791 results match your criteria Contact Lens Removal

Evaluation of the Quality, Reliability, and Educational Content of YouTube Videos as an Information Source for Soft Contact Lenses.

Eye Contact Lens 2021 Apr 27. Epub 2021 Apr 27.

Department of Ophthalmology, Haydarpaşa Numune Training and Research Hospital, University of Health Sciences, Istanbul, Turkey.

Objectives: To evaluate the quality, reliability, and educational content of YouTube videos related to soft contact lenses (CL).

Methods: An online YouTube search was performed for the terms contact lens and other common CL-related terms contact lens insertion and removal, contact lens wearing, and contact lens care. The first 50 videos were evaluated for each term. Read More

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Revisiting the Robustness of Pentacam HR Indices Against Soft Contact Lens Wear.

Clin Ophthalmol 2021 15;15:1573-1581. Epub 2021 Apr 15.

Ophthalmology Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt.

Purpose: To evaluate various selected Pentacam HR indices in a cohort of soft contact lens (SCL) wearers before and after SCL discontinuation.

Methods: Ninety right eyes of 90 SCL wearers (group 1) were compared to healthy controls (group 2). For group 1 eyes, Pentacam HR images were captured within one hour of SCL removal and after one month of discontinuation. Read More

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[Intraocular pressure with miniscleral contact lenses].

Vestn Oftalmol 2021 ;137(2):52-58

City Multidisciplinary Hospital No. 2, St. Petersburg, Russia.

According to literature data, some experts do not exclude the possibility that scleral lens wear could influence intraocular pressure.

Purpose: To evaluate the influence of rigid gas permeable miniscleral contact lenses on intraocular pressure (IOP), keratometry readings and corneal thickness, and to study the correlation between scleral (IOPs) and corneal (IOPc) intraocular pressure using the Icare ic100 tonometer (model TAO11, Icare Finland Oy).

Material And Methods: The study included 99 volunteers without history of ocular diseases. Read More

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A Review of Filamentary Keratitis.

Surv Ophthalmol 2021 Apr 13. Epub 2021 Apr 13.

Department of Ophthalmology, Long School of Medicine, University of Texas Health San Antonio, San Antonio, Texas. Electronic address:

Filamentary keratitis (FK) is characterized by presence of filaments on the corneal surface that are often associated with symptoms of foreign body sensation, irritation, and eye pain. FK is associated with a variety of ocular and systemic conditions, most notably dry eye disease. These filaments are composed primarily of epithelium, mucus, and cellular debris; however, their pathogenesis remains an area of debate. Read More

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Bowman Layer Onlay Grafting: Proof-of-Concept of a New Technique to Flatten Corneal Curvature and Reduce Progression in Keratoconus.

Cornea 2021 Apr 14. Epub 2021 Apr 14.

Netherlands Institute for Innovative Ocular Surgery, Rotterdam, the Netherlands; Melles Cornea Clinic Rotterdam, the Netherlands; Amnitrans EyeBank Rotterdam, the Netherlands; UAB, Birmingham, AL; and NIIOS-USA, San Diego, CA.

Purpose: The aim of this study was to describe a new surgical technique for flattening the corneal curvature and to reduce progression in eyes with advanced progressive keratoconus (KC) by using Bowman layer (BL) onlay grafting and to report on the preliminary outcomes of this procedure.

Methods: In this prospective interventional case series, 5 patients with advanced progressive KC underwent BL onlay grafting. After removal of the epithelium, a BL graft was placed and "stretched" onto the stroma, and a bandage lens was placed to cover the BL graft. Read More

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Early therapeutic lamellar keratoplasty for acanthamoeba keratitis followed by implantable Collamer lens for visual rehabilitation.

Middle East Afr J Ophthalmol 2020 Oct-Dec;27(4):244-246. Epub 2021 Jan 19.

Department of Ophthalmology, Imam Mohammad Ibn Saud Islamic University, Riyadh, Saudi Arabia.

We are reporting the case of a 25-year-old female who developed acanthamoeba keratitis after wearing contact lenses for high myopia. She was diagnosed as acanthamoeba and started the treatment of antiacanthamoeba for 3 consecutive weeks, followed by bare Descemet's therapeutic lamellar keratoplasty (LKP) with the maintenance of antiacanthamoeba treatment to control the infection. In the late postoperative period, visual rehabilitation was obtained by insertion of implantable Collamer lens (ICL) with her final visual outcome was 20/30. Read More

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January 2021

CLEAR - Evidence-based contact lens practice.

