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Randomized Controlled Trial
. 2011 Dec;8(12):e1001136.
doi: 10.1371/journal.pmed.1001136. Epub 2011 Dec 13.

Surgery versus epilation for the treatment of minor trichiasis in Ethiopia: a randomised controlled noninferiority trial

Saul N Rajak  1 , Esmael Habtamu, Helen A Weiss, Amir Bedri Kello, Teshome Gebre, Asrat Genet, Robin L Bailey, David C W Mabey, Peng T Khaw, Clare E Gilbert, Paul M Emerson, Matthew J Burton
Affiliations
Randomized Controlled Trial

Surgery versus epilation for the treatment of minor trichiasis in Ethiopia: a randomised controlled noninferiority trial

Saul N Rajak et al. PLoS Med. 2011 Dec.

Abstract

Background: Trachomatous trichiasis can cause corneal damage and visual impairment. WHO recommends surgery for all cases. However, in many regions surgical provision is inadequate and patients frequently decline. Self-epilation is common and was associated with comparable outcomes to surgery in nonrandomised studies for minor trichiasis (<six lashes touching eye). This trial investigated whether epilation is noninferior to surgery for managing minor trichiasis.

Methods and findings: 1,300 individuals with minor trichiasis from Amhara Regional State, Ethiopia were recruited and randomly assigned (1:1) to receive trichiasis surgery or epilation. The epilation group were given new forceps and epilation training. The surgical group received trichiasis surgery. Participants were examined every 6 months for 2 years by clinicians masked to allocation, with 93.5% follow-up at 24 months. The primary outcome measure ("failure") was ≥five lashes touching the eye or receiving trichiasis surgery during 24 months of follow-up, and was assessed for noninferiority with a 10% prespecified noninferiority margin. Secondary outcomes included number of lashes touching, time to failure, and changes in visual acuity and corneal opacity. Cumulative risk of failure over 24 months was 13.2% in the epilation group and 2.2% in the surgical group (risk difference = 11%). The 95% confidence interval (8.1%-13.9%) includes the 10% noninferiority margin. Mean number of lashes touching the eye was greater in the epilation group than the surgery group (at 24 months 0.95 versus 0.09, respectively; p<0.001); there was no difference in change in visual acuity or corneal opacity between the two groups.

Conclusions: This trial was inconclusive regarding inferiority of epilation to surgery for the treatment of minor trichiasis, relative to the prespecified margin. Epilation had a comparable effect to surgery on visual acuity and corneal outcomes. We suggest that surgery be performed whenever possible but epilation be used for treatment of minor trichiasis patients without access to or declining surgery.

Trial registration: ClinicalTrials.gov NCT00522912.

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Conflict of interest statement

PTK is a member of the Scientific Advisory Boards for Alcon and Bausch & Lomb. All other authors have declared that no competing interests exist.

Figures

Figure 1
Figure 1. Trial profile.
Figure 2
Figure 2. Kaplan Meier graph of time to failure.
See this image and copyright information in PMC

References

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