Liang, B Li
The diagnosis of keratoconjunctival tumors were mainly relied on the examination of the slit lamp microscope and histopathology till now. Making an accurate diagnosis to ocular surface tumor in time was very important for deciding the treatment method and evaluating the prognosis. In recent years, in vivo confocal microscopy (IVCM) has been used in ophthalmic clinical diagnosis as a new evaluation method. It was easy to detect cytological characteristics of ocular surface diseases safely in vivo. More and more researches results have shown that IVCM could provide powerful supports to the diagnosis and management of keratoconjunctival tumors, especially for the pigmented tumors and ocular surface squamous neoplasia...
October 11, 2016: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
Y Zhao, H Zhao, J Y Lin, Y Pan, W J Zhai, Y C Wang
Objective: To analyze the clinical features and pathological classification of chlidren's ocular tumors. Methods: Retrospective case series study. Five hundred and four cases (506 eyes) of ocular tumor with biopsy-proven in children below 14 years old between January 2002 and December 2014 from Tianjin Eye Hospital were performed to retrospectively investigated the lesion location, clinical features and histopathologic classification of these lesions. Results: Of 504 cases there were 246 boys (248 eyes) and 258 girls (258 eyes) patients...
October 11, 2016: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
B Li, Q F Liang
Impression cytology (IC) has been widely used as a method for evaluating the ocular surface and superficial cells layers in the diagnosis and follow-up after treatment of several ocular surface tumors of both epithelial and melanocytic origin. Compared with exfoliative cytology with spatula, IC is less traumatic to the patient's eye. It provides a precise location of the area being studied and allows accurate observation of the cells the way they exist in vivo. The additional advantage of IC is the preservation of limbal stem cells responsible for continuous corneal epithelium renewal...
October 11, 2016: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
Guoxin Tan, Shihui Yu, Hao Pan, Jinyu Li, Dandan Liu, Kun Yuan, Xinggang Yang, Weisan Pan
The aim of this study was to develop and characterize a novel colloidal system, namely, timolol maleate chitosan coated liposomes (TM-CHL) to enhance the ocular permeation, precorneal residence time and bioavailability. The resulting TM-CHL was the most promising formulation with a mean particle size of 150.7nm and an EE% of 75.83±1.61%. In vitro release of the TM-CHL showed an extended drug release profile. The TM-CHL exhibited significant mucin adhesion and compared with commercial eye drops, TM-CHL produced a 3...
October 17, 2016: International Journal of Biological Macromolecules
Geraint P Williams, Peter Nightingale, Sue Southworth, Alastair K O Denniston, Paul J Tomlins, Stephen Turner, John Hamburger, Simon J Bowman, S John Curnow, Saaeha Rauz
Purpose: Ocular mucous membrane pemphigoid (OcMMP) is a rare autoimmune disorder resulting in progressive conjunctival fibrosis and ocular surface failure leading to sight loss in up to 50%. This study was designed to optimize an ocular surface sampling technique for identification of novel biomarkers associated with disease activity and/or progressive fibrosis. Methods: Fifty-seven patients with OcMMP underwent detailed examination of conjunctival inflammation and fibrosis using fornix depth measurement...
October 1, 2016: Investigative Ophthalmology & Visual Science
Elif Demircan, Mehmet Citirik, Nilufer Berker, Hatice Unverdi, Sema Hucumenoglu
PURPOSE: To evaluate the ocular surface alterations and tear film functions in patients with ocular Behçet disease (BD). METHODS: This study included 48 eyes of 48 patients with inactive BD and a control group of 33 age- and sex-matched subjects. Schirmer I and tear break-up time (TBUT) tests were used to evaluate the tear film of the subjects. Impression cytology was used to evaluate morphological changes of the conjunctival surface epithelial cells. RESULTS: The mean Schirmer I test result was 11...
November 2016: Cornea
Asim V Farooq, Joshua H Hou, Sarmad Jassim, Zeeshan Haq, Elmer Y Tu, Jose de la Cruz, Maria S Cortina
OBJECTIVES: To determine the rate of biofilm formation on bandage contact lenses worn by patients with the Boston type 1 keratoprosthesis (K-Pro) while on prophylactic topical vancomycin versus linezolid. METHODS: Patients wearing a bandage contact lens (BCL) with a K-Pro were eligible for enrollment. After irrigation of the ocular surface with 5% povidone-iodine solution, each patient was placed on either topical vancomycin 15 mg/mL or linezolid 0.2% BID for one month...
