What factors need to be taken consideration in cases of presbyopia?
• In general terms, from the optical viewpoint the loupe is simply a magnifier incapable of correcting ametropia. This means in the first place that the working spectacles should be provided with a suitable pair of lenses by a reliable optician. It often occurs that the left and right eye have varying degrees of vision, frequently accompanied by astigmatism. None of this can be corrected by a loupe. If a loupe without corrective lenses is used, first of all the optical results are less than optimal, and secondly the user quickly becomes tired since one or both eyes are being expected to work harder than they are able to. • See also Question 2.), or Question 4.b).
