ANSI Z80.3-2015 pdf free download

ANSI Z80.3-2015 pdf free download.Ophthalmics – 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.
3.4.5 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 (Δ), 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. 3.8 Transmittance properties Computational data for transmittance properties are given in Table 1, with the appropriate reference data given in Table 2. 3.8.1 Luminous transmittance A function of the spectral transmittance of the lens weighted by the corresponding ordinates of the photopic luminous efficiency distribution of the CIE (1931) standard colorimetric observer and by the spectral intensity of Standard Illuminant C.
5.9 Resistance to radiation test Use a high pressure xenon arc lamp of nominal 450 W electrical power, having an ozone-free fused silica envelope. Burn in a new lamp for at least 150 h; discontinue use after 2000 h of operation. Mount the lamp with its axis vertical. Operate it with the lamp current equal to 25 A ± 0.2 A. Mount the lens under test on the horizontal axis of the arc, at a distance of 300 mm ± 10 mm from the center of the arc, with the surface of the lens essentially perpendicular to the axis of the radiant beam from the arc. Place a polished clear white crown glass filter between the arc and the lens (e.g., Schott B270, 4 mm thick, or equivalent); the wavelength at which the transmittance of this filter is 46% should be 320 nm ± 5 nm. Expose the lens for 50 h ± 0.2 h. The relative change of luminous transmittance shall not exceed: 1) 5% for Cosmetic lens category; 2) 8% for General Purpose category; or 3) 10% for Special Purpose category.