scholarly journals Antimicrobial Efficacy of Contact Lens Solutions Assessed by ISO Standards

2021 ◽  
Vol 9 (10) ◽  
pp. 2173
Author(s):  
Cindy McAnally ◽  
Rhonda Walters ◽  
Allison Campolo ◽  
Valerie Harris ◽  
Jamie King ◽  
...  
Keyword(s):  
Contact Lens ◽  
Contact Lenses ◽  
Global Market ◽  
International Standards ◽  
Free Products ◽  
Corneal Ulcers ◽  
Opportunistic Bacteria ◽  
Contact Lens Solutions ◽  
Plate Counts ◽  
International Standards Organization

Microbial keratitis (MK) is an eye infection caused by opportunistic bacteria or fungi, which may lead to sight-threatening corneal ulcers. These microorganisms can be introduced to the eye via improper contact lens usage or hygiene, or ineffective multipurpose solutions (MPSs) to disinfect daily wear contact lenses. Thus, the patient’s choice and use of these MPSs is a known risk factor for the development of MK. It is then critical to determine the efficacy of popular MPSs against ubiquitous ocular microorganisms. Therefore, we compare the efficacy of nine major MPSs on the global market against four different microorganism species, and with four different common contact lenses. In accordance with International Standards Organization protocol 14729 and 18259, the microorganisms were inoculated into each MPS with and without contact lenses, and held for the manufacturer’s disinfection time, 24 h, and 7 days after challenge with Serratia marcescens or Fusarium spp. Plates were incubated for 2–7 days and plate counts were conducted to determine the number of surviving microorganisms. The majority of MPSs demonstrated significantly higher disinfection efficacies without contact lenses. Broadly, among the microorganisms tested, the OPTI-FREE products (Puremoist, Express, and Replenish) maintained the highest disinfection efficacies at the manufacturer’s stated disinfection time when paired with any contact lens, compared with other MPSs. These were followed closely by RevitaLens and renu Advanced. MPSs containing dual biocides polyquaternium-1 and myristamidopropyl dimethylamine possessed the highest disinfection efficacy against multiple ocular pathogens.

scholarly journals Tannic acid-modified silver nanoparticles enhance anti-Acanthamoeba activity without increasing cytotoxicity of three multipurpose contact lens solutions

2020 ◽  
Author(s):  
Edyta Beata Hendiger ◽  
Marcin Padzik ◽  
Agnieszka Żochowska ◽  
Wanda Baltaza ◽  
Gabriela Olędzka ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Tannic Acid ◽  
Contact Lens ◽  
Contact Lenses ◽  
Colorimetric Assay ◽  
Statistical Significance ◽  
Plant Metabolites ◽  
Contact Lens Solutions ◽  
Preventive Actions

Abstract Background: Free living amoebae of Acanthamoeba genus are cosmopolitan, widely distributed protozoans causing severe, vision-threatening corneal infection known as Acanthamoeba keratitis (AK). Majority of the increasing number of AK cases are associated with contact lenses use. Due to lack of effective therapies against AK, proper eye hygiene and effective contact lenses disinfection are crucial in prevention of this infection. Currently available multipurpose contact lens disinfection systems are not fully effective against Acanthamoeba trophozoites and cysts. There is an urgent need to increase the disinfecting activity of these systems to prevent Acanthamoeba keratitis infections. Synthesized nanoparticles have been recently studied and proposed as a new generation of anti-microbial agents. It is also known that plant metabolites, including tannins, present anti-parasitic activity. The aim of this study was to evaluate the anti-amoebic activity and cytotoxicity of the tannic acid-modified silver nanoparticles (AgTANPs) conjugated with the selected multipurpose contact lens solutions.Methods: The anti-amoebic activity of pure contact lens care solutions and nanoparticles conjugated with contact lens care solutions were examined in vitro by colorimetric assay, based on the oxido-reduction of AlamarBlue. The cytotoxicity assays were performed using a fibroblast HS-5 (ATCC CRL-11882) cell line. The results were statistically analyzed by ANOVA and Student-Newman-Keuls tests using the p<0.05 level of a statistical significance.Results: The obtained results showed that nanoparticles enhanced anti-Acanthamoeba activity of the tested contact lens solutions without increasing their cytotoxicity profile. The activity is enhanced within minimal disinfection time recommended by the manufacturer.Conclusions: The conjugation of the selected contact lens solutions with AgTANPs might be a novel and promising approach as a part of preventive actions of Acanthamoeba keratitis infections among contact lens users.

