BS 2738-1:1989
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
View Superseded by
Spectacle lenses Specification for tolerances on optical properties of mounted spectacle lenses
Hardcopy , PDF
15-11-1998
English
28-02-1989
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Foreword
Committees responsible
Specification
1. Scope
2. Definitions
3. Lens power
4. Addition power of all lenses
5. Cylinder axes
6. Lens positioning and optical centration
7. Prismatic power
8. Multifocal lenses
9. Marking
Appendix
A. Recommendations regarding subjective characteristics
of spectacle lenses
Tables
1. Lens power
2. Cylinder axes
3. Base setting of prisms
4. Prismatic power
Figures
1. Positions for determining, by use of a focimeter,
the addition power of a front surface multifocal
or progressive power lens
2. Recommended system for visually inspecting a lens
for defects
3. Front view of round lenses illustrating marks
(exaggerated) on back surfaces denoting right and
left
Permitted tolerances on prescribed lens power, cylinder axes, optical centration and prismatic power of spectacle lenses ready for wear. Marking requirements are specified and recommendations are given regarding subjective characteristics.
| Committee |
CH/172
|
| DevelopmentNote |
Approved under the UK Consumer Protection Act 1987
|
| DocumentType |
Standard
|
| Pages |
12
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
| BS 7394-1:1991 | Complete spectacles Specification for ready-to-wear near-vision spectacles |
| BS 2738-2:1989 | Spectacle lenses Specification for tolerances on optical properties of uncut finished lenses |
| BS 5883:1996 | Specification for surface swimming goggles |
| BS 7394-1:1996 | Complete spectacles Specification for ready-to-wear near-vision spectacles |
| BS 7394-2:1994 | Complete spectacles Specification for prescription spectacles |
| BS 3521-2:1991+A1:1996 | Terms relating to ophthalmic lenses and spectacle frames Glossary of terms relating to spectacle frames |
| BS 2738-2:1989 | Spectacle lenses Specification for tolerances on optical properties of uncut finished lenses |
| BS 3521-1:1991 | Terms relating to ophthalmic lenses and spectacle frames Glossary of terms relating to ophthalmic lenses |
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