Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/27035

TitleAn assessment of the optimal lens fit rate in keratoconus subjects using three-point-touch and apical touch fitting approaches with the rose K2 lens
Author(s)Romero-Jimenez, Miguel
Santodomingo-Rubido, Jacinto
González-Méijome, José Manuel
KeywordsKeratoconus
Cornea
RGP
Contact lenses
Contact lens fitting
Issue date2013
PublisherLippincott, Williams & Wilkins
JournalEye and Contact Lens
Abstract(s)Objectives: To compare the number of ordered lenses required to achieve an optimal lens fit between three-point-touch and apical touch fittings in keratoconus subjects with nipple and oval cones using the first definite apical clearance lens (FDACL) as a starting point. Methods: First trial lens was selected following manufacturer’s guidelines and the back optic zone radius (BOZR) was flattened or steepened in 0.10 mm steps until a FDACL was found. Subsequently, subjects were randomly allocated to three-point-touch (BOZR 0.10 mm flatter than FDACL) and apical touch fittings (BOZR 0.40 mm flatter than FDACL). Changes were made solely in total lens diameter, edge lift, and/or back vertex power until an optimal lens fit was achieved. Differences between fitting approaches were compared in terms of optimal lens fit rates defined as the percentage of subjects successfully fitted with the first lens ordered from the manufacturer. Results: Sixty-one subjects (109 eyes) were randomly allocated to threepoint- touch and apical touch fitting approaches. An average of 2.3 trial lenses were necessary to achieve the FDACL. An optimal lens fit rate was achieved with the first lens in 84 of 109 eyes (77%). No statistically significant differences in optimal lens fit rates were found between three-point-touch and apical touch fitting approaches (83% and 71%, respectively; P = 0.12) and between nipple and oval cones (81% and 68%, respectively; P = 0.12). Conclusions: The use of the FDACL provides a systematic, reliable, and repeatable starting point for Rose K2 contact lens fitting in keratoconus. Eye care practitioners should anticipate higher optimal lens fit rates when using three-point-touch (83%) in comparison with apical touch contact lens fittings (71%).
TypeArticle
URIhttp://hdl.handle.net/1822/27035
DOI10.1097/ICL.0b013e318295b4f4
ISSN1542-2321
1542-233X
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:CDF - OCV - Artigos/Papers (with refereeing)

Files in This Item:
File Description SizeFormat 
5.5.86. ROMERO-JIMENEZ_13_ECL (Rose K2 Fitting).pdf
  Restricted access
112,71 kBAdobe PDFView/Open

Partilhe no FacebookPartilhe no TwitterPartilhe no DeliciousPartilhe no LinkedInPartilhe no DiggAdicionar ao Google BookmarksPartilhe no MySpacePartilhe no Orkut
Exporte no formato BibTex mendeley Exporte no formato Endnote Adicione ao seu ORCID