Having a maximal visual acuity of the better eye, after correction by refractive lenses, of one-tenth normal vision or less(20/200 or less on the Snellen test).

• 瞎的，失明的通过折射矫正后，最好眼最大视力敏感度为正常视力的1/10或少于1/10的（斯奈伦测试20/200）或更低