Abstract: Lit review of ocular surface harm from eyedrops.

Wish I had access to the full study. The finding/summary points are such important things to keep in mind. I find myself getting more and more routinely concerned about potential harm from overdoing pharmaceutical dry eye therapies. Obviously there is no clear-cut answer to determining what's causing what - but there is good solid reason to go slow, not do too much at once, and observe carefully for changes.

Ocular surface damage by ophthalmic compounds.

PURPOSE OF REVIEW:
To describe the changes of the ocular surface following chronic use of eye drop therapies. The possible pathogenetic mechanisms responsible for specific signs and symptoms are described and discussed.

RECENT FINDINGS:
Topical treatments for ocular diseases may trigger an inflammatory response in predisposed patients, with local activation of immune cells and ocular surface damage. The resulting clinical picture may vary substantially, from mild to severe, sharing a red eye as a hallmark presentation. Recent in-vitro, in-vivo, and clinical data suggest that these detrimental effects are not solely related to eye drop preservatives and may be caused by the medication itself, especially for patients with preexisting ocular diseases. However, no specific tests are currently available to make a clear cut diagnosis between what is caused by the disease and what is the effect of its therapy. Patients' history and clinical features remain essential to hypothesize the underlying pathogenetic mechanism.

SUMMARY:
Topical therapies may induce ocular surface allergic reactions, dry eye-like reactions, and epithelial damage. Patients in need of chronic therapies are at higher risk of facing these detrimental effects of eye drop therapies and should be treated with unpreserved compounds.

Curr Opin Allergy Clin Immunol. 2011 Aug 4. [Epub ahead of print]
Mantelli F, Tranchina L, Lambiase A, Bonini S.
Source
aDepartment of Ophthalmology, Campus Bio-Medico, University of Rome bDepartment of Biopathology, Ophthalmology Division, UOSD Glaucoma, University of Rome 'Tor Vergata', Rome, Italy.