retina
Enable an agent to recognise a retina, record its anatomical and functional state, and identify what further observation or specialist assessment is needed.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise a retina, record its anatomical and functional state, and identify what further observation or specialist assessment is needed.
The retina is the light-sensitive tissue lining the inner posterior eye in humans and other vertebrates, containing photoreceptors and neural circuits that convert light into signals conveyed to the brain through the optic nerve.
It can be Localise an observation to a specified eye, retinal region, and layer.; Compare retinal measurements across examinations when acquisition and anatomical boundaries are compatible.; Relate structural findings to regional or whole-retina functional observations.; Identify missing coverage, uncertain segmentation, and other limits on interpretation.; Link observed abnormalities to neighbouring disease models without equating an observation with a diagnosis.; Route concerning or unresolved observations for specialist assessment using an applicable clinical workflow..
Distinguishing features
Identify organised light-sensitive neural tissue associated with the eye, rather than treating any photosensitive cell population as a retina.
Distinguish the neural retina from the adjacent pigment epithelium and choroid using tissue identity and anatomical position.
Distinguish retina from optic nerve by the presence of retinal sensory and processing organisation rather than only an axon pathway.
Require species and anatomical context before applying human landmarks such as the macula and fovea.
Distinguish native retinal tissue from a retinal image, organoid, implant, or computational simulation.
Scope
+ Retinal identity, species, eye laterality, and anatomical extent
+ Neural retina and its relationship to retinal pigment epithelium
+ Photoreceptors, retinal neural circuits, and supporting cells
+ Species-appropriate retinal regions, layers, and vascular organisation
+ Local tissue integrity and evidence of retinal function
+ Retinal observations and their acquisition context
- The whole eye and its complete optical system
- The optic nerve beyond its retinal interface and downstream visual pathways
- The choroid, vitreous, and sclera as independently modelled structures
- Retinal diseases as complete diagnostic entities
- Imaging devices, surgical instruments, and retinal prostheses
- Treatment protocols and patient-wide clinical management
Characteristics
- Species
- Taxon identifier and scientific name; unknown Determines which retinal landmarks, cell distributions, and reference measurements apply.
- Eye laterality
- Left; right; unknown; not applicable Prevents observations from different eyes being combined.
- Anatomical inclusion convention
- Neural retina only; neural retina with retinal pigment epithelium; other explicitly defined extent Makes the tissue boundary explicit across anatomical and clinical usage.
- Retinal region
- Species-appropriate named region with localisation method Structure, function, and interpretation vary across the retina.
- Layer thickness
- Micrometres, with layer boundaries, location, and method Supports comparison only when the measured tissue interval is consistent.
- Photoreceptor composition
- Observed or documented photoreceptor classes, distribution, and uncertainty Connects retinal organisation to the sensory capabilities appropriate to the species.
- Attachment state
- Attached; partly detached; detached; indeterminate, with location and extent Records whether neural retinal tissue maintains its normal supporting interface.
- Vascular organisation
- Species-appropriate pattern; observed regional vessels; unknown Prevents one species' vascular anatomy from being assumed universal.
- Electrophysiological response
- Amplitude in microvolts and timing in milliseconds, with stimulus and recording protocol Records functional evidence whose meaning depends on acquisition conditions.
- Observation context
- Linked examination, image, recording, or specimen with date and method Separates observed tissue properties from interpretation and supports longitudinal comparison.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 9 layers · 14 findings · 25 questions.
Retinal identity and boundaries Establishes which retina is represented and which tissues the representation includes.
Retinal anatomy depends on species, and usage differs over whether pigment epithelium is included.
Biological identity
Identifies the organism, eye, and biological context.
Species, eye, and tissue context
Record species, laterality, and whether the represented tissue is in situ or an isolated specimen.
- Which species and eye does this retina belong to? definition
- What record establishes the tissue's identity and its in situ or specimen context? provenance
Anatomical extent
Defines inclusion of neural retina, pigment epithelium, and adjoining interfaces.
Retinal tissue inclusion
Specify the anatomical convention and distinguish included tissue from adjacent structures.
- Does this representation include retinal pigment epithelium or only neural retina? boundary
- Where are its boundaries with the vitreous, choroid, and optic nerve defined? boundary
Regional and cellular organisation Describes retinal position, layering, and sensory and neural composition.
A retinal observation cannot be interpreted reliably without knowing its region and tissue components.
Retinal topography
Locates observations using landmarks appropriate to the species.
Landmarks and regional location
Record anatomical landmarks and coordinate conventions without assuming human specialisations are universal.
- Which landmarks are present and appropriate for locating findings in this species? definition
- How is the finding positioned relative to those landmarks, including orientation and distance units? measurement
Retinal layers and cells
Records layer organisation and the distribution of sensory, neural, and supporting cells.
Layer and cell identification
Identify the represented layers and cell classes while separating direct observation from inferred identity.
