ANSI Z80.31-2012 pdf download Ophthalmic Optics – Specifications for Single-Vision Ready-to-Wear Near-Vision Spectacles
1 Scope
This Standard specifies the minimum requirements for complete single-vision ready-to-wear near- vision spectacles with positive power, without regard to luminous transmittance, available directly to the public without the prescription of a licensed professional.
1.1 Purpose The purpose of this standard is to establish requirements for ready-to-wear near-vision spectacles, commonly called “readers”. They are not designed to be industrial safety eyewear as defined in ANSI Z87.1 -201 0, sports eyewear as defined in ASTM F803, nor prescription eyewear as defined in ANSI Z80.1 -201 0.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this American National Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
ANSI Z80.1 -201 0, Recommendations for prescription ophthalmic lenses 1
ANSI Z80.1 7-2008, Focimeters 1
ANSI Z80.5-201 0, Requirements for ophthalmic frames 1
ANSI Z87.1 -201 0, Practice for occupational and educational eye and face protection 1
ASTM D41 2-2002, Test methods for rubber properties in tension 2
ASTM F803-2003, Eye protectors for use by players of selected sports 2
ASTM D2240-2003, Standard test method for rubber property – Durameter hardness 2
Title 21 , Code of Federal Regulations, Section 801 .41 0 3
Title 1 9, United States Code, Section 1 304 3
Title 1 9, Code of Federal Regulations, Section 1 34
3 Definitions
3.1 Design reference points: The points at which all optical measurements are made.
3.1.1 Horizontal: The design reference points are specified by the manufacturer and are spaced symmetrically with respect to the vertical symmetry axis of the frame in accordance with ANSI Z80.5, box measuring diagram. If the manufacturer does not designate a horizontal design reference point, the horizontal design reference point is at ½ the A-distance.
3.1.2 Vertical: The design reference points are specified by the manufacturer and are spaced symmetrically with respect to the horizontal symmetry axis of the frame in accordance with ANSI Z80.5, box measuring diagram. If the manufacturer does not designate a vertical design reference point, the vertical design reference point is at ½ the B-distance.