acuity
visual acuity
sharp-sightedness

And players of some video games develop better visual acuity.

Visual acuity can be reduced to less than 20/200 in both eyes.

A visual acuity test checks for how well you can see.

Can anyone explain to me why this suggests they had better visual acuity?

Her field of visual acuity narrowed as she looked this man over.

We would like to know how much average visual acuity has increased or decreased in the population.

Special techniques are needed to measure visual acuity in a child who is too young to speak.

Arts programs help them develop this visual acuity and intelligence.

They almost certainly didn't have better visual acuity than a human, for that you'd need compound eyes each the size of your head.

The article was based on a study they had done that showed playing action video games improved visual acuity.