PubMed Journals Articles About "Performance Of Rigid Gas Permeable (RGP) Scleral Contact Lenses With A Passive Artificial Iris" RSS

01:07 EST 22nd February 2020 | BioPortfolio

Performance Of Rigid Gas Permeable (RGP) Scleral Contact Lenses With A Passive Artificial Iris PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Performance Of Rigid Gas Permeable (RGP) Scleral Contact Lenses With A Passive Artificial Iris articles that have been published worldwide.

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Showing "Performance Rigid Permeable Scleral Contact Lenses With Passive" PubMed Articles 1–25 of 13,000+

Outcomes of Scleral Contact Lens Use in Veteran Population.

To document outcomes associated with use of scleral contact lenses (SL) in the veteran population and analyze the medical and demographic factors that affect these outcomes, specifically those involved in contact lens discontinuation.

Prevalence of Ocular Surface Disease and Corneal Irregularity and Outcomes in Patients Using Therapeutic Scleral Lenses at a Tertiary Care Center.

To describe indications for scleral contact lens (ScCL) evaluation, previous treatments, and outcomes of patients prescribed ScCL at a tertiary referral center.

Do Polymer Coatings Change the Aberrations of Conventional and Wavefront-guided Scleral Lenses?

The findings of this study indicate that patients could simultaneously be offered the individualized optical correction of wavefront-guided (WFG) lenses and the superior comfort afforded by polymer coatings. This could be helpful to patients with ectasia suffering ocular dryness or dependent on scleral lenses for lengthy periods of wear.

Corneal perforation due to 'lost' contact lenses.

An 87-year-old woman with Alzheimer's disease was referred to our eye clinic with a large corneal perforation of her right eye. On further examination a total of 15 contact lenses were found under the upper eyelid of her right eye; several lenses were also found in her left eye. During further evaluation we learned that our patient had experienced severe, recurrent and painful blepharoconjunctivitis for the past 3 years, for which she had consulted several ophthalmologists and other medical practitioners. T...

A one-year prospective study on scleral lens wear success.

To report the success rate of scleral lens wear and the lens handling learning curve from the wearers perspective.

Visual performance and high order aberrations with different contact lens prototypes with potential for myopia control.

: Contact lenses used for myopia control incorporate variable power distribution across the optic zone potentially creating degradation of the high order aberrations. The present study aims to evaluate the retinal image quality and visual performance in three prototypes of contact lenses intended to control axial elongation of the eye before they are considered for clinical trials. : This is a non-dispensing cross-over, double blind study where 30 right eyes of myopic subjects worn 3 multifocal test lenses ...

Anthocyanin-Functionalized Contact Lens Sensors for Ocular pH Monitoring.

Anthocyanins are bioactive compounds naturally found in a variety of leaves, fruits, and vegetables. Anthocyanin pigments undergo a modification in their chemical structure when exposed to different concentrations of hydrogen ions, and they were extensively studied to be used as active elements in biocompatible pH sensors. The ocular pH is a significant parameter to assess the ocular physiology in cases of postocular surgery, keratoconjunctivitis, and ocular rosacea. Contact lenses have the potential to be ...

Advances in Anterior Segment OCT For the Design and Fit of Scleral Lenses.

Contact Lens Health Week - August 19-23, 2019.

August 19-23, 2019, marks the sixth annual Contact Lens Health Week. In collaboration with partners from clinical, public health, industry, and regulatory sectors, CDC is promoting healthy contact lens wear and care practices to reduce the risk for eye infections among the approximately 45 million persons in the United States who wear contact lenses. Studies conducted following outbreaks of rare but serious eye infections in the United States have found that these infections occur most frequently in contact...

Cytomorphological assessment of the lid margin in relation to symptoms, contact lens wear and lid wiper epitheliopathy.

Lid wiper epitheliopathy (LWE) is insufficiently understood from a cytological perspective. This study set out to explore the relationship between the lid margin cytomorphology, LWE, contact lens wear, and lens-related symptoms. Habitual, symptomatic (n = 20) and asymptomatic (n = 20) soft, rigid gas permeable (n = 18) and non-contact lens wearers (n = 19) were enrolled. LWE was graded using lissamine green and the Korb scale; subjective symptoms were assessed using the Ocular Surface Diseas...

Carbon compositional analysis of hydrogel contact lenses by solid-state NMR spectroscopy.

Contact lenses are worn by over 140 million people each year and tremendous research and development efforts contribute to the identification and selection of hydrogel components and production protocols to yield lenses optimized for chemical and physiological properties, eye health and comfort. The final molecular composition and extent of incorporation of different components in contact lenses is routinely estimated after lens production through the analysis of the soluble components that were not include...

Clinical Findings and Ocular Symptoms Over 1 Year in a Sample of Scleral Lens Wearers.

To report the fitting aspects, clinical findings, and symptoms over 12 months of scleral lens (SL) wear.

Controlled In Vitro Delivery of Voriconazole and Diclofenac to the Cornea using Contact Lenses for the Treatment of Acanthamoeba Keratitis.

Acanthamoeba keratitis is caused by a protozoal infection of the cornea, with 80% of cases involving the improper use of contact lenses. The infection causes intense pain and is potentially blinding. However, early diagnosis improves treatment efficacy and the chances of healing. Despite the apparent accessibility of the cornea, patients do not always respond well to current eye drop treatments largely due to rapid dose loss due to blinking and nasolacrimal drainage. Here, the topical drug delivery of voric...

Anterior chamber lens sizing: Comparison of white-to-white and scleral spur-to-scleral spur methods.

