The T-45 ANSI/ISEA Z87.1-2020 Test Resolution Standard consist of 24 Sunburst Lines, 0.25mm x 30mm, with a center crosshair target area and three off-center vertical and horizontal Ronchi gratings. These features consist of 0.68cy/mm, 0.8cy/mm and 1.6cy/mm bars (which are then 17cy/mm, 20cy/mm and 40cy/mm after 25 X reduction).
The method of using the T-45 Test Resolution Standard consist of a calibrated 8 power telescope, preferably with a reticle, having a minimum aperture of 19mm for plano-spherical lenses and a minimum aperture of 7mm for plano-toric or plano-aspheric lenses, a method for holding the protector in the test position and the T-45 Test Resolution Standard test pattern. The test pattern should be mounted 10.67m from the objective lens of the telescope and have sufficient lighting to conduct the test.
For further detailed information on the Procedure, Apparatus requirements, and Testing for Refractive Power, Astigmatism and Resolving Power refer to the American National Standard for Occupational and Educational Personal Eye and Face Protection Devices Standard ANSI / ISEA Z87.1-2020.
4.0 in. x 4.0 in. – 101.4mm x 101.4mm