"It's not good," Andy said in a video posted to Aspinall's YouTube channel. "His right eye, he can't see anything. It's just gray. [Doctors] tested him on words, and he just couldn't see anything. His left eye is 50%. It went about four letters [down the chart] and then he couldn't see letters. So, one is really, really blurry -- and one is not working."
There are many sources of vision loss, of course, but it tends to be a lot more common in folks who have metabolic risk factors such as high blood pressure, such as poorly controlled diabetes, such as high cholesterol, which is the other risk factor [identified in the report],