Canopy vegetation influences ant (Hymenoptera: Formicidae) communities in headwater stream riparian zones of central Appalachia.

In the eastern United States, eastern hemlock Tusga canadensis (L.) Carriere forests are threatened by the invasive hemlock woolly adelgid, Adelges tsugae, a pest that is causing widespread hemlock mortality. Eastern hemlock is an essential component of forested communities.

Intraocular pressure changes during injection of microincision and conventional intraocular lenses through incisions smaller than 3.0 mm.

Purpose: To compare intraocular pressure (IOP) during insertion of a new microincision intraocular lens (IOL) (Akreos AO MI60) and a conventional IOL (AcrySof Natural SN60AT) and to determine the minimum incision sizes for insertion in a cadaver eye model.

Setting: John A. Moran Eye Center, University of Utah, Salt Lake City, Utah, USA.

Acanthamoeba and fungal keratitis in a woman with a history of Intacs corneal implants.

Purpose: To report a case of corneal perforation secondary to Acanthamoeba and fungal keratitis in a patient with a history of Intacs corneal implants.

Methods: The patient's history, clinical presentation, and pathologic analysis were reviewed.

Results: A 56-year-old woman with keratoconus was referred to the university eye center for a corneal perforation secondary to a chronic corneal ulcer initially diagnosed as herpes simplex keratitis.

Pigmentary dispersion syndrome with a secondary piggyback 3-piece hydrophobic acrylic lens. Case report with clinicopathological correlation.

We describe a case of pigmentary dispersion syndrome resulting from secondary piggyback implantation of a 3-piece hydrophobic acrylic squared-edged intraocular lens (IOL) in the ciliary sulcus. The intraocular pressure remained elevated despite pharmacological treatment, with a heavily pigmented trabecular meshwork. The piggyback IOL was subsequently explanted and replaced by a silicone IOL with smooth round edges.