Doreen checking the 1.50 reading add in lined bifocals made by Pearle in the 1980's. The demarcation line of the reading segment in the lenses is invisible. This has nothing to do with my editing - simply an example of the discrete combination of fairly strong minus lenses with a modest reading add. No doubt, the first owner of the glasses must have felt relief when she noticed that the reading segment was almost invisible.
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