ANSI Z80.1-2015 pdf free download

ANSI Z80.1-2015 pdf free download.Ophthalmics – Prescription Ophthalmic Lenses – Recommendations.
1 Scope and Purpose 1.1 Scope This standard applies to all prescription dress ophthalmic spectacle lenses in edged or assembled form. It is a guideline for entities that fabricate, assemble or process dress eyewear or lens components. Relevant optical and physical specifications and tolerances of this standard also apply to uncut lenses. This standard does not apply to products covered by • ANSI Z80.3, American National Standard for Ophthalmics – Nonprescription sunglass and fashion eyewear requirements • ANSI Z80.31 , American National Standard for Ophthalmics – Specifications for single vision ready to wear near vision spectacles • ANSI Z87.1 , American National Standard for Occupational and educational personal eye and face protection devices • ASTM F803, Eye protectors for selected sports 1.2 Purpose This standard reflects the shift in utilization from mass-produced lenses to a basic dependence upon custom-processed lenses. It provides minimum acceptable tolerances for new lenses prepared to an individual prescription. The power, prism, and axis tolerances established in this standard are subject to measurement limitations associated with the accuracy and repeatability of the current state-of- the-art focimetry and other measurements commonly in use by laboratory technicians and eyecare professionals. Users should therefore take into account the measurement capability of the devices (and methodology) when applying tolerances to the spectacle lens. As such, this voluntary standard expresses technical concepts that provide a frame of reference for safety and effectiveness.
2 Normative References The following standards contain provisions that, through reference in this text, constitute provisions of this American National Standard. All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to apply the most recent editions of the standards indicated below. ANSI Z80.3, Nonprescription sunglass and fashion eyewear requirements 1 ANSI Z80.1 7, Focimeters 1 ANSI Z87.1 , Occupational and educational eye and face protection devices 1 ASTM F803, Eye protectors for selected sports 2 ASTM D21 03, Specifications for polyethylene film and sheeting 2 Code of Federal Regulations, Title 1 6 Part 456 3 Code of Federal Regulations, Title 21 Part 886.5844 3 Code of Federal Regulations, Title 21 Part 801 .41 0 3 ISO 8980-1 , Ophthalmic optics – Finished single vision corrective lenses – Part 1: General requirements 1 ISO 8980-2, Ophthalmic optics – Uncut finished spectacle lenses – Part 2: Specifications for progressive power lenses 1 ISO 8980-3, Ophthalmic optics – Uncut finished spectacle lenses – Part 3: Transmittance specifications and test methods 1 ISO 8980-4, Ophthalmic optics – Uncut finished spectacle lenses – Part 4: Specifications for anti- reflective coatings 1 ISO 8980-5, Ophthalmic optics – Uncut finished spectacle lenses – Part 5: Minimum requirements for spectacle lens surfaces claimed to be abrasion resistant 1 ISO 1 3666, Ophthalmic optics – Spectacle lenses – Vocabulary
3 Definitions 3.1 Aberration The failure of a refracting surface or lens to bring all rays from an object point toward a desired image point. This can result in image blur. Aberration also results in curvature in the image of a straight line (see 3.1 1 ). Aberration may be inherent in the design of a lens or may result from errors in processing (see 3.29 and 3.30) and/or positioning (see 3.21 .1 ). 3.2 Addition The difference in vertex power, normally referred to the surface containing the add, between the reading or intermediate portion of a multifocal lens and its distance portion. An addition (or add) is commonly equivalent to a positive spherical lens superimposed on a distance prescription to permit the wearer to focus more easily upon near objects. 3.3 Axis 3.3.1 Cylinder Axis The direction of the principal meridian which contains the spherical power component of a sphero-cylinder lens (see 3.1 6.22). 3.3.2 Optical Axis A straight line perpendicular to both faces of a lens. A ray will pass through a lens along such a line without deviation. It represents the part of the lens at which the prism power is zero. In most lenses, there is only one line normal to both faces. In a plus spherical lens, the optical axis penetrates the thickest part and in a minus spherical lens at the thinnest part. If the lens has prism power, the optical axis may lie outside the lens. If the two surfaces are concentric in a given meridian, any line in such a meridian that is normal to both surfaces may be selected to represent an optical axis. If the surfaces are concentric in all meridians, then any line may be selected to represent the optical axis.