BS 7522-2:1993
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Low vision aids Specification for spectacle magnifiers and similar devices
Hardcopy
15-11-2000
English
15-03-1993
Committees responsible
Foreword
Specification
1. Scope
2. References
3. Definitions
4. Classification
5. Frames, mounts, head-bands and screw threads
6. Performance characteristics
7. Optical characteristics
8. Physical characteristics
9. Marking, packaging and information to be provided
by the manufacturer
Annexes
A. (informative) Recommendations regarding subjective
characteristics of spectacle magnifiers
B. (normative) Corrosion test using simulated
perspiration solution
C. (normative) Determination of equivalent power
D. (normative) Determination of distortion
E. (normative) Determination of diffusion
F. (normative) Determination of transmittance
G. (normative) Impact resistance test
H. (normative) Determination of ignitability (heated
rod test)
Tables
1. Permissible levels of distortion
Figures
A.1 Recommended system for visually inspecting for
defects
D.1 Distortion assessment charts
D.2 Arrangement for the determination of distortion
E.1 Diffusion angles
E.2 Arrangement of apparatus for measurement of
diffusion
List of references
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