PubMed · 8261601
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O D Solomon. 1993. Micropachometry.. https://pubmed.ncbi.nlm.nih.gov/8261601/
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Microbial keratitis can occur in association with contact lens wear. The absolute risk of infection is low but may be enhanced as a consequence of increased exposure to potentially pathogenic microbes in a hospital setting. There is variation in risk depending on type of lens worn and its modality of use. Extended-wear lenses carry the greatest risk. Pseudomonas aeruginosa and Acanthamoeba are causes of potentially devastating ocular infections in contact lens wearers. The risk of these infections could be reduced by fastidious hygiene practice. Hydrogen peroxide disinfection is recommended when a storage case is included in the care regimen. This should be cleaned thoroughly and dried prior to disinfection and never exposed to tap water. Daily wear of one-day 'disposable' soft contact lenses or use of rigid gas permeable lenses is recommended for hospital staff. Contact lenses should be removed immediately and discarded or disinfected if the eye becomes contaminated and/or use of an eyewash is required.
A survey of ophthalmic decontamination protocols in eight district hospitals was undertaken. Procedures differed widely. A literature search revealed only four publications on the subject, all of which dealt with tonometer head disinfection only. After discussion with several manufacturers, whose advice was restricted largely to acrylic lens disinfection and which varied considerably, a local policy for ophthalmic decontamination was established. Nationally agreed disinfection guidelines for high risk ophthalmic instruments are needed.
Advances in accuracy of the measurement of corneal topography have made it possible to design contact lenses whose posterior surface is based on the corneal contour. Our goal is to design a contact lens of focal length, f, given an arbitrarily shaped posterior surface without assuming rotational symmetry. The shape of the anterior surface is calculated using the principle of least time, thereby going beyond paraxial assumptions and the thin lens approximation. There is no requirement that the reference ray be normal to either the anterior or posterior surface of the lens.