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BS 2738-1:1989 - Spectacle lenses - Specification for tolerances on optical properties of mounted spectacle lenses

Description Printed version of this is available at library. To request, please e-mail to referencepk@usm.my and include a copy of this record in your e-mail. Abstract Type of Lenses Covered: Applies to mounted spectacle lenses, meaning lenses that have been cut, edged, and fitted into frames. Optical Property Tolerances: Defines acceptable limits for: Spherical and cylindrical power variations Astigmatism and prismatic effects Axis alignment for cylindrical lenses Purpose: Ensures that lenses maintain their optical performance after being mounted in frames, preventing distortions or misalignment that could affect vision. Application: Used by opticians, eyewear manufacturers, and quality control labs to verify that spectacle lenses meet optical performance standards after being fitted into frames.

Contributor(s): NAAR - Data Entry Person Primary Item Type: British Standard Identifiers: ISBN 0580169375 ICS 11.040.70 Ophthalmic equipment Language: English Subject Keywords: Tolerances of position; Marks; Ophthalmology; Tolerances (measurement); Fitting; Angular tolerances; Test equipment; Defects; Ophthalmic equipment; Visual inspection (testing); Focal length First presented to the public: 3/12/2025 Original Publication Date: 2/28/1989 Previously Published By: British Standards Institution Place Of Publication: London, United Kingdom Citation: Extents: Number of Pages - 8 License Grantor / Date Granted:   / ( View License ) Date Deposited 2022-02-23 12:05:19.399 Submitter: Nurul Aini Abdul Rahman

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