New lens may be good news for RK radial keratotomy patients with cataracts
Patients with RK surgery typically have aberrations in corneal shape due to multiple incisions. This typically degrades image quality causing glare, haloes and distorted vision, particularly at night when the pupil may be dilated.
RK patients having cataract surgery are faced with two issues;
1. Lens predictive formulae are less accurate in RK eyes even when using post RK adjustments.
2. Corneal distortion still leads to decreased visual quality.
A new small aperture lens - the IC8 lens by Acufocus - may be very useful in RK patients, offering a pinhole effect that largely eliminates corneal distortion whilst increasing depth of focus.
Lens prediction may still be a problem, but can be refined by laser surgery after lens insertion. One limitation is that the IC8 can only be used in one eye at the present time. This may change with time and more experience of the lens by surgeons. The lens can be removed if found to be poorly tolerated.