鸟类有良好的视力,但它如何调整从看远处到看近处的焦距,却是大家讨论的中心议题.鸟象其他动物一样,能改变晶体的形状来增强视力.但科学家相信,鸟类与众不同的是它的角膜能变形. 科内尔大学的两位动物学家对鸽和鸡进行了精密的试验.他们用视网膜镜监测鸟的总视力,同时用角 Birds have good eyesight, but how to adjust the distance from the distance to see the near focus, but it is the central topic of discussion, birds, like other animals, can change the shape of the crystal to enhance vision, but scientists believe that birds The difference is that the cornea is deformed, and the two zoologists at Cornell University carried out a rigorous test of the pigeons and chickens.They used retinoscopy to monitor the bird’s total visual acuity,