scholarly journals Comparison of Contact Lens Hygiene Compliance and Self-Management Behaviors between Medical and Non-Medical Students in Saudi Arabia

2018 ◽  
Vol 2 (2) ◽  
Keyword(s):  
Saudi Arabia ◽  
Medical Students ◽  
Contact Lens ◽  
Contact Lenses ◽  
Self Management ◽  
Management Behavior ◽  
Corneal Ulcers ◽  
Soft Contact Lenses ◽  
Significant Difference ◽  
Hygiene Compliance

Background: Contact lenses are commonly worn by young population for many purposes such as vision correction, cosmetic causes and as a fashion trend. Although wearing contact lens is safe and does not require expertise but it can cause serious eye infections and corneal ulcers, sometimes resulting into loss of vision. The study is designed to com-pare and observe the contact lens hygiene compliance and self-management behavior with a focus on the contact lens wearing habits, cleaning and maintenance of contact lens by different methods and self-prescription between the medical and non-medical students of the Saudi Arabia. Methods: Five hundred young contact lens wearers with an average age of 18-22 years were selected conveniently from the student population of Princess Nourah Bint Abdulrahman University, Riyadh. After taking informed consent from the participants, their level of contact lens hygiene compliance and self-management was assessed by using a peer-reviewed questionnaire. Results: The mean (±SD) age of the participants was 20.87± 1.696 years. Out of 500 students 37.8% were medical and 62.2% were non-medical students. 56% students were wearing contact lens for the cosmetic reasons while 43.6% students were using it for the correction of their myopic refractive error. Most of the students were using daily wear soft contact lenses (96.6%) by self-prescription (51.4%) and majority of them were buying them from general retail store (83.6%) instead of some proper optician. The self-management behavior was statistically significant among nonmedical students (p=0.026). There was no significant difference between the two groups regarding the compliance of the contact lens hygiene but the knowledge and awareness about the risks and complications was statistically high in the medical students (p= 0.028). Most of the students in our study had rated them as an average wearer. Conclusion: This study concludes that self-management with the contact lens use is very common among the nonmedical students of Saudi Arabia. Although they are good in the lens hygiene compliance but their knowledge about the risks and complications of contact lens use and the lens care accessories was significantly low.

scholarly journals Tannic acid-modified silver nanoparticles enhance anti-Acanthamoeba activity without increasing cytotoxicity of three multipurpose contact lens solutions

2020 ◽  
Author(s):  
Edyta Beata Hendiger ◽  
Marcin Padzik ◽  
Agnieszka Żochowska ◽  
Wanda Baltaza ◽  
Gabriela Olędzka ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Tannic Acid ◽  
Contact Lens ◽  
Contact Lenses ◽  
Colorimetric Assay ◽  
Statistical Significance ◽  
Plant Metabolites ◽  
Contact Lens Solutions ◽  
Preventive Actions

