Abstract: Systems and methods for treating presbyopia are provided. In one embodiment, a system for photorefractive treatment of presbyopia includes a laser source configured for ablating corneal tissue and a control system in communication with the laser source and configured to control the laser source to ablate conical tissue of a patient to achieve a desired corneal shape. In some instances, the control system controls the laser source by calculating a global optimum regarding curvature and asphericity of the cornea. In some instances, control system controls the laser source by calculating a central steep island and calculating a curvature and asphericity for the rest of the cornea. In some embodiments, a laser source is controlled to ablate the cornea of the patient in accordance with a calculated shape profile to achieve a desired corneal shape.

Abstract: Systems and methods for treating presbyopia are provided. In one embodiment, a system for photorefractive treatment of presbyopia includes a laser source configured for ablating corneal tissue and a control system in communication with the laser source and configured to control the laser source to ablate conical tissue of a patient to achieve a desired corneal shape. In some instances, the control system controls the laser source by calculating a global optimum regarding curvature and asphericity of the cornea. In some instances, control system controls the laser source by calculating a central steep island and calculating a curvature and asphericity for the rest of the cornea. In some embodiments, a laser source is controlled to ablate the cornea of the patient in accordance with a calculated shape profile to achieve a desired corneal shape.

Abstract: A method of generating a computer program for control of an apparatus for photorefractive treatment of presbyopia by ablation of corneal tissue or a contact lens, comprising the following steps: (a) electing an eye model, (b) measuring the pupil diameter of the patient at far distance mesopically and at short distance photopically, (c) selecting wanted short and far distances regarding optimum sight, (d) calculating a global optimum regarding curvature (1/R) and asphericity (Q) of the cornea on the basis of the results obtained in steps (a) (b) and (c) by means of optical ray tracing and minimal spot diameter at the retina, and (e) deriving the computer program in accordance with the results of step (d). Alternatively step (d) includes determining a central steep island with a diameter in the range of 2 to 4 millimeters at the cornea and calculating a curvature and asphericity in the rest of the cornea.