Introduction Keratoconus (KC) is a term derived from the Greek words keras (cornea) and konos (cone). It was described by Dr Benedict Duddell in 1736 and increasingly described further over the following 100 years with a variety of names including…
Introduction In 1996, Dr Tom Reim of Melbourne, Florida, had an idea that changed orthokeratology forever: He designed a lens with a small (0.60 mm) reverse curve (RC) and added a wide alignment curve to overcome the centration problems that were…
Introduction Successful contact lens fitting requires the manufacture of high-precision contact lenses and the establishment of meaningful tolerances. Such tolerances are established by national and international standards organisations. Poor-quality contact lenses can compromise wearing comfort. Contact lenses therefore have to…
Introduction: Topical Ocular Medications and Contact Lens Wear It is generally agreed that the concurrent use of particularly soft contact lenses and topical pharmaceutical agents in not advisable due to concerns regarding changes to the contact lenses and toxicity to…
Introduction Contact lens aftercare is the key to developing good lens performance and sustaining ocular tissue health; successful contact lens practice depends on this. It provides an opportunity not only to modify lenses and maintenance methods, but also to solve…
Patient management is the process of careful investigation before a patient is fitted with contact lenses and maintaining successful wear afterwards. It is a means of informing, examining and selecting potential wearers, as well as anticipating or investigating possible causes…
Introduction and History A scleral contact lens rests solely on the sclera. It is intended to vault the cornea in its entirety and to retain a fluid reservoir between the lens and the eye ( Fig. 14.1 ). Scleral lenses…
Introduction Presbyopia, resulting from a gradual decrement in visual function at near, is one of the most prevalent ocular conditions resulting in patient complaints and dissatisfaction in the 40 and older age group. Nevertheless, it also represents an outstanding opportunity…
Introduction The concept of extended wear (up to 1 week) or continuous wear (up to 1 month) holds considerable appeal for contact lens wearers because it brings them close to the world of the nonwearer. Being able to see clearly,…
Fitting Rigid Toric Lenses Indications for the use of rigid toric lenses Rigid toric lenses are indicated in preference to rigid spherical lenses under the following circumstances: ■ to improve vision in cases where a lens employing spherical front and…