题目选项分析

In persons with astigmatism, the clear outer layer of the eye is deformed in a way that impairs and sometimes distorts vision. The elongated figures in the paintings of El Greco (1541-1614) were so unusual that some critics sought to explain them by hypothesizing that without knowing it, El Greco had an astigmatism that caused everything to appear to him in the distorted way that was characteristic of his painted figures. The proposed explanation is most vulnerable to the criticism that it fails to

【选项】establish that during the period in which El Greco lived, there was any correction available to those who did realize their vision was distorted