Abstract Background: Free living amoebae of the genus Acanthamoeba are cosmopolitan, widely distributed protozoans causing a severe, vision-threatening corneal infection known as Acanthamoeba keratitis (AK). The majority of the increasing number of AK cases are associated with contact lenses use. Appropriate eye hygiene and effective contact lenses disinfection are crucial in prevention of this infection because of the lack of effective therapies against AK. Currently available multipurpose contact lens disinfection systems are not fully effective against Acanthamoeba trophozoites and cysts. There is an urgent need to increase the disinfecting activity of these systems to prevent Acanthamoeba keratitis infections. Synthesized nanoparticles have been recently studied and proposed as a new generation of anti-microbial agents. It is also known that plant metabolites, including tannins, present anti-parasitic activity. The aim of this study was to evaluate the anti-amoebic activity and cytotoxicity of the tannic acid-modified silver nanoparticles (AgTANPs) conjugated with the selected multipurpose contact lens solutions.Methods: The anti-amoebic activity of pure contact lens care solutions and nanoparticles conjugated with contact lens care solutions were examined in vitro by a colorimetric assay, based on the oxido-reduction of AlamarBlue. The cytotoxicity assays were performed using a fibroblast HS-5 (ATCC CRL-11882) cell line. The results were statistically analyzed by ANOVA and Student-Newman-Keuls tests using the p<0.05 level of a statistical significance.Results: We show that nanoparticles enhanced anti-Acanthamoeba activity of the tested contact lens solutions without increasing their cytotoxicity profile. The activity is enhanced within the minimal disinfection time recommended by the manufacturer.Conclusions: The conjugation of the selected contact lens solutions with AgTANPs might be a novel and promising approach as a part of preventive actions of Acanthamoeba keratitis infections among contact lens users.

scholarly journals Tannic acid-modified silver nanoparticles enhance anti-Acanthamoeba activity without increasing cytotoxicity of three multipurpose contact lens solutions

2020 ◽  
Author(s):  
Edyta Beata Hendiger ◽  
Marcin Padzik ◽  
Agnieszka Żochowska ◽  
Wanda Baltaza ◽  
Gabriela Olędzka ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Tannic Acid ◽  
Contact Lens ◽  
Contact Lenses ◽  
Colorimetric Assay ◽  
Statistical Significance ◽  
Plant Metabolites ◽  
Contact Lens Solutions ◽  
Preventive Actions

Abstract Background: Free living amoebae of the genus Acanthamoeba are cosmopolitan, widely distributed protozoans causing a severe, vision-threatening corneal infection known as Acanthamoeba keratitis (AK). The majority of the increasing number of AK cases are associated with contact lenses use. Appropriate eye hygiene and effective contact lenses disinfection are crucial in prevention of this infection because of the lack of effective therapies against AK. Currently available multipurpose contact lens disinfection systems are not fully effective against Acanthamoeba trophozoites and cysts. There is an urgent need to increase the disinfecting activity of these systems to prevent Acanthamoeba keratitis infections. Synthesized nanoparticles have been recently studied and proposed as a new generation of anti-microbial agents. It is also known that plant metabolites, including tannins, present anti-parasitic activity. The aim of this study was to evaluate the anti-amoebic activity and cytotoxicity of the tannic acid-modified silver nanoparticles (AgTANPs) conjugated with the selected multipurpose contact lens solutions.Methods: The anti-amoebic activity of pure contact lens care solutions and nanoparticles conjugated with contact lens care solutions were examined in vitro by a colorimetric assay, based on the oxido-reduction of AlamarBlue. The cytotoxicity assays were performed using a fibroblast HS-5 (ATCC CRL-11882) cell line. The results were statistically analyzed by ANOVA and Student-Newman-Keuls tests using the P < 0.05 level of a statistical significance.Results: We show that nanoparticles enhanced anti-Acanthamoeba activity of the tested contact lens solutions without increasing their cytotoxicity profile. The activity is enhanced within the minimal disinfection time recommended by the manufacturer.Conclusions: The conjugation of the selected contact lens solutions with AgTANPs might be a novel and promising approach as a part of preventive actions of Acanthamoeba keratitis infections among contact lens users.

scholarly journals A comparison of the ability of three common contact lens solutions with different constituents to inhibit growth of Staphylococcus aureus

2015 ◽  
Vol 74 (1) ◽  
Author(s):  
Marsha Oberholzer ◽  
Jacques Raubenheimer ◽  
Marga Lyell ◽  
Sade Pieterse ◽  
Aveli Keyser ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Contact Lens ◽  
Contact Lenses ◽  
Iso Standard ◽  
Iso Standards ◽  
Soft Contact Lenses ◽  
Log Reduction ◽  
Contact Lens Solutions ◽  
Mucosal Surfaces ◽  
Solution Saline

