A pair of relaxed eyes of a patient have a refractive power of 48.5 diopters. a) is this person near or far sighted? I think its far sighted because of the short focal length. b) Find the near point of this person. (The retina is 2.4cm from the lens). Ok, so the f=.02 and I'm assuming we supposed to use 1/do + 1/di = 1/f. I'm just not sure what I'm supposed to find. Which variable represents the length of the retina to the lens? Which one am I finding?