Does a ghost's attack range increase with ocular implants, or just their sight?

Just their sight increases.

Range is already at 14, but obviously they can't shoot that far if they can't see that far.

Also, Kyle is right.

That's why you take a unit go near an enemy and have a ghost there and now you can shoot farther then when the ghost is by himself. (If you don't have ocular implants) If you have ocular implants then there is no difference.