All 3 Uses

focus
in
The Notebook
(Edited)

He was two years older than she was, and as she drove along this roadway-in-time, he slowly came into focus once again.
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focus = view (a state where something can be seen clearly)
When he looked at it, and he often did late in the evening, he could see desire in the colors and the lines, and if he focused carefully, he could imagine what she had been thinking with every stroke.
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focused = concentrated
In the painting she liked the best, she noted the artist had purposely exaggerated the scene with smaller-than-life figures, wide lines, and heavy sweeps of color, as if not completely focused.

focused = (of a lens) adjusted to provide a clear image

Definitions:

(1) (focus as in: Turn your focus to question #2.)
to direct attention or effort toward a single thing; or the ability to do so without getting distracted
(2) (focus as in: The focus of our study is...)
where attention is concentrated or directed
(3) (focus as in: bring into focus; or out of focus)
a state where something has come into view or can be seen clearly; or an adjustment made to permit a clear view
(4) (focus as with technical usage)
technical usage typically involves some sense of center or concentration such as:
- physics — a point where things come together such as the point where light rays meet
- geometry — a fixed reference point (as of a parabola)
- geology — the point of origin of an earthquake
See a comprehensive dictionary for other less common meanings.
(5) (meaning too rare to warrant focus)