A Comprehensive Protocol for Microbead-Induced Ocular Hypertension in Mice

Glaucoma is a common optic neuropathy characterized by degeneration of retinal ganglion cells (RGCs). Elevated intraocular pressure (IOP), that is, ocular hypertension, is the primary modifiable risk factor for glaucoma and the primary characteristic of most preclinical glaucoma models. Extensive genotype and phenotype diversity at relatively low cost and high accessibility makes laboratory mice an excellent preclinical model for glaucoma. The microbead occlusion model was introduced in 2010 as an inducible model of ocular hypertension in mice and is now one of the most extensively utilized models of rodent glaucoma. Subsequent modifications of the microbead model increased the magnitude and duration of IOP elevation, primarily through modification of injection materials. Despite its popularity, accessibility of the model is hindered by procedural consistency between users. Here we outline an updated and comprehensive protocol for execution of the microbead model that is focused on improving surgical and outcome measure consistency and on enabling single experimenter execution.