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Nanodiamond-embedded contact lenses may improve glaucoma treatment
Date:2/18/2014

ase of medication into the eye, the UCLA researchers combined nanodiamonds with timolol maleate, which is commonly used in eye drops to manage glaucoma. When applied to the nanodiamond-embedded lenses, timolol is released when it comes into contact with lysozyme, an enzyme that is abundant in tears.

"Delivering timolol through exposure to tears may prevent premature drug release when the contact lenses are in storage and may serve as a smarter route toward drug delivery from a contact lens." said Kangyi Zhang, co-first author of the study and a graduate student in Ho's lab.

One of the drawbacks of traditional timolol maleate drops is that as little as 5 percent of the drug actually reaches the intended site. Another disadvantage is burst release, where a majority of the drug is delivered too quickly, which can cause significant amounts of the drug to "leak" or spill out of the eye and, in the most serious cases, can cause complications such as an irregular heartbeat. Drops also can be uncomfortable to administer, which leads many patients to stop using their medication.

But the contact lenses developed by the UCLA team successfully avoided the burst release effect. The activity of the released timolol was verified by a primary human-cell study.

"In addition to nanodiamonds' promise as triggered drug-delivery agents for eye diseases, they can also make the contact lenses more durable during the course of insertion, use and removal, and more comfortable to wear," said Ho, who is also a professor of bioengineering and a member of the Jonsson Comprehensive Cancer Center and the California NanoSystems Institute.

Even with the nanodiamonds embedded, the lenses still possessed favorable levels of optical clarity. And, although mechanical testing verified that they were stronger than normal lenses, there were no apparent changes to water content, meaning that the contact lenses' comfort and permeability to oxygen wou
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Contact: Brianna Deane
bdeane@dentistry.ucla.edu
310-206-0835
University of California - Los Angeles
Source:Eurekalert

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