Most of the nutrients and essential ions supplied to the cornea are supplied by the tears because they are not supplied through the circulatory system directly. In the case of a scleral lens the reservoir under the lens does not allow for tear exchange (the process of liquid under the lenses being replaced by new tears) as often as it does in other contact lenses. In soft lenses it is measured at approximately 30 minutes. In the case of a scleral lens the exchange rate is often measured in hours. This raises the question what should be done to provide the best environment for scleral lenses.
Nutrifill was designed to provide a solution to go under the lens and provide the essential ions supplied to the cornea by our natural tears. We believe that including the essential ions of sodium, potassium, calcium, and magnesium buffered with phosphate in the scleral lens insertion solution offers patients the benefit of a more natural tear-like solution compared to the current use of sodium chloride solutions alone, especially when you consider that the tear exchange with a scleral lens is often several hours, if not all day.
-Ralph P. Stone, PhD Inventor, US Patent# 9,259,437