Cont Lens Anterior Eye 2021 Apr 25;44(2):368-397. Epub 2021 Mar 25.

School of Optometry and Vision Science, UNSW Sydney, Australia.

Evidence-based contact lens -->practice involves finding, appraising and applying research findings as the basis for patient management decisions. These decisions should be informed by the strength of the research study designs that address the question, as well as by the experience of the practitioner and the preferences and environment of the patient. This reports reviews and summarises the published research evidence that is available to inform soft and rigid contact lens history and symptoms taking, anterior eye health examination (including the optimised use of ophthalmic dyes, grading scales, imaging techniques and lid eversion), considerations for contact lens selection (including the ocular surface measurements required to select the most appropriate lens parameter, lens modality and material selection), evaluation of lens fit, prescribing (teaching self-application and removal, adaptation, care regimen and cleaning instructions, as well as -->minimising risks of lens wear through encouraging compliance) and an aftercare routine. Read More

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CLEAR - Orthokeratology.

Cont Lens Anterior Eye 2021 Apr 25;44(2):240-269. Epub 2021 Mar 25.

Centre for Ocular Research & Education (CORE), School of Optometry and Vision Science, University of Waterloo, Waterloo, Ontario, Canada; Centre for Eye and Vision Research (CEVR), Hong Kong Special Administrative Region.

Orthokeratology (ortho-k) is the process of deliberately reshaping the anterior cornea by utilising specialty contact lenses to temporarily and reversibly reduce refractive error after lens removal. Modern ortho-k utilises reverse geometry lens designs, made with highly oxygen permeable rigid materials, worn overnight to reshape the anterior cornea and provide temporary correction of refractive error. More recently, ortho-k has been extensively used to slow the progression of myopia in children. Read More

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Infectious keratitis after corneal crosslinking: a systematic review.

J Cataract Refract Surg 2021 Feb 22. Epub 2021 Feb 22.

1Department of Ophthalmology The University of Texas Southwestern Medical Center Dallas, TX.

Corneal crosslinking is an FDA approved therapy to stiffen the cornea and prevent progression of corneal ectasia in patients with keratoconus. The standard procedure involves removal of the corneal epithelium (epithelial-off) prior to treatment. Variations to the standard procedure include accelerated crosslinking and transepithelial procedures. Read More

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February 2021

Continuous 24-hour measurement of intraocular pressure in millimeters of mercury (mmHg) using a novel contact lens sensor: Comparison with pneumatonometry.

PLoS One 2021 23;16(3):e0248211. Epub 2021 Mar 23.

Glaucoma Research Centre, Montchoisi Clinic, Swiss Visio Network, Lausanne, Switzerland.

Purpose: To address the unmet need of continuous IOP monitoring, a Pressure-Measuring Contact Lens (PMCL) was developed to measure IOP in millimeters of mercury (mmHg) continuously over 24 hours. The present study assessed the reliability of the novel PMCL.

Methods: In this prospective open-label clinical study, healthy and open-angle glaucoma (OAG) subjects were fitted with the PMCL, and pneumatonometry was performed on study eyes (in absence of the PMCL) and on fellow eyes before, during, and after provocative tests. Read More

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Dematiaceous fungal invasion of a bandage contact lens.

BMJ Case Rep 2021 Feb 18;14(2). Epub 2021 Feb 18.

Ophthalmic Pathology, LV Prasad Eye Institute Bhubaneswar Campus, Bhubaneswar, India.

A 61-year-old man presented with a 1-month history of reduced vision, redness and pain in the right eye. Examination revealed a bandage contact lens (BCL) in situ with diffuse, pigmented deposits. On removal, the underlying cornea was found to be clear. Read More

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February 2021


Cont Lens Anterior Eye 2021 Feb 11:101403. Epub 2021 Feb 11.

Ophthalmology Department, Centro Hospitalar de Entre o Douro e Vouga, Santa Maria da Feira, Portugal.

Purpose: To investigate conjunctival vascular density (VD) using Anterior Segment Optical Coherence Tomography Angiography (OCTA) in Scleral Contact Lens (ScCL) wearers.

Methods: In this cross-sectional study, the conjunctival blood VD was assessed using OCTA with an anterior segment lens adapter. The nasal surface of each eye (6 ×6 mm) was scanned to a depth of 800 μm with ScCL and fifteen minutes after removing the lens. Read More

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February 2021

Outcomes of three surgical approaches for managing ectopia lentis in Marfan syndrome.

Eur J Ophthalmol 2021 Feb 7:1120672121992950. Epub 2021 Feb 7.