Background: Staphylococcus aureus is a common commensal on skin and mucosal surfaces; its contact with the eye may cause a variety of ocular inflammations and infections such as blepharitis, conjunctivitis and keratitis, amongst others. Soft contact lenses provide perfect conditions for the breeding of certain pathogens, and disinfecting solutions for contact lenses are therefore of utmost importance. These solutions should be effective in inhibiting the growth of a variety of pathogens to protect the user from ocular infections.Aim: To highlight the need for clinicians to be aware of the effects of various recommended disinfecting contact lens solutions.Method: Three popular disinfecting contact lens solutions readily available in South Africa were chosen. These and a control solution (saline) were prepared and inoculated with S. aureus to evaluate the antimicrobial efficacy of each solution. The primary stand-alone test was used to evaluate the solutions according to the ISO standard specifically for this purpose.Results: The test results indicated that two of the solutions met the ISO standards; the third failed. Of the two that passed the test, only one showed the required 3-log reduction after 30 minutes, as per the ISO standard, although this solution is marketed as a ’10 minute system’.Conclusion: It is important for clinicians to be aware of the complications that may be caused by contaminated solutions, and patients should be warned about the effects thereof. To ensure healthy eyes for our patients, sufficient knowledge regarding the efficacy of recommended multipurpose solutions is necessary. Solutions that meet ISO standards promote good ocular health and ensure sufficient cleaning and disinfecting of contact lenses.

Effect of contact lens solutions on the antimicrobial efficacy of human tear proteins extracted from contact lenses

2012 ◽  
Vol 35 ◽  
pp. e25
Author(s):  
Bianca L. Price ◽  
Philip B. Morgan ◽  
Carole Maldonado-Codina ◽  
Curtis B. Dobson
Keyword(s):  
Contact Lens ◽  
Contact Lenses ◽  
Antimicrobial Efficacy ◽  
Tear Proteins ◽  
Contact Lens Solutions

scholarly journals Tannic acid-modified silver nanoparticles enhance anti-Acanthamoeba activity without increasing cytotoxicity of the contact lens solutions

2020 ◽  
Author(s):  
Edyta Beata Hendiger ◽  
Marcin Padzik ◽  
Agnieszka Żochowska ◽  
Wanda Baltaza ◽  
Gabriela Olędzka ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Tannic Acid ◽  
Contact Lens ◽  
Contact Lenses ◽  
Colorimetric Assay ◽  
Statistical Significance ◽  
Acanthamoeba Keratitis ◽  
Plant Metabolites ◽  
Contact Lens Solutions

Abstract Background: Free living amoebae of Acanthamoeba genus are cosmopolitan, widely distributed protozoans causing severe, vision-threatening corneal infection known as Acanthamoeba keratitis (AK). Majority of the increasing number of AK cases are associated with contact lenses use. Due to lack of effective therapies against AK, proper eye hygiene and effective contact lenses disinfection are crucial in prevention of this infection. Currently available multipurpose contact lens disinfection systems are not fully effective against Acanthamoeba trophozoites and cysts. There is an urgent need to increase the disinfecting activity of these systems to prevent Acanthamoeba keratitis infections. Synthesized nanoparticles have been recently studied and proposed as a new generation of anti-microbial agents. It is also known that plant metabolites, including tannins, present anti-parasitic activity. The aim of this study was to evaluate the anti-amoebic activity and cytotoxicity of the tannic acid-modified silver nanoparticles (AgTANPs) conjugated with selected multipurpose contact lens solutions. Methods: The anti-amoebic activity of pure contact lens care solutions and nanoparticles conjugated with contact lens care solutions were examined in vitro by colorimetric assay, based on the oxido-reduction of AlamarBlue. The cytotoxicity assays were performed using a fibroblast HS-5 (ATCC CRL-11882) cell line. Results were statistically analyzed by ANOVA and Student-Newman-Keuls tests using the p<0.05 level of statistical significance. Results: The obtained results showed that nanoparticles enhanced anti-Acanthamoeba activity of the tested contact lens solutions without increasing their cytotoxicity profile. The activity is enhanced within minimal disinfection time recommended by the manufacturer. Conclusions: The conjugation of selected contact lens solutions with AgTANPs might be a novel and promising approach as part of preventive actions of Acanthamoeba keratitis infections among contact lens users.

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