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Contact lens standards.

D A Hough

    Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association
    |November 24, 2005
    PubMed
    Summary

    The British Standards Institution is publishing new contact lens manufacturing standards based on international data. Adherence to standardized terminology is crucial, despite some authors using outdated terms.

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    Area of Science:

    • Ophthalmic manufacturing standards
    • Contact lens technology
    • Materials science in optics

    Background:

    • The British Standards Institution (BSI) is adopting international and European standards for contact lens manufacturing.
    • Existing standards for rigid and hydrogel lenses rely on reproducibility data from inter-laboratory comparisons ('ring tests').

    Purpose of the Study:

    • To outline the development and basis of new British Standards for contact lens manufacture.
    • To emphasize the importance of consistent terminology in the field of contact lenses.

    Main Methods:

    • Development of standards based on international and European guidelines.
    • Utilization of 'ring test' data, involving measurements by independent operators, to establish tolerance limits for lens manufacture.
    • Review of existing terminology standards, including the 1986 International Standard.

    Main Results:

    • New British Standards for contact lens manufacturing are being published.
    • Tolerance limits for rigid and hydrogel lenses are informed by empirical reproducibility data.
    • Inconsistent use of obsolete terminology persists despite the existence of an international standard.

    Conclusions:

    • The new British Standards aim to harmonize contact lens manufacturing practices.
    • Standardized terminology is essential for clear communication and accurate research in contact lens science.
    • Continued use of outdated terms hinders progress and understanding in the field.

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