To determine the most accurate method of estimating scleral-spur-to-scleral-spur (STS) distance for ophthalmologists without access to an anterior chamber optical coherence tomography (AS-OCT) instrument when selecting an anterior chamber intraocular lens (AC IOL).

2-D Peripheral image quality metrics with different types of multifocal contact lenses.

To evaluate the impact of multifocal contact lens wear on the image quality metrics across the visual field in the context of eye growth and myopia control. Two-dimensional cross-correlation coefficients were estimated by comparing a reference image against the computed retinal images for every location. Retinal images were simulated based on the measured optical aberrations of the naked eye and a set of multifocal contact lenses (centre-near and centre-distance designs), and images were spatially filtered ...

Laboratory analysis on the surface runoff pollution reduction performance of permeable pavements.

Permeable pavements are used to address the water quality impacts of urbanization. However, few quantitative relations are available on their pollutant removal performance with respect to varying conditions, especially for different components of a permeable pavement. Individually, the water quality performance of the surface pavement layer and gravel layer of a permeable pavement under various conditions was determined in laboratory-scale pavement cells. Our aim was to reveal the manner in which different ...

Healthy Contact Lens Behaviors Communicated by Eye Care Providers and Recalled by Patients - United States, 2018.

An estimated 45 million U.S. residents enjoy the benefits of contact lens wear, but many of them might be at increased risk for complications stemming from improper wear and care behaviors (1). One of the most serious complications of contact lens wear is a corneal infection known as microbial keratitis, which can sometimes result in reduced vision or blindness (2). In 2014, 50% of contact lens wearers reported ever sleeping in contact lenses, and 55% reported topping off* their contact lens solutions (3), ...

Impact of Changes in the Optical Density of Postlens Fluid on the Clinical Performance of Miniscleral Lenses.

To determine the impact of optical density changes in postlens fluid on clinical performance and to quantify these changes over time during miniscleral lens wear.

Effect of Orthokeratology Lens on Contrast Sensitivity Function and High-Order Aberrations in Children and Adults.

Overnight orthokeratology (OOK) lenses are used to temporarily decrease myopic refractive error and improve uncorrected vision. Overnight orthokeratology lenses significantly increase ocular and corneal high-order aberrations (HOAs) and compromise contrast sensitivity function (CSF) to a degree correlated with myopic correction achieved. In Taiwan, OOK lenses are mainly used in children for myopia control. However, information regarding its effects in this population remains limited. This study discusses th...

Biomechanical contribution of the sclera to dynamic corneal response in air-puff induced deformation in human donor eyes.

This study was conducted to evaluate the impact of varying scleral material properties on the biomechanical response of the cornea under air-puff induced deformation. Twenty pairs of human donor eyes were obtained for this study. One eye from each pair had its sclera stiffened using 4% glutaraldehyde, while the fellow eye served as control for uniaxial strip testing. The whole globes were mounted in a rigid holder and intraocular pressure (IOP) was set using a saline column. Dynamic corneal response paramet...

Contact lens-related corneal infection: Intrinsic resistance and its compromise.

Contact lenses represent a widely utilized form of vision correction with more than 140 million wearers worldwide. Although generally well-tolerated, contact lenses can cause corneal infection (microbial keratitis), with an approximate annualized incidence ranging from ∼2 to ∼20 cases per 10,000 wearers, and sometimes resulting in permanent vision loss. Research suggests that the pathogenesis of contact lens-associated microbial keratitis is complex and multifactorial, likely requiring multiple conspiri...

Is active recovery during cold water immersion better than active or passive recovery in thermoneutral water for post-recovery high intensity sprint interval performance?

High intensity exercise is impaired by increased esophageal temperature (Tes) above 38°C, and/or decreased muscle temperature (Tmus). We compared the effects of three 30-min recovery strategies following a first set of three 30-s Wingate tests (S1), on a similar post-recovery set of Wingate tests (S2). Recovery conditions were: passive recovery in thermoneutral (34°C) water (Passive-TN); active recovery (underwater cycling; ~33% maximum power), in thermoneutral (Active-TN); or cold (15°C) water (Active-C...

Generating Bessel beams with broad depth-of-field by using phase-only acoustic holograms.

We report zero-th and high-order acoustic Bessel beams with broad depth-of-field generated using acoustic holograms. While the transverse field distribution of Bessel beams generated using traditional passive methods is correctly described by a Bessel function, these methods present a common drawback: the axial distribution of the field is not constant, as required for ideal Bessel beams. In this work, we experimentally, numerically and theoretically report acoustic truncated Bessel beams of flat-intensity ...

Inverse dynamic estimates of muscle recruitment and joint contact forces are more realistic when minimizing muscle activity rather than metabolic energy or contact forces.

Assessment of contact forces is essential for a better understanding of mechanical factors affecting progression of osteoarthritis. Since contact forces cannot be measured non-invasively, computer simulations are often used to assess joint loading. Contact forces are to a large extent determined by muscle forces. These muscle forces are computed using optimization techniques that solve the muscle redundancy problem by assuming that muscles are coordinated in a way that optimizes performance (e.g., minimizes...

Cellular and cytoskeletal alterations of scleral fibroblasts in response to glucocorticoid steroids.

Steroid-induced ocular hypertension can be seen even after trabecular meshwork (TM) bypass/ablation. Thus, the purpose was to investigate steroid-response in cells distal to the TM by using primary scleral fibroblasts. Primary scleral cell cultures were generated using mid-depth scleral wedges from human donor corneo-scleral rims (n = 5) after corneal transplantation. Cells were treated with dexamethasone (DEX; 100 nM) and compared to media (MED)/vehicle (DMSO) controls. Cell size, shape, and migratio...

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