1.1 本试验方法涵盖了由透明部件（如飞机挡风玻璃、雨棚、HUD组合眼镜、护目镜或护目镜）引起的双眼视差量。该测试方法可单独或组合应用于任何尺寸、形状或厚度的零件，以确定每个透明零件对操作员使用的整个“观察系统”中存在的整体双眼视差的贡献。 1.2 该测试方法代表了可用于测量双眼视差的几种技术之一，但却是唯一一种产生与操作员视觉性能相关的定量优值的技术。 1.3 本试验方法采用了目前正在根据试验方法测量光学角偏差的仪器 F801 . 1.4 以英寸（英制单位）表示的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 当存在足够的双眼视差，从而超过帕努姆区域（单视觉区域）的界限时，就会发生复视或视力加倍。每当一个物体比另一个物体明显更近（或更远）时，就会出现这种情况，因此观察其中一个物体会导致另一个的图像加倍。 这一点很容易证明:闭上一只眼睛，看着远处墙上的时钟（或其他物体）。现在将拇指放在时钟图像的一侧。现在睁开双眼。如果你看时钟，你会看到两只大拇指。如果你看看你的拇指，你会看到两个钟。 5.2 驾驶装有宽视场平视显示器（HUD）（如LANTIRN HUD）的飞机的飞行员的投诉表明，他们在使用HUD时感到不适（眼睛疲劳、头痛等），或看到两个目标或两个指针（HUD上的瞄准符号）。随后的调查显示，问题的产生是因为飞机的透明度和HUD显著改变了目标和HUD图像的光学距离，从而导致双眼视差超过帕努姆的面积。该测试方法的使用提供了一种程序，通过该程序可以容易且精确地测量由于在其视场中存在透明部分而导致的人类操作者所经历的双眼视差的量。

1.1 This test method covers the amount of binocular disparity that is induced by transparent parts such as aircraft windscreens, canopies, HUD combining glasses, visors, or goggles. This test method may be applied to parts of any size, shape, or thickness, individually or in combination, so as to determine the contribution of each transparent part to the overall binocular disparity present in the total “viewing system” being used by a human operator. 1.2 This test method represents one of several techniques that are available for measuring binocular disparity, but is the only technique that yields a quantitative figure of merit that can be related to operator visual performance. 1.3 This test method employs apparatus currently being used in the measurement of optical angular deviation under Test Method F801 . 1.4 The values stated in inches (Imperial units) are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Diplopia or doubling of vision occurs when there is sufficient binocular disparity present so that the bounds of Panum's area (the area of single vision) is exceeded. This condition arises whenever one object is significantly closer (or farther) than another so that looking at one will cause the image of the other to appear double. This can be easily demonstrated: Close one eye and look at a clock (or other object) on a distant wall. Now place your thumb to one side of the image of the clock. Now open both eyes. If you look at the clock, you should see two thumbs. If you look at your thumb, you should see two clocks. 5.2 Complaints from pilots flying aircraft equipped with wide field of view head up displays (HUDs), such as the LANTIRN HUD, indicated that they were experiencing discomfort (eye fatigue, headaches, and so forth) or seeing either two targets or two pippers (aiming symbols on the HUD) when using the HUD. Subsequent investigations revealed that the problem arose from the fact that the aircraft transparency and the HUD significantly changed the optical distances of the target and the HUD imagery so that binocular disparity, which exceeded Panum's area was induced. Use of this test method provides a procedure by which the amount of binocular disparity being experienced by a human operator due to the presence of a transparent part in their field of view may be easily and precisely measured.