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A Laser-induced Mouse Model of Chronic Ocular Hypertension to Characterize Visual Defects
Published on: August 14, 2013
Changes in visual fields and lateral geniculate nucleus in monkey laser-induced high intraocular pressure model
Masaaki Sasaoka1, Katsuki Nakamura, Masamitsu Shimazawa
1Department of Behavioral and Brain Sciences, Primate Research Institute, Kyoto University, 41-2 Kanrin, Inuyama, Aichi 484-8506, Japan.
Experimental Eye Research
|April 2, 2008
Summary
High intraocular pressure in monkey eyes damages the visual pathway, affecting visual field sensitivity and retinal ganglion cells. Glaucoma may cause glial changes in the central nervous system, similar to other neurodegenerative diseases.
Area of Science:
- Ophthalmology
- Neuroscience
- Glaucoma Research
Background:
- Monkey eyes share histological and functional similarities with human eyes, making them valuable for ophthalmologic research.
- The laser-induced high intraocular pressure (IOP) model in monkeys is frequently used to study glaucoma.
- Previous studies have investigated visual field, retinal ganglion cell (RGC), and lateral geniculate nucleus (LGN) changes in this model, but lacked integrated analysis.
Purpose of the Study:
- To establish clear relationships among visual field changes, RGC counts, and LGN alterations in a single monkey model of high IOP.
- To investigate glial changes in the LGN using glial fibrous acidic protein (GFAP) immunohistochemistry in response to elevated IOP.
Main Methods:
- Two monkeys with laser-induced high IOP were analyzed.
- Evaluated visual field sensitivity, RGC numbers, and LGN neuronal density.
- Performed GFAP immunohistochemistry on the LGN to assess glial responses.
Main Results:
- High IOP led to decreased visual field sensitivity, RGC number, and LGN neuronal density.
- The correlation between RGC loss and visual field sensitivity reduction varied with eccentricity from the fovea.
- Increased GFAP expression was observed in LGN layers receiving input from the high IOP eye compared to the untreated eye.
Conclusions:
- Glaucoma may induce glial function alterations extending beyond the retina into the central visual pathway.
- Elevated IOP in glaucoma could lead to central nervous system changes, potentially serving as a marker for neuropathy akin to other neurodegenerative conditions.
