An apparatus for customized refractive surgery includes a control unit (1) and a corneal topographer (2), for morphologically determining a corneal front surface of an eye. The control unit is provided with a first calculating unit, for determining a corneal ideal surface, on the basis of refraction values of the eye, which are measurable by subjective refraction or by objective refraction moreover, the control unit includes a second calculating unit for determining an ablating volume, on the basis of the corneal front surface, of the corneal ideal surface and of an intersection thereof.
