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A patient with adds over 2.00 may complain that some objects appear blurred through both the near and distance portion of their spectacles. They may have difficulty seeing their knitting pattern or cookery book for example. More seriously, they may complain that they are unable to do their job when it involves good vision in that 'intermediate' area.
Some patients won't complain about this missing part of their vision if they have no need to view objects there, or they are currently wearing a progressive lens. Once a patient is aware of this disadvantage to bifocals (or two separate pairs) and they find themselves disadvantaged, it will be time to correct your patient for intermediate vision.
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