You'll change your mind about not bothering with safety glasses once you've injured your eyeball. That's called closing the barn door after the horse gets out.
An instance of eyeballing something.
Give this report an eyeball, will you please?
(informal) Surveillance.
(marketing, in the plural) A readership or viewership.
We need compelling content for the new Web site so we can attract more eyeballs.
(CB radio, slang) A face-to-face meeting.
We had an eyeball last year.
(Caribbean) A favourite or pet; the apple of someone's eye.
verb
(transitive, informal) To gauge, estimate or judge by eye, rather than measuring precisely; to look or glance at.
A good cook can often just eyeball the correct quantities of ingredients.
Each geometric construction must be exact; eyeballing it and getting close does not count.