| 摘要 |
Improved refractive eye surgery methods, apparatus and systems employ ablative photodecomposition of a cornea to mitigate and/or inhibit presbyopia with minimal vision degradation. A method for treating a cornea includes ablating a superior area of the cornea to enhance near-distance vision and ablating an inferior area of the cornea to enhance far-distance vision. Typically, the inferior area corresponds to an area of the cornea that is blocked (generally by the lower eyelid and/or cheek) from viewing objects when the eye is facing downward. The superior area corresponds to an area of the cornea that is blocked from viewing objects (generally by the patient's upper eyelid) when the eye is facing forward or slightly above the horizon. In some embodiments, a transition zone is ablated between the superior and inferior areas, to enable a smoother visual transition between the two areas. |