October 13, 2016: Eye & Contact Lens
Michel Guillon, Kathy Dumbleton, Panagiotis Theodoratos, Trisha Patel, Tom Karkkainen, Kurt Moody
INTRODUCTION: Contact lens wearers of Asian descent may be predisposed to experience microtrauma of the ocular surface as a result a thinner post-lens tear film and higher eyelid tension, and these effects would be anticipated to be most marked in an older population. The objective of this study was to quantify the mechanical effects of the study contact lenses on the ocular surface in a population of presbyopic contact lens wearers of Asian descent. METHODS: Twenty established presbyopic contact lens wearers (hydrogel n=5, none habitual wearers of etafilcon A lenses; silicone hydrogel n=15) of Asian descent were refitted with etafilcon A multifocal daily disposable contact lenses (1-DAY ACUVUE MOIST MULTIFOCAL) for a period of 1 month of daily lens wear...
October 13, 2016: Eye & Contact Lens
Yue Yin, Lan Gong
PURPOSE: To observe reversibility of meibomian gland (MG) dropout and analyze correlated factors and to compare the treatment efficiency with and without eyelid hygiene in patients with meibomian gland dysfunction (MGD). METHODS: Consecutive 78 eyes of 78 MGD (stage 2-3) patients who finished follow-up examination after 1-month of treatment were recruited in this retrospective study. All patients were treated with artificial lubricant and eyelid hygiene. Related ocular surface evaluation and meibomian gland assessment were examined...
October 14, 2016: Cornea
David T Truong, Minh-Thuy Bui, H Dwight Cavanagh
PURPOSE: To review the epidemiology, risk factors, microbiologic spectrum, and treatment of microbial keratitis during a 5-year period at an urban public hospital in comparison with an adjacent private university practice. METHODS: Retrospective chart review in the 5-year interval, 2009 through 2014. Primary outcome measures included patient age at presentation, best-corrected visual acuity (BCVA), risk factors, culture and sensitivities, treatment, and complication occurrence...
October 7, 2016: Eye & Contact Lens
Linda Rose, Julia M Byrd, Yousuf Qaseem
IMPORTANCE: Currently the only treatment for recurrent pterygium is surgery. This is a phase 1 trial investigating ranibizumab as a medical treatment for recurrent pterygium. OBJECTIVE: To assess the safety and efficacy of subtenon Ranibizimab for recurrent pterygia. DESIGN: Subjects with recurrent pterygium received subtenon ranibizumab and were followed for 1 year. Safety parameters were measured. Photographs were taken and quantitatively analyzed to measure the short-term (2 months) and long-term (5-26 months) response to treatment...
October 7, 2016: Eye & Contact Lens
Marcella Nebbioso, Valeria Fameli, Magda Gharbiya, Marta Sacchetti, Anna Maria Zicari, Alessandro Lambiase
The dry eye disease (DED) is a chronic multifactorial disorder of the tears that also involves the ocular surface, the lacrimal glands, and meibomian dysfunction. Furthermore, DED is often associated with Sjögren's syndrome (SS) and other autoimmune disorders. Sometimes, this chronic or subclinical condition is difficult to diagnose and treat, due to its heterogeneity. Areas covered: A literature search of relevant publications about treatment of DED was performed. All relevant articles published between 2011 and 2016 were identified through a computerized search for review and clinical trials using Pub Med database...
October 18, 2016: Expert Opinion on Investigational Drugs
Negin Amirshekarizadeh, Hassan Hashemi, Ebrahim Jafarzadehpur, Ali Mirzajani, Abbasali Yekta, Mehdi Khabazkhoob
PURPOSE: To determine the effect of cyclopentolate, tropicamide, and artificial tear drops on higher-order aberrations (HOAs) in normal eyes with OPD-Scan III (Nidek Inc., Tokyo, Japan). METHODS: In this study, 189 eyes of individuals aged 20 to 35 years were selected as samples. Inclusion criteria were a corrected visual acuity of 20/20 or better, a minimum size of about 5 mm for the pupil in the dark, hyperopia and myopia less than 5 D, and astigmatism less than 2 D...
September 30, 2016: Eye & Contact Lens
Koray Gumus, Aysegul Guven, Miray Altnkaynak, Merve Keskin
OBJECTIVES: The aim of this study was to compare different measurement tools and parameters, including a new computer-assisted image processing technique for the quantitative analysis of the percentage of pterygium on the corneal surface, horizontal/vertical lengths obtained using slitlamp beam and surgical compass. METHODS: A total of 21 pterygia of 17 patients were included in the study. The pterygia were measured by three different methods: a slitlamp beam, a surgical compass, and a new computer-assisted image processing method...
September 30, 2016: Eye & Contact Lens
Swathi Kaliki, Suzanne K Freitag, James Chodosh
PURPOSE: To describe clinical presentation and histopathological features of a nodulo-ulcerative variant of ocular surface squamous neoplasia (OSSN). METHODS: Retrospective study. RESULTS: Six patients were identified with a nodulo-ulcerative variant of OSSN. Mean age at presentation was 56 years. One patient was immunosuppressed because of human immunodeficiency virus infection. The initial misdiagnosis was necrotizing scleritis/sclerokeratitis (n = 4), intraepithelial neoplasia (n = 1), and chalazion (n = 1)...
October 5, 2016: Cornea
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