Fig. 6.1 Loading condition for tonometry Several years ago, the tonometry has been reviewed due to some difficulties detected on its fundamentals: design of the equipment, theory behind its development,…
Fig. 3.1 The dioptric plot is color-coded so that steep and flat areas on the cornea can be easily visualized. An eye with irregular astigmatism is shown The corneal structural…
Fig. 4.1 Individual lamella showing orientation of the collagen fibrils We then postulate that a strain energy density W for an individual lamella takes the form [4] where C is…
Fig. 5.1 First patient operated with the Ferrara ring (postkeratoplasty high astigmatism) The excellent tolerance to the implant by the transplanted cornea gave us the necessary confidence to apply the…
Fig. 2.1 Mean corneal radii of curvature and thicknesses At the apex, a wide range of variation of the radius of curvature of 7–8.5 mm is compatible with good visual function,…
Fig. 1.1 A diagram of a radial keratotomy with four incisions and the effect of the intraocular pressure. The cornea bends in the incised area and flattens in the not-incised…
