Dr John Hagan, ophthalmologist in Kansas City, Missouri, and a fellow with the American Academy of Ophthalmology, said some people who do not have normal depth perception cannot see in 3D at all.

• 密苏里州Kansas成的眼科专家，亦是美国眼科学会成员的JohnHagan医生说，一些无正常深度感知的人是无法观看3D图像的。