鱼类的视觉能力是我们钓鱼人一直研究的课题。我们知道:鱼的视力范围,无论从距离上还是从宽度上,都无法同陆地动物相比。从进化的角度上看,陆地生物与水中生物在视觉系统的构造上完全不同。以我们人类为例:人眼的晶状体是透镜状,具弹性和曲度收缩调节功能。我们想看清楚物体的形状,是靠睫状肌调节晶状体的曲度,让影像恰好定位于视网膜上来完成的。鱼的眼球是圆形的,缺乏弹性、表面曲度不能调节,是靠链突肌前后拉动晶 Fish’s visual ability is a topic that our fishermen have been studying. We know that fish’s range of eyesight can not be compared with land animals, both in distance and in width. From an evolutionary point of view, terrestrial organisms and aquatic organisms are completely different in the construction of the visual system. In our human case, for example: the lens of the human eye is lenticular, with elastic and curvature contraction regulation. We want to see the shape of the object, the ciliary muscle by adjusting the curvature of the lens, so that the image is exactly located on the retina to complete. Fish’s eye is circular, the lack of flexibility, the curvature of the surface can not be adjusted by the chain of muscles before and after pulling the crystal