Lens Capsule Perforation Without Inflammation in 4 Rabbits From Intravitreal Injection Studies

Veterinary Pathology
Cindy FarmanEvan A Thackaberry

Abstract

Historically, it was thought that lens protein was sequestered, and injury to the lens capsule causing release of lens material into the eye would always result in ocular inflammation. Currently, it is believed that lens antigens are recognized as self, subject to normal T-cell tolerance. Three different single-dose intravitreal injection/implantation studies of 4 different test materials, ranging from 4 to 6 weeks in length, were performed in New Zealand White rabbits. The test materials included polymer microspheres, polymer rods, a solvent, and a hydrogel. Intravitreal injection/implantation procedures were performed on day 1, and indirect ophthalmoscopy and slit-lamp biomicroscopy examinations were performed by board-certified veterinary ophthalmologists periodically throughout the course of each study. None of the affected animals received corticosteroids or other immunomodulatory agents during the course of the studies. Four rabbits had perforation of the posterior lens capsule during the injection/implantation procedure on day 1, visible on clinical ophthalmic examination as lens capsule alterations described as "lens hits" and/or incipient posterior cataracts. Findings on slit-lamp biomicroscopy examination were limited...Continue Reading

References

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Citations

Jan 8, 2020·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·Eleanor Ngwe Nche, Radgonde Amer

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Methods Mentioned

BETA
electron microscopy

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