S had normal visual development until 6 years of age, and thereafter severe acuity reduction due to corneal opacification, but no evidence of visual-field loss.

• 利用功能性核磁共振扫描该病人的大脑，发现他的视皮层中对应外周视野的区域被用来加工视觉信息，而对应中央视野的区域被用来加工触觉信息。