Foreword
1 Scope
2 Normative references
3 Test for spherical, astigmatic and prismatic
refractive powers
3.1 Testing unmounted oculars covering one eye
3.2 Testing unmounted oculars covering both eyes and
mounted oculars (spectacles, goggles and
face-shields)
4 Light diffusion test
4.1 Principle
4.2 Test methods
5 Assessment of quality of material and surface
6 Determination of transmittance
7 Determination of variations in luminous transmittance
7.1 Unmounted oculars covering one eye
7.2 Mounted oculars and unmounted oculars covering both
eyes
7.3 Method to correct transmittance for variations
in thickness of the ocular
8 Determination of spectral reflectance in infrared
Annex A (normative) Method for measuring spherical and
astigmatic refractive powers over small areas
A.1 Principle
A.2 Apparatus
A.3 Measurements
Annex B (informative) Uncertainty of measurement and results
interpretation
B.1 Test report and uncertainty of measurement
Annex ZA (informative) Clauses of this European Standard
addressing essential requirements or other provisions
of EU Directives