Smiling Petra in Preciosa Erect glasses, made half a
century ago. Contact lenses had not yet arrived
in the Amsterdam shops and as a result, glasses
with unusual prescriptions could be seen in the
streets. Nowadays, opticians regard three diopters
as the maximum difference between left and right
that can be used in glasses. The lady who bought
these Preciosa glasses had to cope with a difference
of no less than eight diopters
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