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A natural change which comes with ageing is the fact that sight worsens successively.
This is called sight ageing degradation or presbyopia. Today there are three ways of re-configuring sight ageing with the help of contact lenses: multi-focal lenses, progressive lenses or with a technique called mono-vision.
Technical development and research has discovered that which we today call progressive lenses.
With progressive lenses, distance sight capacity is located in the upper half of the lenses while near sightedness are conducted by the lower halves. In the overlap of the upper and lower portions of the lenses, the user gets a clear picture of the area which is neither further away, or indeed particularly nearer.
Another advantage is that these types of lenses do not contain any lines across the line of sight which is the case when using multi-focal lenses.