With this type of contact lenses we can correct myopia (farsightedness) and hyperopia (nearsightedness). But soft contact lenses are not all the same. Types of soft contact lenses are:
1.Normal contact lenses for daily use (lenses that soud be removed at the end of the day and get cleaned for the next use) and
2. Extended wear soft contact lenses (lenses that can be used for more than one day without removing them).
The basic difference between these two categories is their water containment. In the first category we have all the soft contact lenses with water containment up to 38%. In the second category belong the soft contact lenses with water containment 55% - 74%.

The greater water containment of a soft contact lens provides a higher oxygenation (oxygen permeability) and therefore you can use them for a prolonged period of time. But there are some restrictions. Not eeveryone can use soft contact lenses with high water containment. that is because these lenses demand more water for your eyes (tears), than the other category, in order to be confortable and keep their proper form. Otherwise they tend to dry out. On the other hand, there are individual differences on the quantity and the quality of the tear secretion. Therefore only your optometrist can decide (after he has conducted the appropriate tests) if you can use this type of contact lenses.