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The deterioration shall be checked by means of one or more samples of glass placed as a reference near the lenses to be tested. The mixture shall be sprayed until the variation in the diffusion of light on the sample or samples measured by the method described in Appendix 2, is such that: Dd = (T5-T4)/ T2 = 0.0250 ± 0.0025. |
a0c0 |