aspheric designs, principles of fitting, fluorescein patterns, photorefractive surgery, diabetes and red eye.

A second research interest since 1988 has been in Optical Information Processing, specifically real-time holography using photorefractive materials.

Photorefractive keratectomy (PRK) This uses a laser to remove tissue from, and reshape the cornea.

Other techniques to correct myopia include photorefractive keratectomy (PRK), radial keratomy (RK), laser epithelial keratomileusis (LASEK), intraocular lens implants and intrastromal corneal rings.