Related Experiment Videos
Contact lens failure in keratoconus management
M R Dana1, J L Putz, M A Viana
1Department of Ophthalmology and Visual Sciences, University of Illinois, College of Medicine, Chicago.
Ophthalmology
|August 1, 1992
Summary
Contact lens failure in keratoconus patients often leads to surgery. Key factors include poor vision, high keratometry, older age, and longer disease duration, necessitating penetrating keratoplasty.
Area of Science:
- Ophthalmology
- Corneal Diseases
- Refractive Surgery
Background:
- Keratoconus management often involves contact lenses.
- Surgery, specifically penetrating keratoplasty (PK), is reserved for cases where contact lens wear fails.
Purpose of the Study:
- To identify preoperative patient and ocular factors contributing to contact lens failure in keratoconus.
- To determine the relative importance of these factors in necessitating PK.
Main Methods:
- Retrospective analysis of 99 keratoconic eyes undergoing PK between 1981 and 1990.
- Univariate and multivariate analyses to identify risk factors for contact lens failure.
Main Results:
- Primary reasons for PK included poor best-corrected visual acuity (43%), contact lens intolerance (32%), lens displacement (13%), and corneal thinning (12%).
- Average patient age was 34 years, with average keratometry of 57.5 D.
- Referral source, sex, or prior PK history did not significantly alter failure causes.
Conclusions:
- Poor best-corrected visual acuity, keratometry ≥ 55 D, age ≥ 40 years, and disease duration > 5 years were associated with failure.
- These factors frequently led to PK within 12 months due to poor functional acuity and peripheral thinning.