Neurally, this is true; they possess the same amount of gray matter dedicated to processing sensory input but it has fewer signals to work with. We who possess all five senses can do something similar by using sensory-deprivation tools to note the “sharpening” of a particular sense we pay attention to.
In terms of apparatus, however, simply being deaf doesn’t suddenly eliminate near-sightedness.
They also tend to have better vision than hearing people, I believe.
Neurally, this is true; they possess the same amount of gray matter dedicated to processing sensory input but it has fewer signals to work with. We who possess all five senses can do something similar by using sensory-deprivation tools to note the “sharpening” of a particular sense we pay attention to.
In terms of apparatus, however, simply being deaf doesn’t suddenly eliminate near-sightedness.