Ento Key

Introduction The vast majority of soft contact lenses are today mass produced by a double-sided moulding process (see Chapter 5 ). Using such a method of manufacture ensures relatively consistent…

Introduction Daily disposable lenses are one of the two versions of true, single-use-only, contact lenses – the other being extended-wear lenses. Daily disposable lenses first became available in 1994. The…

Introduction A significant proportion of the population participates in sports or leisure-time physical activities. For example, a world-wide metaanalysis found that among adults, walking was the most popular activity in…

Introduction The use of rigid toric corneal lenses (in preference to rigid spherical corneal lenses) is indicated under the following circumstances: 1. To improve the vision in cases where a…

Introduction This chapter reviews the care systems used with rigid contact lenses. Of course, many of the general principles of contact lens care, such as the rationale for lens cleaning…

Introduction With the very notable exceptions of daily disposable lenses and extended-wear lenses that are discarded after each period of continuous wear, all contact lenses must be subjected to some…

Introduction In contrast to soft lenses (see Chapter 7), rigid contact lenses are individually fitted and then lathe cut to meet particular optical, geometrical and material specifications. Although the manufacturing…

Introduction Rigid lens materials have played an important role in the development of rigid contact lenses generally and occupy a small but significant place in the range of currently available…

Introduction Unlike soft lenses, which drape to fit the cornea so that on the eye the geometry of the back surface closely conforms to that of the anterior cornea, the…

Introduction Although lathing technology has been used to fabricate contact lenses since their invention over 130 years ago, developments over the past quarter of a century in precision engineering, materials…