[Skip to Content]
Access to paid content on this site is currently suspended due to excessive activity being detected from your IP address 54.145.232.99. Please contact the publisher to request reinstatement.
[Skip to Content Landing]
Article
April 1993

Ulcerative Keratitis and Disposable Lenses

Author Affiliations

San Francisco, Calif

Arch Ophthalmol. 1993;111(4):431-432. doi:10.1001/archopht.1993.01090040021014
Abstract

However, the wearing regimen was not taken into account when comparing the two groups, which was a critical omission by the investigators, leading to a skewed result delineating lens type (disposable lenses). In a recent letter,2 Ederer and Ferris wrote, "The choice of controls in casecontrol studies is one of the most formidable problems in epidemiologic practice. The controls, except for the disease under study, should be as similar to the cases as possible. If the cases are drawn from a clinic population, then the controls should be chosen so as to duplicate the selective factors which brought the cases to the clinic." Thus, if the case patient has worn the lenses on a continuous basis without nightly removal, so should the controls regardless of lens type.

Considering the failure of the investigators to consider this aspect of lens wear in choosing controls, I do not believe that they

First Page Preview View Large
First page PDF preview
First page PDF preview
×