BS 2738-7(1996) : 1996 AMD 9760
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
11-15-1997
11-23-2012
Committees responsible
National foreword
Specification
1 Scope
2 Normative references
3 Definitions
4 Classification
5 Requirements
6 Test methods
7 Marking
8 Identification
9 Reference to this part of ISO 8980
Annexes
A (informative) Material and surface quality
B (informative) Method for evaluating progressive
addition lens characteristics
Tables
1 Tolerances on the power of lenses
2 Tolerances on the direction of cylinder axis
3 Tolerances on the addition power
4 Tolerances on optical centration and prismatic power
Figures
A.1 Recommended system for visually inspecting a lens
for defects
B.1 Measurement of the optical characteristics in the
as-worn position
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