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1From the Departments of Veterinary Clinical Sciences and 2Biomedical Sciences, College of Veterinary Medicine, and the 3Department of Zoology and Genetics, Iowa State University, Ames, Iowa; and the 4Department of Ophthalmology and Visual Sciences, University of Iowa Hospitals and Clinics, Iowa City, Iowa.
PURPOSE. To develop an inducible mouse model of glaucoma.
METHODS. An obstruction of aqueous humor outflow in adult C57BL6/J mice was induced by combined injection of indocyanine green (ICG) dye into the anterior chamber and diode laser treatment. To evaluate intraocular pressure (IOP), tonometry was performed with a modified Goldmann tonometer. The function of the retina was evaluated with electroretinography (ERG).
RESULTS. IOP was significantly elevated in surgical eyes compared with control eyes: before surgery, 15.2 ± 0.6 mm Hg; 10 days after surgery, 33.6 ± 1.5 mm Hg (P < 0.001); and 30 days after surgery, 27.4 ± 1.2 mm Hg (P < 0.001). However, 60 days after surgery, IOP in the surgical eyes decreased to 19.5 ± 0.9 mm Hg and was not significantly different compared with control eyes (control, 17.3 ± 0.7 mm Hg; P = 0.053). ERG amplitudes, expressed as a ratio (surgical/control), were decreased in surgical eyes. The amplitudes for b-wave were: before surgery, 107.6% ± 4.6%; 28 days after surgery, 61% ± 4% (P < 0.001); and 56 days after surgery, 62% ± 5.6% (P < 0.001). Oscillatory potentials were the most dramatically affected: before surgery, 108.6% ± 6.7%; 28 days after surgery, 57.5% ± 5% (P < 0.01); and 56 days after surgery, 57% ± 8.5% (P < 0.001). Amplitudes of the a-waves had relatively smaller but still significant deficits: before surgery, 105.8% ± 6.9%; 28 days after surgery, 72.2% ± 5.4% (P < 0.01); and 56 days after surgery, 79.8% ± 11.0% (P < 0.01). Histologic analysis of the surgical eyes revealed development of anterior synechia, loss of retinal ganglion cells (RGCs), and thinning of all retinal layers. Electron microscopy of optic nerve cross sections revealed swelling and degeneration of the large diameter axons and gliosis.
CONCLUSIONS. Diode laser treatment of ICG saturated episcleral veins causes a chronic elevation of IOP and sustained ERG deficits.
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