Management of keratoconus: Comparative visual assessments

Carney, Leo G. & Lembach, Richard G. (1991) Management of keratoconus: Comparative visual assessments. The CLAO journal : official publication of the Contact Lens Association of Ophthalmologists, 17(1), pp. 52-58.



We compared the visual performance of keratoconus patients whose vision had been corrected with one of the following: RGP lenses alone, penetrating keratoplasty, or epikeratoplasty. Despite similar Snellen visual acuities with optimal correction, significant differences in visual performance were found in the three groups. Visual performance was assessed by measuring contrast thresholds for electronically-generated sinusoidal gratings and by measuring contrast thresholds in the presence of a glare source. These measurements were carried out on six bilateral keratoconus patients such that three eyes were corrected with RGP lenses alone, five eyes were corrected by penetrating keratoplasty, and four eyes by epikeratoplasty. There were statistically significant differences in the visual responses for the three correction types (ANOVA, F2,45 = 5.755, P = 0.0059), with the epikeratoplasty procedure providing the poorest results. Visual performance was further affected in the presence of a glare source. Statistically significant group differences were again found (ANOVA, F2,45 = 7.593, P = 0.0014), with the penetrating keratoplasty eyes being the most affected. These differences were spatial frequency dependent (p = 0.0293), the effect being most marked at medium spatial frequencies. These findings provide a ranking of the quality of vision provided by each management strategy

Impact and interest:

13 citations in Scopus
Search Google Scholar™

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

Full-text downloads:

165 since deposited on 31 Jan 2006
2 in the past twelve months

Full-text downloads displays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.

ID Code: 3136
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: Contact Lenses, Keratoplasty, Penetrating, Keratoconus/, therapy, Adult, Analysis of Variance, Comparative Study, Contrast Sensitivity, Female, Humans, Keratoconus/surgery, Male, Middle Aged, Research Support, Non, U, S, Gov't, Research Support, U, S, Gov't, P, H, S, Sensory Thresholds, Visual Acuity
ISSN: 0733-8902
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 1991 Contact Lens Association of Ophthalmologists
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 31 Jan 2006 00:00
Last Modified: 09 Jun 2010 12:29

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page