Long W F, Haywood K M
School of Optometry, University of Missouri, St. Louis 63121.
J Am Optom Assoc. 1990 Oct;61(10):777-81.
Technical advancements in target archery have been extended to widespread use of "scopes" which magnify the target. In fact, these optical devices are simple converging lenses used at an arm's length from the eye. They produce a magnified image, but it is an image that suffers from significant dioptric blur, diminished somewhat by use of a peep sight in the bowstring which functions as an aperture stop. Visual acuities were taken with these scopes and, as might be expected, it was found that subjects saw no better with them. With the highest power scopes, acuity actually decreased. Experienced archers did slightly better with these aids than those with no archery experience.
射箭技术的进步已扩展到“瞄准镜”的广泛使用，瞄准镜可放大目标。实际上，这些光学装置是简单的凸透镜，使用时与眼睛保持一臂的距离。它们能产生放大的图像，但该图像存在明显的屈光模糊，通过在弓弦上使用作为孔径光阑的窥孔瞄准器，这种模糊会有所减轻。使用这些瞄准镜测量了视力，不出所料，发现受试者使用它们时视力并没有更好。使用最高倍率的瞄准镜时，视力实际上还下降了。有经验的弓箭手使用这些辅助工具的表现比没有射箭经验的人略好。