- Which photoreceptor, neuronal, and supporting cell classes are represented in the observed region? definition
- What method supports each layer or cell identification, and which identifications remain uncertain? provenance
- Which anatomical boundaries and sampling area define any reported thickness or cell density? measurement
Sensory processing and support Connects light detection and retinal signalling with the tissue interfaces that support them.
Retinal function depends on both neural organisation and supporting tissue relationships.
Light response and neural output
Captures evidence of sensory response and retinal signal processing.
Retinal functional evidence
Record functional observations with their stimulus conditions and limits of anatomical attribution.
- Which retinal response was measured, with what stimulus, adaptation state, and recording protocol? measurement
- Does the evidence represent a local retinal region, a broad retinal response, or visual performance involving downstream pathways? boundary
Supporting interfaces and supply
Records pigment epithelial relationships and species-appropriate vascular support.
Retinal support relationships
Represent retinal relationships to pigment epithelium and vascular supply without absorbing neighbouring tissues into the model.
- Which supporting interfaces and vascular arrangements apply to this retinal region and species? definition
- What observations establish the condition of those interfaces and any assessed perfusion? provenance
Retinal condition and assessment Organises observed tissue integrity, examination limitations, and changes over time.
Agents must distinguish a retinal abnormality from an acquisition artefact and recognise when evidence is insufficient.
Structural integrity
Records attachment, continuity, and local structural abnormalities.
Local integrity and abnormalities
Describe attachment changes, breaks, fluid, haemorrhage, or tissue loss by location and evidence rather than assigning an unsupported diagnosis.
- What structural abnormality is observed, in which layer or interface, and over what extent? measurement
- What evidence supports the recorded attachment and tissue continuity state? provenance
- Which observed features meet an applicable workflow's criteria for specialist review? action
Observation quality and change
Tracks examination coverage, artefacts, and comparability across time.
Retinal evidence comparability
Record whether observations cover the same tissue and whether acquisition differences could explain apparent change.
- Which retinal regions were examined, and where do opacity, artefacts, or segmentation uncertainty limit assessment? boundary
- Are repeated observations aligned to the same region and measured using compatible methods? measurement
- What additional observation would resolve an apparent change or an unassessed region? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- The intended sense is anatomical, with human and other vertebrate retinas as the scope; invertebrate retinal organisation can differ substantially.
- Retinal thickness depends on species, anatomical location, measurement method and whether the retinal pigment epithelium is included.
- This is a recall-based description; no sources were consulted.
- Which of these check these first hold for the sense of retina this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Initiates vision through phototransduction in rod and cone photoreceptors.
- Processes visual information locally before retinal ganglion cells transmit signals to the brain.
- Supports dim-light vision primarily through rods and colour vision and fine spatial discrimination primarily through cones.
- Provides tissue that can be examined and imaged to assess ocular and systemic disease.
- Which of these real-world use hold for the sense of retina this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Human retinal thickness - Approximately 0.1-0.5, depending on location and which tissue boundaries are included - mm
- Which of these typical measurements hold for the sense of retina this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Retinal detachment separates the neurosensory retina from the underlying retinal pigment epithelium and can cause vision loss.
- Vascular occlusion or impaired perfusion can injure retinal tissue.
- Diabetic retinopathy damages retinal blood vessels and can produce oedema, haemorrhage and abnormal vessel growth.
- Inherited retinal degenerations can progressively impair photoreceptor function.
- Excessive optical radiation, including intense laser exposure, can damage the retina.
- Which of these failure modes and hazards hold for the sense of retina this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Within the human retina, the central fovea is specialised for high-acuity vision, whereas much of the peripheral retina supports greater sensitivity in dim light.
- The optic disc contains exiting ganglion-cell axons and lacks photoreceptors, producing the physiological blind spot.
- Which of these regional variation hold for the sense of retina this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- retinal pigment epithelium - The supporting pigmented epithelial layer adjacent to photoreceptors; it is distinguished from the neurosensory retina, although broader anatomical definitions include both.
- choroid - The vascular tissue external to the retinal pigment epithelium that supplies the outer retina; it is not the light-sensing neural tissue.
- macula - A specialised central region of the human retina, not the entire retina.
- optic nerve - The bundle of retinal ganglion-cell axons carrying signals toward the brain, rather than the retinal tissue that detects and processes light.
- cornea - The transparent anterior surface that helps focus incoming light, rather than the posterior tissue that detects it.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of retina this model covers, and on what evidence? provenance
What the second pass must settle
- Should registry entry vr.tr.retina cover vertebrate retinas only, or also retinal structures in invertebrate eyes?
- Which authoritative anatomical convention should determine whether retinal pigment epithelium belongs inside this model?
- Which species-specific extensions are needed for landmarks, photoreceptor classes, and vascular organisation?
- Which measurement protocols and reference populations support interpretation of thickness and electrophysiological responses?
- Should retinal organoids and engineered retinal tissue be linked as neighbouring concepts or admitted as explicitly qualified instances?