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The effect of peripheral curve modifications on the forces which hold the contact lens on the eye using gas permeable contact lenses

1 May 1984


The experiment consisted of removing a contact lens from the subject's cornea following modification of the contact lens. Modification consisted of flattening the peripheral curve. The question that we hoped to answer was whether or not the amount of force required to remove the contact lens would increase as the peripheral curve was modified. Our contention was that while flattening the peripheral curve effectively "loosens" the lens the amount of force required to remove the lens from the contact will increase. The experiment showed that in 2 out of 3 subjects there was an increase in the adhesive forces acting on the lens between monocurve and the first peripheral curve. Subsequent flattening of the peripheral curve resulted in a gradual decrease in adhesion force with each modification to flatten the peripheral curve. We would expect such a result since a monocurve has less surf ace area contact between l ens and cornea than a bicurve. However, the data do not support the thought that the adhesion force will increase with each successive flattening of the peripheral curve.


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