contact lens
Enable an AI agent to recognise a contact lens, assess its documented suitability and current condition, and identify which handling or use actions are supported by available evidence.
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.
Researched by: Codex
Purpose and description
Enable an AI agent to recognise a contact lens, assess its documented suitability and current condition, and identify which handling or use actions are supported by available evidence.
It can be Identify the lens and associate it with its source package and product instructions.; Compare documented optical and fitting properties with the intended wearer and eye.; Inspect and record visible condition, orientation and unresolved identity questions.; Track opening, wear, removal, storage, care and replacement events.; Evaluate a proposed handling or wear action against documented instructions and fitting constraints.; Flag the lens for withheld use, professional review, replacement or disposal when the evidence supports that disposition..
Distinguishing features
Designed to be worn directly on the eye, rather than supported in a spectacle frame in front of it.
An externally applied lens, rather than a surgically implanted intraocular lens.
Has a defined lens body with ocular fitting geometry, rather than being an eye drop, ointment or cleaning solution.
May have corrective, cosmetic or therapeutic intent; absence of corrective power does not by itself exclude a contact lens.
A prescription, package or product listing describes or contains a contact lens but is not itself the individual lens.
Scope
+ Lens identity, material, geometry and intended function
+ Optical properties and orientation requirements
+ Relationship to a particular wearer, eye and documented fitting
+ Packaging, opening, wear, care and replacement history
+ Observed condition and evidence governing further handling or use
- The wearer's complete eye anatomy, diagnoses and medical history
- Clinical examination, prescribing and treatment decisions
- Spectacles, spectacle lenses and intraocular implants
- Care solutions, storage cases and insertion tools as independent products
- Retail orders, insurance coverage and appointment management
Characteristics
- Design family
- Soft, rigid corneal, scleral, hybrid, other documented design, unknown Determines which geometry, fitting and care information is relevant.
- Intended function
- Refractive correction, cosmetic appearance, therapeutic protection, corneal reshaping, other documented function; multiple values permitted Prevents judging every lens solely by its corrective power.
- Material designation
- Documented material name and material family, or unknown Connects the lens to applicable manufacturer specifications and care compatibility.
- Optical prescription
- Sphere, cylinder and addition in dioptres; axis in degrees; design-specific optical parameters where applicable Supports comparison with the intended eye's documented optical requirements.
- Fitting geometry
- Diameter and labelled base curve in millimetres; sagittal depth and peripheral geometry with explicit units where applicable Identifies fitting parameters without treating matching numbers as proof of equivalent fit.
- Wearer and eye assignment
- Reference to wearer, right or left eye, applicable prescription and fitting record Separates physical identity from suitability for a particular eye.
- Product provenance
- Manufacturer, product designation, lot or serial identifier when available, and source package Supports verification of specifications, expiry and product-specific restrictions.
- Wear and replacement regimen
- Documented permitted wear pattern, replacement interval, interval trigger and governing instruction Distinguishes a wear session from the lens's total permitted service period.
- Lifecycle position
- Sealed, opened, stored, being worn, removed, withheld from use, discarded, unknown Determines which history and checks matter before a proposed action.
- Observed physical condition
- Documented observations of integrity, deposits, discoloration, deformation and hydration where applicable; observation time and uncertainty Keeps observed condition distinct from an unsupported conclusion that the lens is fit for use.
- Care and exposure history
- References to cleaning, disinfection, storage and exposure events, including unknown periods Makes handling history available when evaluating continued use.
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 · 10 layers · 10 findings · 23 questions.
Lens identity and design Establishes what kind of contact lens this is and which product-level claims apply to it.
Appearance alone may not reveal a lens's material, function or source product.
Design and purpose
Distinguishes the lens's physical design from its intended optical, cosmetic or therapeutic role.
Documented lens type
Record design family, material designation and intended functions with their evidence and any unresolved classification.
- Which lens design, material and intended functions are explicitly documented? definition
- What evidence distinguishes this item from a spectacle lens, intraocular implant or non-lens ocular covering? boundary
Individual-to-product link
Connects a physical lens to its identifying package and specifications.
Traceable product identity
Record the product, manufacturer and available batch identifiers without assuming an unpackaged lens remains identifiable.
- Which package, dispensing record or marking establishes this lens's product and lot identity? provenance
- After removal from its package, what evidence preserves or weakens that identity link? provenance
Optical and appearance function Records the lens's optical specification and any intentional appearance effects.
