title: Application of hydrogel lens average thickness.
abstract: The equation for the average thickness of a hydrogel lens is a complex function. This report gives a simple method of estimating this parameter. By structuring the information into nomograms, an accurate system is derived which facilitates the design of a contact lens to provide a required average oxygen transmissibility. Several examples of the accuracy of the estimated value compared to the calculated value are shown. Details of the use of these nomograms are given with a discussion on the worth of an average thickness value as compared to a local thickness value.
mesh_terms: D003263:Contact Lenses, Hydrophilic / Q000592:standards*; D004867:Equipment Design / Q000592:standards; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D008962:Models, Theoretical; D010100:Oxygen; D010539:Permeability; D011092:Polyethylene Glycols
chemical_list: D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D011092:Polyethylene Glycols; D010100:Oxygen