By Elisabeth A. W. Millis MB BS DO MRCOphth
This thorough evaluation comprises complete insurance of scientific touch lens perform for these interested in touch lens prescribing, becoming, and care. Designed for simple entry, it provides crucial info in a concise layout that highlights key, need-to-know issues.
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Additional info for Medical Contact Lens Practice
Sample text
Changes in muscle tone may result in entropion or ectropion. Entropion may cause corneal staining as the inturned lashes brush the cornea. This may be relieved by a soft contact lens. In cases of ectropion there is a greater risk of infection because the stagnant pool of tears that forms is readily colonized by microorganisms. 3 It is postulated that this is due to the retention of tears that occurs with advancing years. Both forced and reflex blinking should be examined to ensure proper wetting of the lens.
Carney LG, Mainstone J, Carkeet A, et al. Rigid lens dynamics: lid effects. CLAO J 1997;23:69–77. 2. Jupiter D, Karesh J. Ptosis associated with PMMA/ RGP contact lens wear. CLAO J 1999;25:159–162. Further reading Key J. Comparative study of eyelid cleaning regimens in chronic blepharitis. CLAO J 1996;22:209–212. Greiner JV, Leahy CD, Glonek T, et al. Effects of eyelid scrubbing on the lid margin. CLAO J 1999;25:109–113. 33 35 Chapter 4 Evaluation of the older contact lens patient CHAPTER CONTENTS Ocular characteristics of the aging eye 36 Contact lens correction 37 References 42 Further reading 42 A number of changes, other than presbyopia, occur in the older eye.
In the past it was most often due to PMMA hard lenses, which are not normally fitted now. However, some patients may still be wearing them, and a few see better with PMMA than RGP lenses. 5) if the amount of oxygen transmitted fails to meet corneal needs. The edema characteristically causes central corneal clouding, which is best seen with the lenses removed and using the sclerotic scatter technique with the slit lamp. Blurred vision is particularly noticed when the lenses are removed and replaced by spectacles.