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This section specifies the requirements、 measurement methods、 and markings for single beam presbyopia lenses. This section is applicable to over-the-counter single range close up reading packaged glasses. The following normative references are essential for the application of this document. For dated references、 only the dated version applies to this document. For undated reference documents、 the latest version (including all modification orders) applies to this document、 GB 10810.1 Spectacle Lenses Part 1、 Single and multifocal lenses (GB 10810.1-2005、 ISO 8980-1 I 2004、 MOD) GB 10810.3 Glasses and related eyewear products - Part 3: Transmittance specifications and measurement methods (GB 10810.3-2006、 ISO 8980-32003、 MOD) GB/T 14214 General requirements and test methods for spectacle frames (GB/T 14214-2003、 ISO 12870.1997、 MOD) GB/T 26397 Ophthalmic optical terminology (GB/T 26397-2011、 ISO 13666:1998、 MOD) QB/T 2506 Glasses、 German lenses、 optical resin lenses、 and the following terms and definitions defined in GB/T 26397 are applicable to this document. 3.1 Single vision ready to wear near vision spectacles are designed for close range reading only、 with or including a pair of single range lenses with the same spherical top power、 and are not prescribed. 3.2 Optical center horizontal distance; The distance between the optical centers of two OCD lenses in the direction parallel to the geometric centers of the two mirror circles. 3.3 Optical center horizontal deviation The difference between the measured value of the optical center horizontal distance and the nominal value. 3.4 Optical center horizontal deviations of one side The difference between the horizontal distance of one side of the optical center and half of the nominal value. 3.5 Optical center vertical deviation The difference in height between the optical centers of two lenses
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