Pupil diameter and centring vary with lighting, accommodation and measurement conditions, which directly alters the Zernike coefficients and the refraction. This tool exactly recomputes the wavefront coefficients (OSA/ANSI standard, up to the 8th radial order) for a new pupil geometry, through an analytical polynomial re-expansion without interpolation or approximation. It derives the objective refraction before and after transformation, and simulates the retinal image quality by PSF convolution to visualise the optical consequences of a pupil change.
Key features
- Exact analytical transformation of Zernike coefficients (up to the 8th radial order)
- Pupil-diameter reduction and arbitrary decentration (polar or Cartesian coordinates)
- Objective refraction (sphere, cylinder, axis) for the initial and transformed wavefront
- Wavefront visualisation with RMS comparison (initial vs transformed)
- Retinal image simulation by PSF convolution (monochromatic and polychromatic)
- Bilingual interface (French/English), standalone, no server required