Stories about: contact lenses

Drug-eluting contact lens offers hope in glaucoma

Daniel Kohane drug-eluting contact lens
Contact lenses ringed with a drug-bearing polymer film provided gradual, sustained drug release in this preclinical study, potentially offering an alternative to eye drops.

Daily medicated eye drops are the first line of treatment for glaucoma, the leading cause of irreversible blindness. The drops relieve pressure in the eye, a significant risk factor for glaucoma. But they’re not ideal: their delivery is imprecise, they can cause stinging and burning and patients often struggle to administer them. Adherence is poor: in one study based on insurance claims data, nearly half of patients who had filled a glaucoma prescription stopped topical glaucoma therapy within six months.

Engineered contact lenses dispensing glaucoma medication gradually could vastly improve adherence, helping hang onto their eyesight longer. In a pre-clinical study of glaucoma published online this week in the journal Ophthalmology, slow-release lenses lowered eye pressure at least as well as daily eye drops containing the drug latanoprost — and, in a higher-dose form, possibly more so.

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Stopping blindness: The drug-eluting contact lens

drug-eluting contact lens
(John Earle Photography)

Growing up, my grandmother’s eyes were always a problem. For years, she was losing her central vision to glaucoma, and numerous surgeries and treatments did not seem to help. Later in life, she could not see my face but could always tell who I was when I was close.

Glaucoma is the leading cause of irreversible blindness worldwide. While FDA-approved medications such as latanoprost can prevent vision loss by reducing pressure in the eye, their beneficial effects are limited by poor patient compliance: At six months of treatment, compliance is estimated to be little more than 50 percent.

Why? First, the medications are typically delivered as eye drops, and the drops themselves can cause stinging and burning. The drops also contain preservatives that can cause ocular surface disease.

Perhaps most importantly, latanoprost and other glaucoma drugs halt the disease’s progression but do not reverse it. Taking the drugs does not provide positive feedback that will motivate patients, such as relieving pain.

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