Lenses with similar appearance may differ in power, optical zones, orientation requirements or cosmetic purpose.
Optical specification
Captures the optical parameters relevant to the documented lens design.
Labelled and verified optics
Keep labelled optical values separate from measured values and wearer-reported visual performance.
- What sphere, cylinder, axis, addition or other design-specific optical values are documented, and which are inapplicable? measurement
- Do these values come from packaging, a prescription, a manufacturer specification or an actual measurement of this lens? provenance
Zones, tints and orientation
Describes optical or cosmetic regions and their dependence on lens position.
Functional regions and markings
Record documented optical zones, pigmentation and orientation indicators, including uncertainty about their interpretation.
- Which regions or markings serve optical, cosmetic, handling or orientation functions? definition
- What orientation or centration checks are specified for this design before its performance can be judged? action
Eye interface and fit Relates lens geometry and observed on-eye behaviour to a particular wearer and eye.
Product specifications do not by themselves establish suitability for an individual eye.
Fitting geometry
Records the design-specific dimensions and surfaces involved in fitting.
Geometry with design context
Record dimensions with their definitions, units and source, preserving differences between design families.
- Which diameter, base curve, sagittal depth or peripheral parameters describe this design, and what are their values and units? measurement
- Which parameters are insufficient to establish interchangeability with another lens product? boundary
Wearer-specific fit evidence
Connects the lens to its assigned eye and documented fitting observations.
Assigned eye and observed fit
Reference the applicable fitting record and distinguish professional observations from wearer reports.
- For which wearer and eye was this product and parameter combination prescribed or fitted, and when? provenance
- What observations of centration, movement, rotation or clearance are available for this design, and who assessed them? measurement
- Which proposed changes require a new fitting decision rather than reuse of an existing record? boundary
Wear, care and replacement Tracks the instructions and events that govern the lens's service life.
Wear duration, replacement timing and care requirements are separate constraints that depend on the identified lens.
Wear and replacement clocks
Separates package expiry, opening date, wear sessions and replacement triggers.
Applicable use intervals
Record each documented interval together with its starting event, authority and available history.
- What instructions establish permitted wear patterns, replacement intervals and package expiry? provenance
- Which opening dates, wear sessions and replacement-triggering events are known or missing? measurement
- Does the proposed wear session satisfy each applicable documented constraint? action
Lens-specific care
Connects cleaning, disinfection and storage events to the instructions for this lens.
Care compatibility and completion
Record whether reuse is permitted and, where applicable, which care process was used and completed.
- Do the applicable instructions permit reuse, and which care products and processes do they specify? action
- What evidence records the last care cycle, storage conditions and any required completion or neutralisation step? provenance
Condition and use disposition Combines observations, exposure history and unresolved concerns to support a bounded next action.
An intact-looking lens may still have unknown history, and symptoms during wear cannot be diagnosed from the object alone.
Integrity and exposure
Records physical observations and events that may affect the lens's condition.
Observed defects and history gaps
Record tears, chips, deposits, deformation, drying or relevant exposures without treating an absence of visible defects as verification of suitability.
- What defects or changes were observed, by what method and at what time? measurement
- What contact with water, other substances, surfaces or unidentified storage conditions is documented or unresolved? provenance
Evidence-based next action
Records a proposed disposition and the evidence or missing decision on which it depends.
Use readiness and escalation
Distinguish documented support for an action from unresolved suitability, and link wearer concerns to appropriate clinical review without assigning a diagnosis.
- Which evidence supports wearing, caring for, storing, withholding, replacing or discarding this lens? action
- Which missing records, condition concerns or wearer-reported problems prevent the proposed action from being supported? boundary
- What product instruction or professional decision is needed to resolve the outstanding concern? action
What the second pass must settle
- Does the registry intend this entry to include specialist therapeutic and corneal-reshaping lenses, and are any already owned by another model?
- Which authoritative sources should define minimum geometry and fitting evidence for soft, rigid corneal, scleral and hybrid designs?
- How should conflicting manufacturer instructions, dispensing records and wearer-specific professional directions be represented and resolved?
- What evidence is sufficient to preserve individual lens identity after unpacking, especially when paired lenses look alike?
- Which condition or exposure observations support a defined disposition, and which must remain unresolved pending professional assessment?