Introduction The human eye is a remarkable optical instrument ( ). Its performance has been honed by millennia of evolution to meet admirably the needs of the neural system that it serves. At its best, few human-engineered photographic lens systems…
Introduction A critical aspect of contact lens practice is monitoring the ocular response to lens wear, which ranges from acceptable physiological changes to adverse pathology. To do this, practitioners must possess a thorough understanding of the normal structure and function…
Introduction We cannot continue these brilliant successes in the future, unless we continue to learn from the past . Calvin Coolidge, inaugural US presidential address, 1923 Coolidge was referring to the successes of a nation, but his sentiment could apply…
Application of Grading Scales Patient management is based on how much the normal ocular appearance has changed. In general, a rating of slight (grade 2) or less is considered within normal limits for a population (except staining). A change of…
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Chapter 2 – Materials Nature of polymers Perhaps the best way of visualising the way in which polymer chains arrange themselves is by taking several pieces of string to represent individual molecules. The usual arrangement is random, with the pieces…
The History of Contact Lenses Timothy Bowden Jacqueline Lamb Impression Materials Josef Dallos was the first to successfully take an impression of a living eye and use this mould to make a cast and from that cast make a lens. He was…
The Importance of the Practitioner Being Able to Carry Out Modifications Nowadays, when modifications can be carried out relatively quickly and cheaply by laboratories, it is often difficult to impress on students, and even qualified practitioners, the following reasons why…
There are several advantages to undertaking research in everyday practice rather than in an academic setting. The depth of experience of a full-time practitioner may be more attuned to clinical trends that deserve further investigation. Patients in a normal contact…
This chapter will endeavour to cover the legal aspects of fitting and prescribing contact lenses. To do this, an explanation of the tort of negligence (malpractice) is required with recent precedent case law. This is the basis of most claims…