Rat Models of Ocular Hypertension in the MICRON Literature

About the MICRON Research Literature

These research pages organize published studies using MICRON imaging systems by animal species and the disease or condition investigated.

All publication counts and figures reflect the complete indexed research collection.

Explore related studies through the MICRON Research Hubs or search the complete publication collection in the reSEARCH portal.

Understanding Ocular Hypertension

In clinical classification, ocular hypertension is intraocular pressure above the normal range in an eye with no established glaucomatous optic neuropathy: a risk state rather than a disease of the nerve, in which pressure is monitored, sometimes lowered by treatment, and treatment aims at preventing conversion to glaucoma.

In animal work the label names a second thing alongside that clinical state: a deliberate elevation of pressure, performed so that retinal ganglion cell and axonal injury can be produced on an experimental timescale and followed.

Ocular Hypertension in Experimental Research

Where a study did that, its induction method is part of the experimental design rather than a procedural detail.

The routes described in the rodent literature for raising pressure include:

• Microbead or viscoelastic occlusion of the outflow pathway
• Laser photocoagulation of the trabecular meshwork or limbal vessels
• Circumlimbal suture
• Episcleral vein cauterization or sclerosis
• Anterior chamber injection

They differ in how quickly pressure rises, how long it is sustained, how much of the insult is pressure and how much is the procedure itself, and which tissues besides the outflow pathway are disturbed. Pressure can instead be raised by a genotype, in which case its onset and course are set by the animal rather than by the experimenter.

Either way the state is defined by a pressure measurement, and rodent intraocular pressure varies with anesthesia, tonometry method and time of day, so the measurement conditions bear on what a reported elevation means. Where ganglion cell or axonal loss is reported as well, the pressure elevation and the resulting optic neuropathy are recorded under separate labels that one paper often carries together, so this label marks the pressure state rather than the presence or absence of nerve injury.

Rat Models of Ocular Hypertension

The rat offers a larger eye than the mouse while remaining a small-animal model, which eases injection and imaging without moving to a large species.

Published MICRON Research: Ocular Hypertension in Rats

This page lists 11 papers from the MICRON literature, published 2012 to 2026, that study ocular hypertension in rats.

Of these publications:

• 11 studies used rats as the primary ocular hypertension disease model.

Scope of the literature collection: Publication counts reflect studies identified and indexed in the MICRON research corpus. This collection is not intended to represent an exhaustive review of all published ocular hypertension research.

Which imaging and experimental techniques are used in these studies?

Technique counts are paper-level co-occurrences and do not necessarily indicate that a technique was applied to the focal species or focal disease model.

Capabilities and Limitations of Imaging Techniques

A summary of what each imaging technique listed above can measure, the information it provides, and its limitations in research applications.

Optical Coherence Tomography

Optical coherence tomography provides high-resolution, cross-sectional images of ocular tissues in the living eye, allowing researchers to visualize structures at different depths. OCT is particularly useful for measuring tissue thickness, identifying structural abnormalities, and assessing the location and extent of tissue changes.

As a non-invasive imaging technique, OCT enables repeated measurements in the same eye over time, supporting longitudinal studies of disease progression and treatment response. Although OCT provides detailed structural information, it does not directly measure cellular activity or visual function. Tissue that appears structurally normal may still have functional abnormalities, making OCT a valuable companion to functional assessments such as electroretinography (ERG).

Electroretinography

Records the retina's electrical response to light, giving component-sensitive information about outer- and inner-retinal function. It measures function directly, which no structural method does. Full-field ERG sums across the whole retina, so a small lesion can leave the trace unchanged; focal and multifocal variants trade signal amplitude for spatial resolution.

Intravitreal Injection / Delivery

Injection into the vitreous places a substance directly into the vitreous at a known administered dose and chosen time, reducing but not eliminating systemic exposure. The injectate may be a therapeutic compound, cell preparation or viral vector, or an agent used to create the model, such as a toxin, vasoactive or excitotoxic compound, or infectious inoculum. The route bypasses surface-delivery barriers and provides direct access to the vitreous and posterior segment, but the concentration reached in a particular ocular tissue depends on distribution and clearance and is not fixed by the injected dose alone. It is invasive and discrete: each repeat dose or challenge requires another injection, and vehicle- or sham-injected controls can help separate effects of the injectate from effects of the procedure.

Topical Ophthalmic Drug Delivery

A compound applied as drops to the ocular surface. It is non-invasive and repeatable, so it supports frequent dosing without a procedure for each dose. What the route has to establish depends on the target: for an ocular-surface target, residence time and penetration into the surface tissue are the main barriers; for an intraocular anterior-segment target, the compound must cross ocular-surface and corneal or conjunctival barriers and reach an intraocular concentration sufficient for the experiment; for a posterior-segment target, additional ocular barriers separate the surface from the target and posterior-segment exposure is harder to establish.

Optokinetic / Optomotor Response

Measures a reflexive head or eye movement tracking a moving pattern, giving a rapid, training-free behavioral estimate of spatial vision and contrast sensitivity in an animal that cannot report them. It is driven largely by reflex circuitry and reports on the visual pathway as a whole, so a deficit it detects still has to be localized by a structural or electrophysiological method, or separated from cortical processing by an operant task.

Which MICRON systems and add-ons appear?

Which strains and genetic lines are used?

Which other species appear alongside?

What other conditions are recorded on the same papers?

Which MICRON configurations appear in this work?

Configurations recorded in these papers, and the techniques recorded alongside them.

The papers

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