It is fairly easy to tell; you will have to start squinting at things to see better or being up close to the object. Things will appear slightly fuzzy and you can't see sharply and detail will blur.
Most people notice frequent headaches or eye straight and may find themselves squinting or feeling fatigued while driving or playing sports. If you are experiencing these symptoms it's best to have...
I'll take a stab at it: This seems to mean that it is a high order of knowledge to have a sense of the limits of one's knowledge. Being 'smart' and 'informed' or 'savvy' is great, but being aware of...
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