BS 7394-2:1994
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Complete spectacles Specification for prescription spectacles
Hardcopy , PDF
31-08-2007
English
15-05-1994
Committees responsible
Foreword
Specification
1 Scope
2 References
3 Definitions
4 Lens characteristics
5 Frame characteristics
6 Mechanical characteristics
7 Marking and instructions for use
Annexes
A (informative) Recommendations on the design of
prescription spectacles
B (informative) Recommendations on glazing and
optical quality
C (normative) Determination of LTF
D (normative) Classification of lenses
E (normative) Lens retention test
F (normative) Test for break resistant lenses
G (normative) Test for lenses of increased robustness
Tables
1 Classification of enhanced robustness
D.1 Classification of refractive index
D.2 Classification by constringence
D.3 Classification of photochromic lenses
D.4 Classification by UV absorption
Figures
B.1 Recommended system for visually inspecting a lens
for defects
E.1 Test lever
E.2 Location of the test lever on the test specimen
F.1 Holding device for break resistance and increased
robustness tests
List of references
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