Department of Ophthalmology, University of Health Sciences, Istanbul Beyoglu Eye Training and Research Hospital, Istanbul, Turkey.

Objective: To investigate the clinical outcomes of three surgical approaches for ectopia lentis in Marfan syndrome (MS) patients who had undergone crystalline lens removal with posterior chamber intraocular lens (IOL) implantation techniques comprising the intrascleral fixation of IOL, sutured scleral fixation of IOL, and IOL implantation with the use of a Cionni capsular tension ring (CTR).

Methods: This is a retrospective comparative study, including 35 eyes of 21 patients who underwent the intrascleral fixation of IOL (group 1), scleral IOL fixation with the Z-suture (group 2), and IOL implantation with the use of a Cionni CTR (group 3) following crystalline lens removal. The surgical indications were as follows: no improvement in visual function after eyeglasses or contact lens application due to excessive irregular astigmatism and advanced crystalline lens decentration in which the edge of the crystalline lens came up to the optical axis, or dislocation of the crystalline lens resulting in aphakia and secondary glaucoma due to lens dislocation. Read More

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February 2021

Effects of Scleral Contact Lenses for Keratoconus Management on Visual Quality and Intraocular Pressure.

Ther Clin Risk Manag 2021 25;17:79-85. Epub 2021 Jan 25.

Eye Clinic, Department of Sense Organs, University of Rome Sapienza, Policlinico Umberto I, Rome, Italy.

Purpose: To evaluate the visual acuity level achieved by scleral contact lens (CL) fitting in patients affected by keratoconus and to evaluate possible intraocular pressure (IOP) changes during the scleral CL wear using a transpalpebral tonometer.

Methods: In a prospective case series a comparison was made between visual acuity obtained with glasses, RGP and 16.8mm diameter scleral CL in 30 consecutive patients affected by keratoconus. Read More

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January 2021

How a water drop removes a particle from a hydrophobic surface.

Soft Matter 2021 Feb 5;17(7):1746-1755. Epub 2021 Jan 5.

Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.

To understand the removal of particles from surfaces by water drops, we used an inverted laser scanning confocal microscope to image the collision between a water drop and a particle on a flat polydimethylsiloxane (PDMS) surface. The dynamic drop-particle contact line was monitored by fixing the drop directly above the objective lens while moving the sample stage at well-defined speeds (10-500 μm s). The lateral force acting on the drop during the collision was measured as a function of speed, using a force sensor mounted on the microscope. Read More

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February 2021

Inhibition of amyloid fibrillation of γD-crystallin model peptide by the cochineal Carmine.

Int J Biol Macromol 2021 Feb 18;169:342-351. Epub 2020 Dec 18.

Department of Molecular Microbiology and Biotechnology, The Shmunis School of Biomedicine and Cancer Research, Tel Aviv University, 69978 Tel Aviv, Israel; The Interdisciplinary Sagol School of Neurosciences, Tel Aviv University, 69978 Tel Aviv, Israel. Electronic address:

γD-crystallin is among the most abundant γ-crystallins in the human eye lens which are essential for preserving its transparency. Aging, and environmental changes, cause crystallins to lose their native soluble structure and aggregate, resulting in the formation of cataract. Current treatment of cataract is surgical removal which is costly. Read More

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February 2021

Glaucoma-Related Adverse Events at 10 Years in the Infant Aphakia Treatment Study: A Secondary Analysis of a Randomized Clinical Trial.

JAMA Ophthalmol 2021 02;139(2):165-173

Department of Ophthalmology, Stanford University School of Medicine, Palo Alto, California.

Importance: Glaucoma-related adverse events constitute serious complications of cataract removal in infancy, yet long-term data on incidence and visual outcome remain lacking.

Objective: To identify and characterize incident cases of glaucoma and glaucoma-related adverse events (glaucoma + glaucoma suspect) among children in the Infant Aphakia Treatment Study (IATS) by the age of 10.5 years and to determine whether these diagnoses are associated with optic nerve head (ONH) and peripapillary retinal nerve fiber layer (RNFL) assessment. Read More

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February 2021

Clear lens extraction for patients who are unfit for laser-assisted keratomileusis and implantable contact lenses in central Indian population.

Indian J Ophthalmol 2020 Dec;68(12):3002-3005

Department of Ophthalmology, Government Medical College, Nagpur, Maharashtra, India.

Purpose: The purpose of this study is to establish the safety of clear lens extraction (CLE) for the correction of high myopia in patients unfit for implantable contact lenses (ICLs) and laser in situ keratomileusis in the central Indian population.

