Flexure effects of double-thin zone toric soft contact lenses.
We use a new model for describing the flexure of hydrogel lenses in situ to evaluate toric hydrogel lenses. The mathematical development of the model precludes use of prism ballasted lenses (because of differential thickness in the vertical meridian and possible lenticulation in the midperiphery), and so double-thin zone lenses were used here. Our results suggest that such lenses (low-minus power) align almost perfectly with the anterior corneal surface creating minimal tear layers.
D003263:Contact Lenses, Hydrophilic; D006801:Humans; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D008433:Mathematics; D008954:Models, Biological; D055095:Optics and Photonics; D011092:Polyethylene Glycols; D012029:Refraction, Ocular; D012044:Regression Analysis
D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D011092:Polyethylene Glycols