Navigation Links
Study supports safety of antimicrobial peptide-coated contact lenses

Philadelphia, Pa. (April 24, 2014) - Contact lenses coated with an antimicrobial peptide could help to lower the risk of contact lens-related infections, reports a study in Optometry and Vision Science, official journal of the American Academy of Optometry. The journal is published by Lippincott Williams & Wilkins, a part of Wolters Kluwer Health.

Studies in animals and now humans support the biocompatibility and safety of lenses coated with the antimicrobial peptide melimine, according to the new research by Debarun Dutta, B.Optom, of The University of New South Wales, Sydney, and colleagues. They write, "[T]his study has shown that melimine coated contact lenses can be safely worn by humans without any major side effects."

Synthetic Coating Designed to Mimic Natural Infection-Fighting Peptides

The researchers performed a series of experiments to evaluate the safety of contact lenses coated with melimine, designed to reduce the risk of inflammation and infections. Melimine is not an antibioticrather, it is a "cationic peptide" with broad-spectrum antimicrobial activity.

"Antimicrobial peptides are small peptides and part of the innate immune system of all multicellular organisms with the native ability to inhibit microbial growth," Dr Dutta and colleagues explain. Melimine is among the first antimicrobial peptides to be tested for clinical use. The study used conventional disposable contact lenses to which melimine was molecularly (covalently) bonded.

Studies in rabbits supported the safety of melimine-coated contact lenses for up to three weeks. There were no signs of toxic effects on the eye, either in terms of inflammation/infection or on the cellular level.

In a subsequent study, human volunteers wore melimine-coated or conventional contact lenses for one day. The coated and uncoated lenses had similar characteristics, including wettability, surface deposits, lens fitting on the center of the eye, lens movement and tightness, and coverage of the cornea. Importantly, there were no differences in redness of the eyean early sign of irritation or inflammation.

No Signs of Safety Problems with Melimine-Coated Lenses in Human Eye

The only significant difference was increased staining of the cornea (the clear outer layer of the eye) caused by melimine-coated lenses. Comfort ratings were similar between the two lensesjust one volunteer reported discomfort with the coated lenses.

No delayed reactions occurred after wearing melimine-coated lenses. The day after they were worn, the lenses were still active against Pseudomonas and Staphylococcus bacteria in culture.

Wearing contaminated contact lenses can cause redness and inflammation of the eye, leading to rare but potentially serious infections. "A contact lens with high antimicrobial activity may inhibit microbial adhesion and consequently reduce theseadverse events," Dr Dutta and coauthors write. Preliminary studies in animals have supported further research and development of contact lenses coated with melimine.

The new results add to previous data on the safety of melimine-coated lenses in animals, and provide initial evidence of their safety and comfort in humans. The lenses also show lasting antimicrobial activity. Dr Dutta and colleagues add, "Whether melimine could reduce contact lens-related adverse events during wear, especially extended wear, requires more clinical trials."

"Practitioners and researchers are hoping to develop new ways to try to reduce rare corneal infections associated with contact lens wear," comments Anthony Adams, OD, PhD, Editor-in-Chief of Optometry and Vision Science. He notes that the melimine-coated contact lenses show broad-spectrum antimicrobial properties, and appear safe and effect against Pseudmonas and Staphylococcus bacteriasome of the major "bad actors" causing corneal infections. Dr Adams adds, "While the study is one of the earlier demonstrations, it does appear to be promising."


Contact: Connie Hughes
Wolters Kluwer Health

Related medicine news :

1. Vanderbilt study finds physical signs of depression common among ICU survivors
2. Study: Altruistic adolescents less likely to become depressed
3. Pilot study suggests ways to widen access to fecal transplants for C. diff infections
4. Moffitt Cancer Centers phase 3 study may be game-changer for acute myeloid leukemia
5. Study identifies enzymes that help fix cancer-causing DNA defects
6. New study finds 2.5 million basketball injuries to high school athletes in 6 seasons
7. US medical innovation needs smarter incentives to cut health spending, study finds
8. First size-based chromatography technique for the study of livi
9. Male health linked to testosterone exposure in womb, study finds
10. Acute respiratory distress syndrome: Study IDs surgical patients at risk
11. Allina Health study shows information sharing between health systems reduces tests
Post Your Comments:
(Date:6/25/2016)... ... 25, 2016 , ... "With 30 hand-drawn hand gesture animations, FCPX users can ... CEO of Pixel Film Studios. , ProHand Cartoon’s package transforms over 1,300 hand-drawn ... X . Simply select a ProHand generator and drag it above media or text ...
(Date:6/25/2016)... ... June 25, 2016 , ... ... recover from injury. Recently, he has implemented orthobiologic procedures as a method for ... is one of the first doctors to perform the treatment. Orthobiologics are substances ...
(Date:6/24/2016)... ... ... A recent article published June 14 on E Online details ... to state that individuals are now more comfortable seeking to undergo not only the ... and cheek reduction. The Los Angeles area medical group, Beverly Hills Physicians (BHP) notes ...
(Date:6/24/2016)... ... June 24, 2016 , ... Marcy was in a crisis. Her son James, eight, ... at his family verbally and physically. , “When something upset him, he couldn’t control his ... it. He would throw rocks at my other children and say he was going to ...
(Date:6/24/2016)... (PRWEB) , ... June 24, 2016 , ... ... now offering micro-osteoperforation for accelerated orthodontic treatment. Dr. Cheng has extensive experience with ... Damon brackets , AcceleDent, and accelerated osteogenic orthodontics. , Micro-osteoperforation is a ...
Breaking Medicine News(10 mins):
(Date:6/26/2016)... Ontario , June 27, 2016  VMS Rehab ... Company,s Board will take whatever measures required to build ... Company,s stock which is currently listed on the OTC ... Wexler, Company Chairman and CEO, "We are seeing an ... difficult to understand, not only by the Company, but ...
(Date:6/24/2016)... , June 24, 2016  Global Blood Therapeutics, ... company developing novel therapeutics for the treatment of ... announced the closing of its previously announced underwritten ... at the public offering price of $18.75 per ... were offered by GBT. GBT estimates net proceeds ...
(Date:6/24/2016)... The Academy of Managed Care Pharmacy (AMCP) ... would allow biopharmaceutical companies to more easily share health ... and coverage decisions, a move that addresses the growing ... The recommendations address restrictions in the sharing of ... label, a prohibition that hinders decision makers from accessing ...
Breaking Medicine Technology: