Overview
ISO 14730:2014 - "Ophthalmic optics - Contact lens care products - Antimicrobial preservative efficacy testing and guidance on determining discard date" defines a standardized test method for evaluating the antimicrobial preservative activity of preserved multidose contact lens care products (CLCP). The standard sets out the test principle (initial microbial challenge and a 14‑day rechallenge), sampling schedule, storage conditions and requirements for neutralization or removal of residual antimicrobials. Informative annexes provide example procedures for determining product discard date (including membrane filtration and extended‑dating approaches).
Key topics and technical requirements
- Scope: Applies to preserved multidose contact lens solutions (up to a 28‑day discard date). Excludes single‑use sterile unit doses and containers with physical contamination barriers (e.g., aerosols).
- Test principle: Inoculate product with specified microorganisms, store at controlled temperature, sample at defined intervals and monitor viable counts to confirm preservative activity and prevention of regrowth.
- Sampling and replication: Three product lots are tested; each lot uses a separate inoculum preparation per challenge organism.
- Challenge organisms: Standard test strains specified (including common bacteria, yeast and mould used in preservative testing).
- Timing and conditions: Sampling includes key time points (including day 7, day 14, and post‑rechallenge at day 21 and day 28); storage at 20 °C to 25 °C and protection from light if product is photosensitive.
- Neutralization and recovery: Validated neutralizing agents or membrane filtration are required to remove or inactivate residual antimicrobials prior to plating; effectiveness of neutralization must be validated.
- Performance criteria and reporting: Performance requirements are provided in the standard (see clause 5.6) and full test reporting requirements are specified.
Practical applications and users
Who uses ISO 14730:2014:
- Contact lens solution manufacturers (R&D and quality control) for product development and batch release.
- Independent microbiology and contract test laboratories performing preservative efficacy testing.
- Regulatory affairs teams preparing safety and labeling documentation (discard/use‑after‑opening dates).
- Clinical safety assessors and post‑market surveillance teams evaluating preservative performance.
Practical use cases:
- Demonstrating that a multidose CLCP maintains antimicrobial activity during intended use.
- Supporting decisions on discard dates (up to 28 days) and using annex procedures to justify extended dating.
- Standardizing preservative efficacy data for regulatory submissions and product labeling.
Related standards
- ISO 14534 - Contact lenses and contact lens care products: fundamental requirements
- ISO 18369‑1 - Contact lenses: vocabulary, classification and labelling recommendations
Keywords: ISO 14730:2014, contact lens care products, preservative efficacy testing, antimicrobial preservative, discard date, multidose contact lens solution, ophthalmic optics.
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