Masking of irregular corneal topography with contact lenses

Griffiths, Monique, Zahner, Kylie, Collins, Michael J., & Carney, Leo G. (1998) Masking of irregular corneal topography with contact lenses. The CLAO Journal : Official Publication Of The Contact Lens Association Of Ophthalmologists, 24(2), pp. 76-81.


PURPOSE: We examined the effectiveness of various types of contact lenses in masking irregular corneal topography using videokeratoscopy, residual aberrations, and measurement of visual acuity. METHODS: Thirteen subjects with differing degrees of keratoconus were recruited. Four types of soft lenses were used that varied in both thickness and water content, along with a rigid gas permeable (RGP) and a flexible gas permeable contact lens. RESULTS: RGP contact lenses provided the best visual acuity and the least residual aberrations. Flexible gas permeable lenses showed a reasonable masking of corneal distortion but did not provide the expected improvement in visual acuity. Soft contact lenses provided marginally better visual acuity than spectacle correction, but the level of residual aberrations was still high, even for relatively thick soft lenses (up to 0.2 mm). A significant correlation existed between the regularity of the front surface of the contact lenses on the eye and visual acuity in low illumination. CONCLUSIONS: Among the currently available contact lens materials, RGP lenses provide the best visual performance for subjects with keratoconus.

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ID Code: 1460
Item Type: Journal Article
Refereed: Yes
Additional Information: For more information, please refer to the journal’s website (see link) or contact the author. Michael Collins, email:,.au
Additional URLs:
ISSN: 1542-2321
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 1998 Lippincott Williams & Wilkins
Deposited On: 01 Jul 2005 00:00
Last Modified: 15 Jan 2009 06:39

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