A smiling man with gray hair and glasses, dressed in black, is sitting in a chair with a music stand in front of him.
This man has an eyesight deficiency.
The man may not be having an eyesight deficiency
Gray hair and glasses does not necessarily mean one has an eyesight deficiency.
The man may not have an eyesight deficiency if he is wearing glasses even though he does not need them because he wants to attain a certain image or if the glasses are not prescripition as in some sunglasses.