Descriptive analysis of the type and design of contact lenses fitted according to keratoconus severity and morphology

Descriptive analysis of the type and design of contact lenses fitted according to keratoconus severity and morphology

Author Lunardi, Leticia Helena Autor UNIFESP Google Scholar
Arroyo, Danielle Autor UNIFESP Google Scholar
de Andrade Sobrinho, Marcelo Vicente Autor UNIFESP Google Scholar
Lipener, Cesar Autor UNIFESP Google Scholar
da Silva Rosa, Juliana Maria Autor UNIFESP Google Scholar
Abstract Purpose: Keratoconus is characterized by bilateral asymmetrical corneal ectasia that leads to inferior stromal thinning and corneal protrusion. There is currently a lack of consensus regarding the most efficacious method for fitting contact lenses in patients with keratoconus, given the various topographical patterns and evolution grades observed in affected populations. The purpose of the present study was to evaluate the association between keratoconus evolution grade and topography pattern and the type and design of fitted contact lens. Methods: We performed a retrospective analysis of contact lenses fitted in a total of 185 patients with keratoconus (325 eyes). Keratoconus was classified as either grade I, II, III, or IV based on keratometry and cone morphology (nipple, oval, globus, or indeterminate) results. Results: A total of 325 eyes were evaluated in the present study. Of the 62 eyes classified as grade I, 66.1% were fitted with monocurve contact lenses. Of the 162 eyes classified as grade I and II, 51%, 30%, and 19% were fitted with adapted monocurve rigid gas-permeable contact lenses (RGPCL), bicurve lenses, and others lens types, respectively. Bicurve lenses were fitted in 52.1% and 62.2% of eyes classified as grade III and IV, respectively. Of the eyes classified as grade III and IV, monocurve and bicurve RGPCL were fitted in 26% and 55%, respectively. In eyes with oval keratoconus, 45%, 35%, and 20% were fitted with monocurve lenses, bicurve lenses, and other lens types, respectively. In eyes with round cones (nipple morphology), 55%, 30%, and 15% were fitted with bicurve lenses, monocurve lenses, and other lens types, respectively. Conclusion: Monocurve RGPCL were most frequently fitted in patients with mild to moderate keratoconus and oval cones morphology, while bicurve lenses were more frequently fitted in patients with severe and advanced keratoconus. This was probably because bicurve lenses are more appropriate for round cones due to increased corneal asphericity.
Keywords Corneal diseases
Keratoconus
Keratoconus/classification
Contact lenses
Equipment design
xmlui.dri2xhtml.METS-1.0.item-coverage Sao Paulo
Language English
Date 2016
Published in Arquivos Brasileiros De Oftalmologia. Sao Paulo, v. 79, n. 2, p. 82-84, 2016.
ISSN 0004-2749 (Sherpa/Romeo, impact factor)
Publisher Consel Brasil Oftalmologia
Extent 82-84
Origin http://dx.doi.org/10.5935/0004-2749.20160025
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000377714700005
SciELO ID S0004-27492016000200082 (statistics in SciELO)
URI https://repositorio.unifesp.br/handle/11600/57819

Show full item record




File

Name: S0004-27492016000200082-en.pdf
Size: 163.0Kb
Format: PDF
Description:
Open file

This item appears in the following Collection(s)

Search


Browse

Statistics

My Account