Clalen iris Bi-weekly products have lower water content than Clalen iris Daily products. Contact lenses with low water content may not feel good for the first time, but as time goes by, eye moisture is not taken away and can be used for a little longer. Daily contact lenses, on the other hand, contain a lot of moisture and are good for first-time use in moist conditions. However, the moisture in the eyes decreases as time goes by because it takes away more water from the eyes.