Farsighted people see far more easily than they see near. Some farsighted patients can give extra effort and use their eyes' focusing muscles to force the eyes to see near things too. This fact makes understanding farsightedness less straightforward than understanding nearsightedness. The simplest explanation is that farsighted patients have eyes that aren't quite strong enough. If the amount of farsightedness is small enough, and if the patient has enough range of muscle power to focus the lens inside the eyes, then that patient may be able to give extra effort and focus their own eyes to see both near and far objects clearly. As with any other muscle system, this can make the eyes achy and tired from all the extra effort. If the amount of focus effort required is too great, or if the patient doesn't have enough range of muscle focus available, then that patient will experience blurry vision too. Usually this blurry vision is worse for near tasks in farsighted patients.
Since farsighted patients have eyes that aren't quite strong enough, the Optometrist will prescribe "plus" lenses to add power. Then when the patient looks through their lenses, their eyes can be relaxed and at the same time they can see near objects clearly. Some farsighted patients prefer to take their eyeglasses off for distance tasks and others prefer to leave their eyeglasses on for convenience when doing far and near tasks at the same time.
The medical name for farsightedness is "hyperopia".