Therefore , it might be said that our position as to the etiology of primary glaucoma ,as Iconceive it , is that at leas因此,可以这样说:关于原发性青光眼的病因,据我看来,至少有四个因素:其中有两个因素是有问题的和多半是假设的,但另两个因素是肯定的。