Advantages of progressive lenses
The progressive glasses wearer can adjust the additional lens power required for clear vision at different viewing distances by tilting his or her head to sight through the appropriate part of the vertical progression;
The progressive lens location of the correct addition power for the viewing distance usually only requires small adjustments to head position, since near vision tasks such as reading are usually low in the visual field and distant objects higher in the visual field.
Progressive addition lenses avoid the discontinuities (image-jumps) in the visual field created by progressive lenses and are more cosmetically attractive. Since and related designs are associated with 'old age', proponents have suggested the lack of segments on the lens surface of a progressive lens appears more 'youthful' since progressive lenses associated with younger wearers lenses tend to be free of segments or lines on the surface.
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