Introduction Eye colour is universally recognized as an important and defining natural physical characteristic of the body human, and a contact lens is an effective vehicle for modifying or enhancing…

Introduction The preliminary examination includes the taking of a full history and initial patient assessment (see Chapter 33 ), ocular measurements, refraction, slit-lamp biomicroscopy and additional tests. The examination enables…

Introduction The contact lens practitioner is a key member of a multidisciplinary team involving paediatric ophthalmologists, optometrists and orthoptists concerned with ocular health and visual development of the child. Fitting…

Introduction Rather than using contact lenses to add a new refracting surface to the eye to correct ametropia, in orthokeratology (OK), specially designed rigid contact lenses are instead used to…

Introduction Congenital or developmental abnormalities of corneal topography include primary corneal ectasias, such as keratoconus and keratoglobus, and cornea plana ( Fig. 25.1 ). These atypical corneal shapes provide significant…

Introduction Contact lens practice resides within a general eye care practice embracing the prescribing, fitting, dispensing and long-term management of contact lens-wearing patients. Thus practice management issues that have an…

Introduction Diabetes mellitus is one of the most common systemic diseases in the world and it occurs when the pancreas does not produce enough insulin or when the body cannot…

Introduction Fitting rigid corneal lenses is an improbable achievement. Essentially, it involves constructing a complex three-dimensional structure to sit, without the aid of any supplementary adhesive, on a vertically inclined…

Introduction Myopia is a commonly seen condition and is the most important cause of distance vision impairment. Data from many East Asian countries show a consistent rise in the prevalence…

Introduction and Historical Overview Scleral lenses were the first contact lenses used to protect the ocular surface, restore vision in keratoconus and correct simple ametropia ( ). Initially manufactured in…