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Article: RGP surfaces are more prone to drying and creating dry eye symptoms
http://www.eyecaresource.com/conditi...ct-lenses.html
Rigid Gas Permeable Lenses and Dry Eyes
Rigid Gas Permeable Lenses are manufactured from polymeric materials that do not contain any water all. One would think that this is preferred to having the possibility of water evaporating from the lens and causing dry eye symptoms. However, the very nature of the Rigid Gas Permeable Contact Lens polymer is that is “hydrophobic” and tends to repel water and thus the tear film. Rigid Gas Permeable Contact Lenses must be specially formulated to enhance their wetting characteristics so that they are compatible with the tear film. Even with these formulations, their surfaces are more prone to drying and creating dry eye symptoms. The problem of mechanically chaffing the fine structures that attract the tear film and make it stable is even greater with Rigid Gas Permeable Lenses because of the stiffness of the lens…it is rigid
Rigid Gas Permeable Lenses are manufactured from polymeric materials that do not contain any water all. One would think that this is preferred to having the possibility of water evaporating from the lens and causing dry eye symptoms. However, the very nature of the Rigid Gas Permeable Contact Lens polymer is that is “hydrophobic” and tends to repel water and thus the tear film. Rigid Gas Permeable Contact Lenses must be specially formulated to enhance their wetting characteristics so that they are compatible with the tear film. Even with these formulations, their surfaces are more prone to drying and creating dry eye symptoms. The problem of mechanically chaffing the fine structures that attract the tear film and make it stable is even greater with Rigid Gas Permeable Lenses because of the stiffness of the lens…it is rigid