-At the bottom (in the direction of your keyboard): a strong correction
-In the middle (in the direction of your screen): a fixed average
-At the top (in the direction of your surroundings up to 2 m: low correction.
They are perfectly adapted to the computer and also ideal for any Office work and in General for all manual or sedentary activities (piano, kitchen, ..). With these glasses of proximity, less fatigue of the eyes under all circumstances.
These lenses are particularly suitable for people who poorly supporting the progressive lenses.
** Example of gradual decrease power glasses + 2.50: power at the bottom of the glass: + 2.50. Power at the top of the glass: + 0.50. Either a gradual decrease in DC, 2.00.
There are also glasses which can be hanged at the neck with click inbetween the lens, glasses to make-up by moving the lens from left to right. The ultra thin near glasses which can be kept in the pocket.
They are products of French see at
http://www.lunettes-presbyte.fr/lunettes-de-maquillage,fr,2,21.cfm
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