Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/57069

TitleAge-related variations in corneal asphericity and long-term changes
Author(s)Amorim-de-Sousa, Ana
Vieira, Ana Cláudia
González-Méijome, José Manuel
Queirós, A.
KeywordsCorneal topography
Corneal asphericity
Corneal curvature
Corneal changes
Issue date2019
PublisherLippincott, Williams & Wilkins
JournalEye & Contact Lens: Science and Clinical Practice
CitationAmorim-de-Sousa, Ana; Vieira, Ana Cláudia; González-Méijome, José Manuel; Queirós, António. Age-Related Variations in Corneal Asphericity and Long-Term Changes, Eye & Contact Lens: Science & Clinical Practice, 1, 1-1, 2019.
Abstract(s)Purpose: Corneal front-surface asphericity is directly related with the optical quality of the eye and with contact lenses fitting. The purpose of this study was to evaluate the corneal asphericity as a function of age, sex, and refractive error measured with autokeratometry and corneal topography and its long-term changes (5- to 10-year period). Methods: The asphericity and corneal curvature were obtained with the autorefractometer/autokeratometer NIDEK ARK-700A and with the videokeratoscope MODI 2.0 and compared. Corneal asphericity was retrospectively analyzed with NIDEK ARK-700A. The longitudinal study of asphericity was conducted with the same device between 2 appointments within an interval of 5 to 10 years. Results: NIDEK ARK-700A showed agreement of asphericity values with those of MODI 2.0 (P¼0.172) for a 7-mm diameter chord. The mean Q value of 1,484 right eyes (58.6% female), with a mean age of 40.2618.4 years, was 20.2460.12. No differences were found for Q value between sexes (P¼0.424), age groups (P¼0.268), and refractive error groups (P¼0.107). The longitudinal analysis of corneal asphericity in 190 eyes (62.1% female) over a mean period of 5.961.4 years showed no significant differences in the Q value (0.0060.08, P¼0.813) over time. However, 14% showed asphericity changes of 60.10 or higher while 86% of the subjects showed a change below 60.10. Conclusions: The mean Q value observed in this study agrees with the average values of a white population and contributes to slightly reduce the positive spherical aberration of the eye. For the large majority of this population, the asphericity did not show significant changes within a period of 5 to 10 years, but significant changes can be observed in some patients.
TypeArticle
URIhttp://hdl.handle.net/1822/57069
DOI10.1097/ICL.0000000000000540
ISSN1542-2321
e-ISSN1542-233X
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:CDF - OCV - Artigos/Papers (with refereeing)

Files in This Item:
File Description SizeFormat 
5.5.138. AMORIM-DE-SOUSA_18_ECL (Asphericity population).pdf
  Restricted access
302,13 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