ANSI Z80.3 pdf free download

ANSI Z80.3 pdf free download.Nonprescription Sunglass and Fashion Eyewear Requirements.
3 Definitions
3.1 Capable of withstanding an impact test
The ability of a lens to withstand impact as determined by 100% testing or by testing of a statistically significant sample (for example, conforming to the requirements of ANSI/ASQC Z1 .4) of each production batch, or at the option of the manufacturer, as an integral part of the manufacturing process. Capability of withstanding an impact test is determined by testing at any feasible stage of manufacture, as described in 5.1.1 and 5.1.2.
3.2 Reference point
The point on a lens blank, unmounted lens, or finished lens at which refractive properties, and around which transmittance properties, are specified and measured.
3.2.1 Intended visual axis
When specified, the point on a lens coincident with the wearer’s interpupillary distance or other known or presumed line of sight.
3.2.2 Geometric center
When the intended visual axis is not specified, the geometric center shall be the reference point. The geometric center is the point midway between the two vertical tangents and midway between the two horizontal tangents of the edges of a finished lens. For a one-piece or goggle lens intended to cover both eyes, the vertical midline of the lens may be used to determine the geometric center of the portion of the lens for each eye.
3.3 Lens fracture
A lens is considered to have fractured when it cracks through its entire thickness and across a complete diameter into two or more separate pieces, or when any piece of lens material visible to the naked eye becomes detached from the ocular surface, or if the test ball passes through the lens.
3.4 Lens types
3.4.1 General purpose lens
A lens whose nominal luminous transmittance is at least 8% and that allows the apparent chromaticity of Standard Illuminant D65, when viewed through the lens, to fall within the boundary for daylight (4.10.2.1 part 4, and Figure 1).
3.4.2 Gradient tint lens
A lens whose luminous transmittance varies significantly across the lens.
3.4.3 Photosensitive lens
A lens whose luminous transmittance or color, or both, depends on the recent exposure history of the lens.
3.4.4 Polarizing lens
A lens whose luminous transmittance varies with the amount and orientation of the polarization in the incident light.
3.4.5 Special purpose lens
3.4.5.1 Strongly colored lens
A lens that causes the apparent chromaticity of Standard Illuminant D65, when viewed through the lens, to fall outside of the boundary for daylight (4.10.2.1 part 4, and Figure 1).
3.4.5.2 Very dark lens
A lens whose nominal luminous transmittance is between 3% and 8%.
3.4.6 Uniform tint lens
A lens whose luminous transmittance does not vary significantly over the area of the lens.
3.5 Noncorrective impact-resistant lenses
Glass lenses, plastic lenses, or laminated glass lenses made impact resistant by any method. However, all such lenses shall be capable of withstanding the impact test described in 5.1.
3.6 Production batch
An identifiable group of lenses of essentially the same curvature, thickness, and material, manufactured under essentially the same conditions and during a substantially continuous production period.
3.7 Refractive properties
3.7.1 Astigmatic power
A measure of the maximum refractive power difference between any two meridians within a lens.
3.7.2 Prismatic power
Expressed in prism diopters (a), the apparent displacement, in centimeters, of an object located 1 meter from the lens in the meridian of maximum displacement.
3.7.3 Refractive power
Expressed in diopters (D), the reciprocal of the back focal length of a lens measured in meters.ANSI Z80.3  pdf download.