Revista Brasileira de Oftalmologia
Print version ISSN 0034-7280
BROCCHETTO, Daniela Coneglian; DANTAS, Brunno and SCHOR, Paulo. New concepts in corneal reshaping. Rev. bras.oftalmol. [online]. 2010, vol.69, n.2, pp. 132-137. ISSN 0034-7280. http://dx.doi.org/10.1590/S0034-72802010000200013.
The cornea has a great influence in the visual process. However, it is liable to distortion, such as flattening. When this flattening is caused by the use of contact lenses, we call "corneal warpage". In this case, some symptoms may occur as blurred vision with glasses, conjunctival hyperemia, foreign body sensation, etc… Used to think that the cornea was more rigid and, in time, realized that the cornea has viscoelastic properties. We can say that the cornea has a body biomechanics property and suffers instability when there are some changes, such as keratoconus, which is a progressive corneal degeneration. In order to preserve the cornea more stable, the cross-linking technique was developed to promote covalent bonds between the lamellae of the cornea to make it stronger and less elastic. Other corneal change that may occur is based on the induction in corneal reshaping by using rigid contact lenses (only during sleeping) with high oxygen transmissibility (DK / L). This technique is known as Orthokeratology and its concepts will be addressed in this study.
Keywords : Orthokeratologic procedures; Orthokeratology; Collagen; Corneal topography; Cornea [physiopathology]; Cornea [injuries]; keratoconus; Contact lenses; Riboflavin [therapeutic use]; Ultraviolet therapy.