BS EN 167:2002 pdf download – Personal eye-protection — Optical test methods 1 Scope This European Standard specifies optical test methods for eye-protectors, the requirements for which are contained in other ENs. Alternative methods may be used if shown to be equivalent. Non-optical test methods are given in EN 1 68. Specifications are given in EN 1 66. A definition of terms is given in EN 1 65. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 1 65, Personal eye-protection — Vocabulary . EN 1 66, Personal eye-protection — Specifications. EN 1 68, Personal eye-protection — Non-optical test methods. 3 Test for spherical, astigmatic and prismatic refractive powers NOTE The reference methods for assessment of refractive power are contained in 3.1 and 3.2. If during measurement using the telescope a doubling or other aberration of the image is observed then the ocular may either be classified as a defective, or subjected to further examination using the method described in annex A. 3.1 Testing unmounted oculars covering one eye 3.1.1 Apparatus 3.1.1.1 Telescope A telescope with an aperture of nominally 20 mm and a magnification between 1 0 and 30, fitted with an adjustable eyepiece incorporating a reticule. 3.1.1.2 Illuminated target A target, consisting of a black plate incorporating the cut-out pattern shown in Figure 1 , behind which is located a light source of adjustable luminance with a condenser, if necessary, to focus the magnified image of the light source on the telescope objective. The large annulus of the target has an outer diameter of (23,0 ± 0,1 ) mm with an annular aperture of (0,6 ± 0,1 ) mm. The small annulus has an inner diameter of (1 1 ,0 ± 0,1 ) mm with an annular aperture of (0,6 ± 0,1 ) mm. The central aperture has a diameter of (0,6 ± 0,1 ) mm. The bars are nominally 20 mm long and 2 mm wide with a nominal 2 mm separation. 3.1.1.3 Filter A filter with its maximum transmittance...

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