One unfortunate side effect of wearing scleral contact lenses that are larger than 18mm is the accumulation of debris underneath the lens after 4-5 hours of wear that causes a patient’s vision to become cloudy.  This does not affect everyone, but according to a study done by Visser, et al. about 50%of patients will have to remove their len(s) midday in order rinse and refill them.  The picture on the left is a cross-section of the liquid reservoir on a patient’s eye that has a significant build up of debris.  The picture on the right shows the lens after being rinsed and reapplied with fresh solution.  For most patients that have this problem this is a insignificant issue that they easily deal with in order to gain all the benefits that scleral lenses provide.  Using a more viscous artificial tear drop to fill the lenses before insertion may slow this process down.