BS 2738-2:1989
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Spectacle lenses Specification for tolerances on optical properties of uncut finished lenses
Hardcopy , PDF
08-15-1996
English
02-28-1989
Foreword
Committees responsible
Specification
1. Scope
2. Definitions
3. Lens power
4. Addition power of all lenses
5. Cylinder axes
6. Optical centration
7. Prismatic power
8. Geometrical tolerances
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
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