corneal warpage

corneal warpage 

A relative change in the shape of the corneal surface produced by contact lenses, especially rigid lenses with low or no oxygen transmissibility. It affects vision. It is easily observed with corneal topography. The cornea recovers following cessation of contact lens wear. See videokeratoscope.
References in periodicals archive ?
Prior to pre-operative assessment, soft contact lens wearers need to leave their lenses out for one to two weeks and rigid lens wearers must leave lenses out for at least four weeks due to the possibility of corneal warpage and oedema.
PMMA has almost no oxygen transmission and is quite inflexible and so long term wear usually causes corneal warpage (Figure 4) and problems related to hypoxia and, therefore, these patients should be refitted with RGPs.
a) There is mild keratoconus present b) The subject is not fixating steadily c) There is corneal warpage present d) There is regular astigmatism of over 1.