To investigate the effect of orthokeratology
on peripheral aberrations
in two myopic volunteers.
The subjects wore reverse geometry orthokeratology
lenses overnight and were monitored for 2 weeks of wear. They underwent corneal topography
, peripheral refraction
(out to ±34° along the horizontal visual field) and peripheral aberration measurements across the 42° × 32° central visual field using a modified Hartmann-Shack aberrometer.
Spherical equivalent refraction was corrected for the central 25° of the visual fields beyond which it gradually returned to its preorthokeratology values. There were increases in axial coma
, spherical aberration, higher order root mean square aberrations
, and total root-mean-squared aberrations
(excluding defocus). The rates of change of vertical and horizontal coma
across the field changed in sign. Total root mean square aberrations
showed a quadratic rate of change across the visual field which was greater subsequent to orthokeratology
can correct peripheral relative hypermetropia it induces dramatic increases in higher-order aberrations
across the field.