Methods: In this retrospective observational study performed at a tertiary care centre, medical records of the patients who had undergone CLE with implantation of intraocular lens (IOL) to treat high myopia were retrieved. Details of the demographic profile, surgical procedure, complications, power, and type of IOLs implanted were recorded. Read More

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December 2020

Change in the geometry of positive- and negative-powered soft contact lenses during wear.

PLoS One 2020 9;15(11):e0242095. Epub 2020 Nov 9.

Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Toruń, Poland.

Contact lens wear causes mutual interactions between the ocular surface and the lens, which may affect comfort as well as vision. The aim of this study was to examine deformations in modern positive- and negative-powered silicone hydrogel soft contact lenses (SiH SCLs) after 7 days of continuous wear. This pre-post interventional study included 64 eyes: 42 eyes with myopia of -3. Read More

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December 2020

Knowledge, attitudes and practices of contact lens use in a South African adolescent population.

Afr Health Sci 2020 Jun;20(2):768-774

Discipline of Optometry College of Health Sciences University of KwaZulu-Natal Private Bag X54001 Durban 4000.

Background: Contact lens usage is becoming increasingly popular amongst young people. Assessing their knowledge, attitudes and practices in relation to contact lens wear is therefore important, so that gaps in understanding or incorrect practices can be rectified to promote continued safety and success of contact lens wear.

Objectives: This study aimed to assess and describe the knowledge, attitudes and practices of contact lens wearers aged 18 to 30 years, in the greater Durban area of South Africa. Read More

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Relationships between the material properties of silicone hydrogels: Desiccation, wettability and lubricity.

J Biomater Appl 2021 Mar 1;35(8):933-946. Epub 2020 Nov 1.

Faculty of Physics, Sofia University "St. Kliment Ohridski", Bulgaria.

Silicone hydrogels (SiHy), represent composite matrices composed of hydrophobic gas permeable silicone (Si) rich core and a surface enriched with hydrophilic polymer moieties. Their utilization in contact lens design requires number of SiHy properties (hydration, wettability, lubricity) to be optimized for the challenging conditions at the ocular surface. Typical limitations in literature are that (i) these properties are studied in isolation, monitoring only one parameter but not the rest of them, and (ii) measurements are performed with hydrated samples immediately after removal from storage solutions. Read More

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Clinical Performance of Samfilcon A, a Unique Silicone Hydrogel Lens, on a 7-Day Extended Wear Basis.

Clin Ophthalmol 2020 23;14:3457-3464. Epub 2020 Oct 23.

Vision Care, Bausch & Lomb Incorporated, Rochester, NY, USA.

Purpose: The objective of this study was to evaluate and compare the clinical performance of samfilcon A, a unique, polyvinylpyrrolidone (PVP)-containing, silicone hydrogel contact lens with that of the balafilcon A silicone hydrogel contact lens when worn on a 7-day extended wear basis.

Subjects And Methods: A total of 669 subjects completed this 12-month, controlled, parallel group, masked, randomized study; of these, 340 wore samfilcon A lenses and 329 balafilcon A lenses. Subjects wore their respective assigned lenses bilaterally on a 7-day extended wear basis. Read More

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October 2020

Dematiaceous Fungal Colonization of the Bandage Contact Lens in a Patient Lost to Follow-up During the COVID-19 Crisis.

Eye Contact Lens 2020 Nov;46(6):e66-e68

Department of Cornea and Anterior Segment (A.S., P.K., A.K.), Anand Eye Institute, Hyderabad, India; Sita Laxmi Glaucoma Center (T.M.), Anand Eye Institute, Hyderabad, India; and Consultant Microbiologist (A.K.R.), GHR Micro Diagnostics, Hyderabad, India.

We report a rare case of dematiaceous fungus colonization in the therapeutic bandage contact lens (BCL), in an eye with peripheral ulcerative keratitis. Bandage contact lens removal and appropriate treatment resulted in improvement of the visual acuity and prevented the spread of fungus to the underlying ocular structures. Microbiological evaluation of the BCL showed dematiaceous fungal filaments, and the fungus was identified as Bipolaris species. Read More

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November 2020

Cyclic Oligosaccharides as Active Drugs, an Updated Review.

Pharmaceuticals (Basel) 2020 Sep 29;13(10). Epub 2020 Sep 29.

Dipartimento di Chimica, Università di Torino, via P. Giuria 7, 10125 Torino, Italy.

