초록 ▼

A technique for automated design of a corneal surgical procedure includes topographical measurements of a patient's eye to obtain corneal surface topography. Conventional techniques are used to obtain the thickness of the cornea and the intraocular pressure. The topographical information is interpol

A technique for automated design of a corneal surgical procedure includes topographical measurements of a patient's eye to obtain corneal surface topography. Conventional techniques are used to obtain the thickness of the cornea and the intraocular pressure. The topographical information is interpolated and extrapolated to fit the nodes of a finite element analysis model of the eye, which is then analyzed to predict the initial state of stress of the eye and obtain pre-operative curvatures of the cornea. Incision data constituting the "initial" surgical plan is incorporated into the finite element analysis model. A new analysis then is performed to simulate resulting deformations, stresses, and curvatures of the eye. They are compared to the original values thereof and to the vision objective. If necessary, the surgical plan is modified, and the resulting new incision data is entered into the model and the analysis is repeated. This procedure is repeated until the vision objectives are met.

대표청구항 ▼

[ What is claimed is:] [1.] A computer-implemented method of simulating patient specific corneal deformation in response to a corneal incision, comprising the steps of:(a) measuring the topography of a portion of the patient's eye using a topography measuring device to produce patient specific x,y,z

[ What is claimed is:] [1.] A computer-implemented method of simulating patient specific corneal deformation in response to a corneal incision, comprising the steps of:(a) measuring the topography of a portion of the patient's eye using a topography measuring device to produce patient specific x,y,z coordinates for a number of patient specific data points of the surface of the patient's eye;(b) storing in a storage means a mathematical analysis model of the patient's eye, the model including a number of nodes, the connectivities of which define a plurality of elements;(c) determining a value representing intraocular pressure in the patient's eye and assigning that value to each element;(d) representing an incision in the mathematical analysis model by assigning at least one of a thickness and a value of the modulus of elasticity to elements surrounding the incision computed from the value determined in step (c); and(e) using the mathematical analysis model to compute new values of the patient specific x,y,z coordinates resulting from the incision at each of the nodes, respectively.