Mouse Models of Corneal Opacity and Scarring 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 Corneal Opacity and Scarring

Corneal opacity is loss of the cornea's transparency, and that transparency is a maintained state rather than a given: it rests on regularly spaced, small-diameter collagen fibrils in an ordered stroma, on stromal hydration held low by the endothelium, on a smooth epithelium renewed from the limbus, and on a tissue that stays avascular.

Several different insults disturb that state and leave the tissue scattering light rather than transmitting it, among them:

• Fibrotic repair after wounding, in which keratocytes become myofibroblasts and deposit disorganized matrix
• Edema
• Vessel ingrowth
• Infection and the inflammation that follows it
• Failure of the limbal epithelial supply
• Maldevelopment of the anterior segment

Whether corneal scarring is better read as a phase of corneal wound healing or as an entity that outlasts it is argued both ways in the literature and is not settled here. What both readings share is that the thing measured is loss of transparency, and that it can persist after an epithelial defect has closed.

Corneal Opacity and Scarring in Experimental Research

Corneal opacity is studied through induced models, genetic models and background or spontaneous phenotypes. In an induced model, an insult can be delivered to a chosen site, depth and area at a known time; genetic models instead allow developmental and fibrotic pathways to be altered without a dated injury. Either way the tissue sits on the outside of the eye, so the haze can be graded by external examination, sectioned optically and followed in the same eye over weeks, and a treatment can be applied to that same surface.

A cornea can also cloud as a background or spontaneous phenotype in an animal population, without an ocular lesion being deliberately induced or a genetic manipulation being introduced specifically to create the opacity. Work of that kind reports what the population develops rather than the response to a placed lesion or an engineered disease model.

What none of these preparations supplies is how opacity is judged in people, because it matters there through the image it degrades: acuity, contrast sensitivity and glare measured through a scarred visual axis require a subject who reports what they see. A mouse cornea is also far thinner and differently proportioned from a human cornea, so injury depth and scar severity do not transfer one to one.

Mouse Models of Corneal Opacity and Scarring

The mouse carries most of this work.

Transgenic and knockout lines allow a pathway to be removed or overexpressed, and cost, availability, short generation time and a large body of background data reinforce the choice.

A genetic manipulation constrains rather than isolates a mechanism: developmental compensation and pleiotropy remain possible.

Published MICRON Research: Corneal Opacity and Scarring in Mice

This page lists 25 papers from the MICRON literature, published 2012 to 2026, that study corneal opacity or scarring in mice.

Of these publications:

• 23 studies used mice as the primary corneal opacity or scarring disease model.
• 2 studies used healthy animals to assess pharmacokinetics, drug delivery, or tolerability.

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 corneal opacity or scarring 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).

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.

Fundus Fluorescein Angiography

Fundus fluorescein angiography uses an injected fluorescent dye to visualize blood flow through the retinal and choroidal circulation. Sequential images show how vessels fill, identify areas of reduced or absent perfusion, and reveal dye leakage associated with vascular abnormalities.

This technique is particularly useful for evaluating vascular perfusion, blood-retinal barrier integrity, and abnormal vessel growth. Fluorescein angiography primarily shows dye distribution rather than the surrounding retinal tissue. It provides a two-dimensional (en face) view in which vessels at different depths may overlap. Cross-sectional and cellular structural details require other imaging methods, such as optical coherence tomography (OCT) or optical coherence tomography angiography (OCT-A). Vascular abnormalities that do not affect dye filling or produce leakage may also remain undetected.

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.

CRISPR-Based Ocular Gene Editing

Uses a programmable genome-editing system to alter DNA at an endogenous locus rather than adding a separate replacement copy. Depending on the editor and design, it can disrupt, correct or install a sequence, either therapeutically or to create an experimental model. Once a genomic sequence change is established, the edit itself cannot be withdrawn like a dose; where the edit is present from conception, the resulting phenotype also reflects its effects throughout development. Off-target sequence changes are a separate question that structural imaging does not establish.

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.

Laser Photocoagulation Models

A laser lesion provokes a reproducible, quantifiable injury at a known time and place. Wavelength, power, duration, spot size, pulse mode, focus and lesion location together determine the injury produced, allowing laser exposure to be configured for different experimental endpoints. It is an induced injury, not the disease: it produces a lesion directly, bypassing the process that gives rise to comparable damage in patients.

Ocular Blast Injury

Experimental ocular blast models expose the eye, or in some paradigms the head with ocular outcomes measured, to a controlled overpressure wave at a known time. Peak pressure, waveform and impulse, exposure number, orientation and interval help determine the loading delivered to the eye. A blast wave can injure multiple ocular compartments, including anterior structures, retina and optic nerve, although the pattern and severity depend on the exposure paradigm and the animal. Eye-directed paradigms that shield the head and body are used to isolate primary blast effects on the eye; head-directed or less-confined paradigms may also involve central nervous-system and other traumatic-brain-injury mechanisms and should not be treated as equivalent. Because the exposure is known, interventions can be tested against it and sham exposures can help distinguish effects of the pressure wave from handling or the experimental procedure. Apparatus design, waveform, positioning and shielding materially affect the delivered exposure, so nominal pressure values or exposure counts should not be assumed directly comparable across laboratories or equivalent to human blast exposure without physical characterization.

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

Browse all hubs at MICRON Research Hubs. The full corpus is searchable in the reSEARCH portal.