There have been many reviews of the cyclic oligosaccharide cyclodextrin (CD) and CD-based materials used for drug delivery, but the capacity of CDs to complex different agents and their own intrinsic properties suggest they might also be considered for use as active drugs, not only as carriers. The aim of this review is to summarize the direct use of CDs as drugs, without using its complexing potential with other substances. The direct application of another oligosaccharide called cyclic nigerosyl-1,6-nigerose (CNN) is also described. Read More

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September 2020

Clinical Outcomes of Scleral Lens Fitting with a Data-driven, Quadrant-specific Design: Multicenter Review.

Optom Vis Sci 2020 09;97(9):761-765

Mayo Clinic Department of Ophthalmology, Rochester, Minnesota.

Significance: Alignment of the scleral lens haptic with the anterior ocular surface is of critical importance when fitting scleral lenses. The concept of leveraging big-data analysis to drive lens design is explored in this study. This retrospective study evaluated fitting outcomes of a data-driven, quadrant-specific scleral lens design and found that most patients (76%) were successfully fit with this design. Read More

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September 2020

Changes in Symptoms of Midday Fogging with a Novel Scleral Contact Lens Filling Solution.

Optom Vis Sci 2020 09;97(9):690-696

The Ohio State University College of Optometry, Columbus, Ohio.

Significance: Midday fogging of scleral contact lenses requires frequent lens removal and reapplication for a large portion of lens wearers. Using a lens filling solution that mimics the composition of tears is hypothesized to have an impact on the production of material trapped under a scleral lens.

Purpose: The purposes of this open-label study were to assess the safety of a scleral lens filling solution, which closely approximates the ionic concentration and pH of human tears, and to assess signs and symptoms of midday fogging with this formulation and with subjects' habitual sodium chloride solutions. Read More

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September 2020

Comparison of Pneumatonometry and Transpalpebral Tonometry Measurements of Intraocular Pressure during Scleral Lens Wear.

Optom Vis Sci 2020 09;97(9):711-719

Illinois College of Optometry, Chicago, Illinois.

Significance: As scleral lens wear becomes more common, understanding the impact of these lenses upon ocular physiology is critically important. Studies on the effect of scleral lens wear upon intraocular pressure (IOP) have used different instruments and have reported conflicting results.

Purpose: The purpose of this study was to compare assessment of IOP during scleral lens wear using pneumatonometry and transpalpebral tonometry. Read More

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September 2020

Fluid Reservoir Thickness and Corneal Edema during Open-eye Scleral Lens Wear.

Optom Vis Sci 2020 09;97(9):683-689

Contact Lens and Visual Optics Laboratory, Centre for Vision and Eye Research, School of Optometry and Vision Science, Institute of Health and Biomedical Innovation, Queensland University of Technology, Queensland, Australia.

Significance: There is debate concerning corneal oxygenation during scleral lens wear due to the potential additive hypoxic effect of a lens plus a fluid reservoir. This study investigated the agreement between theoretical models and empirical measurements of scleral lens-induced corneal edema with respect to central fluid reservoir thickness.

Purpose: The purpose of this study was to examine the effect of altering the fluid reservoir thickness on central corneal edema during short-term open-eye scleral lens wear and to compare these empirical measurements with predictive theoretical models. Read More

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September 2020

Scleral Lens-Induced Corneal Edema after Penetrating Keratoplasty.

Optom Vis Sci 2020 09;97(9):697-702

Contact Lens and Visual Optics Laboratory, School of Optometry and Vision Science, Queensland University of Technology, Brisbane, Australia.

Significance: Modern highly oxygen-permeable nonfenestrated scleral lenses induce approximately 1 to 2% corneal edema after short periods of lens wear in healthy individuals. This study investigated the magnitude and regional variation in scleral lens-induced central corneal edema after penetrating keratoplasty.

Purpose: The purpose of this study was to examine the magnitude and regional variation in corneal edema after a short period of scleral lens wear in post-penetrating keratoplasty eyes and a control group of eyes with healthy corneas. Read More

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September 2020

IOP and Optic Nerve Head Morphology during Scleral Lens Wear.

Optom Vis Sci 2020 09;97(9):661-668

University of Houston College of Optometry, Houston, Texas.

Significance: Scleral lenses (SLs) are increasing in scope, and understanding their ocular health impact is imperative. The unique fit of an SL raises concern that the landing zone causes compression of conjunctival tissue that can lead to resistance of aqueous humor outflow and increased intraocular pressure (IOP).

Purpose: This study aimed to assess changes in optic nerve head morphology as an indirect assessment of IOP and evaluate other IOP assessment methods during SL wear. Read More

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September 2020