![]() These contact lenses provide a regular refractive surface moreover, with the tear layer between the posterior lens surface and anterior corneal surface, they can mask corneal surface irregularities Ĭorneal RGP lenses may be a successful option in the management of mainly mild-to-moderate keratoconus cases. Consequently, when a high number of HOAs appear in keratoconus patients, rigid gas-permeable (RGP corneal, corneo-scleral and scleral) contact lenses are suggested as the best solution for management. Traditional sphero-cylindrical spectacles do not compensate HOAs. Then ocular symptoms, such as halos, glare, starburst and ghost images, along with decreased contrast sensitivity occur depending on the severity of the disease Keratoconus causes a significant coma aberration, because the cone is usually displaced from the centre of the cornea which is the most important refractive element of the eye, ,, ]. The main adverse optical effects induced by keratoconus are the presence of irregular astigmatism and the increase in high order aberrations (HOAs), which can have a devastating effect on the quality of vision, , ]. Keratoconus is typically a progressive, bilateral (usually asymmetrical) corneal disorder characterised by corneal paracentral steepening with apical thinning at the same place.
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