[Comment on: "The reproducibility of a new power mapping instrument based on the phase shifting schlieren method for the measurement of spherical and toric contact lenses"].
2010; Elsevier BV; Volume: 33; Issue: 3 Linguagem: Inglês
10.1016/j.clae.2010.03.003
ISSN1476-5411
Autores Tópico(s)Ocular Surface and Contact Lens
ResumoIt is now 45 years since Otto Wichterle, inventor of the hydrogel contact lens, published the first equation for the conversion of its back vertex power measured in saline to the corresponding power in air [ [1] Wichterle O. Les lentilles de contact souples ‘Geltakt’: problèmes techniques et chimiques. Les Cahiers des Verres de Contact. 1965; : 4-7 Google Scholar ]. Equations subsequently devised for the same purpose by Patel et al. [ [2] Patel S. Kayani C. Birbeck F. Speller J. An improved immersion method of soft lens power assessment. Part 1. Theoretical consideration. J Br Contact Lens Assoc. 1985; 8: 53-57 Abstract Full Text PDF Scopus (5) Google Scholar ] and Hough et al. [ [3] Hough T. Livnat A. Keren E. Inter-laboratory reproducibility of power measurement of toric hydrogel lenses using the focimeter and the Moiré deflectometer. J Br Contact Lens Assoc. 1996; 19: 117-127 Abstract Full Text PDF Google Scholar ], in common Wichterle's, allow for the presence of the cuvette, or wet cell, in which the lens has been measured. Other equations have been offered including those of Campbell [ [4] Campbell C.E. Converting wet cell measured soft lens power to vertex power in air. Int Contact Lens Clin. 1984; 11: 168-171 Google Scholar ] and Harris et al. [ [5] Harris M.G. Hall K. Oye R. The measurement and stability of hydrophilic lens dimensions. Am J Optom Arch Am Acad Optom. 1973; 50: 546-552 Crossref PubMed Scopus (15) Google Scholar ].
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