Visual Acuity - The ability to tell apart points which is close together
This is a bit like the resolution of something, you talk about the resolution of an image or microscope. As far as a microscope, the resolution is the smallest distance at which two objects can be told apart.
In your eyes, Rod cells give low visual acuity because many rods join to the same neurone which means light from two objects close together can't be told apart. In you eye, Rod cells are more sensitive, but cone cells (the other type of cells in your eyes) help you see more detail.
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