Vancomycin is the last resort antibiotic for the treatment of severe bacterial keratitis. Its clinical application is limited due to its hydrophilicity and high molecular weight. To overcome this, this study aims to develop nanoparticles-laden contact lens for controlled ocular delivery of vancomycin. Polyvinyl alcohol (PVA) was used as encapsulant material. The nanoparticles had a negative surface charge and an average size of 147.6 nm. A satisfactory encapsulation efficiency (61.24%) was obtained. The release profile was observed to be slow and sustained, with a release rate of 1.29 μL mg h for 48 h. Five out of 6 test bacteria were suppressed by vancomycin nanoparticles-laden contact lens. Vancomycin is generally ineffective against Gram-negative bacteria and unable to pass through the outer membrane barrier. In this study, vancomycin inhibited Proteus mirabilis and Pseudomonas aeruginosa. Nano-encapsulation enables vancomycin to penetrate the Gram-negative cell wall and further destroy the bacterial cells. On Hohenstein challenge test, all test bacteria exhibited significant reduction in growth when exposed to vancomycin nanoparticles-laden contact lens. This study created an effective and long-lasting vancomycin delivery system via silicone hydrogel contact lenses, by using PVA as encapsulant. The antibiotic efficacy and vancomycin release should be further studied using ocular in vivo models.
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http://dx.doi.org/10.1016/j.chemosphere.2023.139492 | DOI Listing |
Cureus
November 2024
Ophthalmology, Universiti Sains Malaysia, Kota Bharu, MYS.
Gonococcal keratoconjunctivitis (GKC) is an aggressive infection caused by , which can cause an acute, dreadful, ulcerative keratitis resulting in blindness if left untreated. We report a rare case of bilateral GKC complicated with left eye corneal perforation. A 20-year-old male presented with bilateral eye purulent discharge associated with vision loss over the left eye for two weeks prior to presentation.
View Article and Find Full Text PDFClin Optom (Auckl)
December 2024
Eminent Ophthalmic Services, LLC, Milledgeville, GA, USA.
Purpose: The purpose of this work was to determine the comfort performance of a toric, monthly, silicon hydrogel CL (lehfilcon A; TOTAL30 for Astigmatism) over a long day of wear.
Methods: This was a 1-month, 3-visit, prospective, single-arm study. Adult, 18- to 45-year-old CL wearers with good vision who were minimally symptomatic (CLDEQ-8 scores ≤12) were enrolled.
Digit J Ophthalmol
December 2024
NIHR Biomedical Research Centre, Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London, United Kingdom.
We present 3 cases of bilateral anterior lens capsule rupture, all leading to a subsequent diagnosis of Alport syndrome. Clinicians should be alert to the ocular and systemic features of Alport syndrome, especially when presented with a spontaneous rupture of the anterior lens capsule in young males. Ophthalmologists are often the first contact for patients with Alport syndrome, and a sound knowledge of the associated features will enable timely referral to other members of a multidisciplinary team required to treat such patients.
View Article and Find Full Text PDFFront Mol Neurosci
December 2024
Department of Translational Genomics, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States.
Background: Retinal degeneration is a major cause of irreversible blindness. Stimulation with controlled low-level electrical fields, such as transcorneal electrical stimulation (TES), has recently been postulated as a therapeutic strategy. With promising results, there is a need for detailed molecular characterization of the therapeutic effects of TES.
View Article and Find Full Text PDFInt J Ophthalmol
December 2024
Ophthalmology Department, Tanta University Hospital, Gharbia Governorate 31527, Egypt.
Aim: To investigate the magnitude of problem caused by resistant corneal ulcers and its epidemiological characteristics.
Methods: Patients with corneal lesions were selected and carefully examined and cases with resistant corneal ulcers were further investigated and data were recorded using a specific data sheet designed in hospital. Then, collected data from patients were statistically analyzed.
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