Mouse Models of Anophthalmia and Microphthalmia 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 Anophthalmia and Microphthalmia

Anophthalmia and microphthalmia are failures of eye formation rather than damage to an eye that formed, and the label covers two origins rather than one.

Where specification and shaping of the optic vesicle and optic cup are disturbed, the result is a graded spectrum running from a rudimentary globe to an eye that is clinically absent. At the severe end, clinical anophthalmia can represent true absence of the globe or extreme microphthalmia; external appearance alone may not distinguish them, and orbital imaging is important in defining whether residual ocular tissue is present, with histopathology confirmatory where tissue is available.

Where the optic cup forms and the eye is grossly well organized, what is curtailed instead is the ocular growth that follows, and the result is a globe of reduced axial length:

• Nanophthalmos, in which the eye is small throughout
• Posterior microphthalmia, in which the shortening falls on the posterior segment

An eye shortened in either way is described as hyperopic. A disorder of growth in a cup that formed is a different lesion from an arrest of cup specification, and reduced dimensions by themselves do not date an eye to one account or the other.

Mutations in transcription factors that pattern the early eye field are an established cause at the patterning end; the defect occurs both in isolation and as one feature of a syndrome, can be unilateral or bilateral, and can differ in severity between the two eyes of one individual.

Anophthalmia and Microphthalmia in Experimental Research

What a mouse model supplies, where the model is genetic, is those developmental sequences in a manipulable form: which gene, acting at which stage and at what gene dosage, produces which degree of arrest where patterning fails, and which gene produces which shortfall in the dimensions an eye reaches where growth is what falls short, read out as staged embryonic and postnatal morphology, as ocular biometry, and as the range of severity an allelic series generates.

The severe end of the arrest spectrum sits outside in vivo ocular imaging and retinal electrophysiology, which require transmitting media and a retina to record from, so those readouts address the eyes that do form, the growth disorders among them included, whose axial and internal dimensions and whose retinal layers can be followed in the living animal over time.

Several human endpoints sit outside the model as well:

• Visual acuity
• Orbital and socket growth in a developing child
• The prosthetic and reconstructive management that follows a small or absent eye

Mouse Models of Anophthalmia and Microphthalmia

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: Anophthalmia and Microphthalmia in Mice

This page lists 9 papers from the MICRON literature, published 2016 to 2026, that study anophthalmia or microphthalmia in mice.

Of these publications:

• 9 studies used mice as the primary anophthalmia or microphthalmia 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 anophthalmia or microphthalmia 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.

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.

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.

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.

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.