Electromechanical systems resonator structures, devices, circuits, and systems are disclosed. A rotor with a cylindrical outer surface is secured in offset position within the chamber. A desired presbyopia-mitigating quantity of high-order spherical aberration may be defined by one or more spherical Zernike coefficients, which may be combined with Zernike coefficients generated from a wavefront aberrometer. The attenuation characteristics of the first section are chosen such that the intensity of the optical radiation at the probe wavelength that reaches the second section is below the threshold for the onset of non-linear effects of the second section. The mixing and dispensing system includes a mixing nozzle that has a locking feature such that an elevated blocking surface directly faces the inlet of pressurized diluent to create turbulence. However, the seat may remain in the front position to operate the specific function for the backhoe bucket.