A yoga friend of mine told me that her husband had had a mild stroke, the only affect of significance being a sudden inability to read. He can see letters and understands the concepts, but simply cannot make it work. He's currently undergoing some form of speech therapy to cause neuroplasticity to help his brain adopt alternative approaches. Many years ago, as a young teen, I collided with another baseball player, and we hit heads. I ended up with a large bump and nagging headache. That evening I looked at the evening newspaper (we had those back then, look it up younguns) and saw nothing but letters and shapes. I knew words were there, but I couldn't find them. Dad took me to the ER, where I was diagnosed with a minor concussion, sent home and told to take aspirin.
After a couple days my symptoms disappeared, but I've always remembered that uncanny sensation.
Reminds me that the ability to read is an amazing everyday miracle.