As the other comment mentions, it might be due to brick size, but also note that many people considered blind still have some non-zero vision (just e.g. extreme

As the other comment mentions, it might be due to brick size, but also note that many people considered blind still have some non-zero vision (just e.g. extremely blurry, or a tiny field of view etc.). Although this guy had a glaucoma at the age of six, so there would be extremely little left by now.