Dr Grant Hannaford is a senior lecturer at the School of Optometry and Vision Science UNSW and co-owns Hannaford Eyewear and the Academy of Advanced Ophthalmic Optics. He was Silmo and The International Opticians’ Association’s 2022 International Optician of the Year and researches emmetropisation and ocular biometric development in children, as well as lens design.
3 articles
Perceived ‘distortion’ in spectacle wear is not a single entity but a combination of prismatic effects, magnification, off-axis aberrations and position-of-wear changes. Patients often mislabel blur, tilt, or instability as distortion. Accurate clinical management depends on distinguishing true spat
This is the first of a two-part series explaining the optical mechanisms and perceptual interpretations of distortion. Part two will examine clinical strategies to resolve distortion. As prescriptions
For kids, accuracy in lens power is about achieving clear vision and supporting good visual development
