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Two common surgeries equally effective for treating blinding condition of the eyelid
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<span>Two common surgeries equally effective for treating blinding condition of the eyelid</span>
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NIH-funded study supports no change to surgical technique for trichiasis management
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September 17, 2024
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<img src="https://www.nei.nih.gov/sites/default/files/styles/small/public/2024-09/surgery4.jpeg?itok=geXHA3dF" alt="Three surgeons conducting eye surgery in a small room." width="3710" height="2473">
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<p>Three surgeons perform trichiasis surgery at a health post in Ethiopia. Image courtesy of Emily Gower, Ph.D., University of North Carolina, Chapel Hill.</p>
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<p>Trachomatous trichiasis, a potentially blinding condition where inward-turned eyelashes scratch the front of the eye, can successfully be treated by either of the two most common types of eyelid surgery, according to findings from a large comparison trial funded by the National Institutes of Health. In light of previous, smaller studies, which suggested that one of the commonly used surgery types had poorer outcomes, this study provides reassurance that either technique can treat the condition. The study, published in PLOS Neglected Tropical Diseases, was supported by the National Eye Institute (NEI), part of NIH.</p><p>“Some studies have reported post-operative trichiasis rates of 30% or higher for patients with trachomatous trichiasis following surgery, and repeat surgeries are more difficult,” said Emily Gower, Ph.D., University of North Carolina at Chapel Hill. “This trial sought to determine if we could decrease the risk of post-operative trichiasis by modifying the surgical procedure. We found that existing approaches result in better outcomes.”</p><p>Trachomatous trichiasis affects approximately 1.7 million people worldwide, mostly in poor and rural areas of Africa. The condition arises after repeated or chronic eye infections with the bacteria Chlamydia trachomatis, which is spread by person-to-person contact. Trachoma is very common in hot, dry areas of the world, and repeat infections can eventually lead to scarring and malformation of the eyelid. This malformation causes the edge of the eyelid to draw inward, so that eyelashes scratch the eye. If left untreated, trichiasis can result in corneal clouding, and eventually blindness.</p>
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<img src="https://www.nei.nih.gov/sites/default/files/styles/large/public/2024-09/trichiasis%20schematic2.png?itok=_R0iXXIk" alt="Schematic of trichiasis surgery." width="9250" height="4080">
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<p>On a normal eyelid (left), eyelashes are turned outward away from the cornea. Eyelids affected by trichiasis (center) have eyelashes touching the eye. Surgery for eyelids affected by trichiasis (right), rotates the eyelash away from the cornea, returning them to their normal anatomic position. Surgical incisions were placed at either 3 mm or 5 mm away from the eyelid margin.</p>
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<p>The most common and effective treatment for trichiasis is surgery to correct the in-turning of the eyelid, which typically is performed in one of two different ways. A few smaller studies indicated that one of the surgery methods, posterior lamellar tarsal rotation (PLTR), might be more effective, so some programs in Africa began retraining surgeons to perform that method. Additionally, previous analysis of eyelids treated with the other surgery, bilamellar tarsal rotation (BLTR), suggested that placing the surgical incision slightly further from the edge of the eyelid (5 millimeters above the lid margin instead of 3 mm) might lead to fewer recurrences, but this change had not previously been tested. The current study directly compared these three surgery approaches and evaluated the risk of post-operative trichiasis.</p>
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<p>Clinical study workers traversing muddy road in Ethiopia. Image courtesy of Emily Gower, Ph.D., University of North Carolina, Chapel Hill.</p>
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<p>The study, which took place in southern Ethiopia, enrolled 4,914 patients with trichiasis in one or both eyes (6,940 eligible eyes). The participants were randomized to receive BLTR at 3 mm incision height, BLTR at 5 mm incision height, or PLTR. Researchers rechecked the patients for post-operative trichiasis at six weeks and again at 12-18 months. On average, approximately 17% of eyelids had post-operative trichiasis. There was no difference in risk of post-operative trichiasis between the two methods with a 3 mm incision height, while those who received the 5 mm incision height BLTR were significantly more likely to have post-operative trichiasis. The results indicate that the current standard surgeries – either method at 3 mm – are better options for trichiasis treatment than the 5 mm method.</p><p>The study was funded by NEI grant UG1EY025992 and carries clinical trial registration number <a href="https://clinicaltrials.gov/study/NCT03100747">NCT03100747</a>.</p><p>Reference:<br>Gower EW, Sisay A, Bayissasse B, Seyum D, Weaver J, Munos B, Keil AP, Bankoski A, Sullivan KM, Kana H, Admassu F, Tadesse D, and Merbs SL. “The impact of modified incision height and surgical procedure on trichiasis surgery outcomes: Results of the Maximizing Trichiasis Surgery Success (MTSS) Randomized Trial.” PLOS NTD. Sep 17, 2024. <a href="https://journals.plos.org/plosntds/article?id=10.1371/journal.pntd.0012034">https://journals.plos.org/plosntds/article?id=10.1371/journal.pntd.0012034</a></p><hr><p>NEI leads the federal government’s efforts to eliminate vision loss and improve quality of life through vision research…driving innovation, fostering collaboration, expanding the vision workforce, and educating the public and key stakeholders. NEI supports basic and clinical science programs to develop sight-saving treatments and to broaden opportunities for people with vision impairment. For more information, visit <a href="/">https://www.nei.nih.gov</a>.</p><p>About the National Institutes of Health (NIH): NIH, the nation’s medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit <a href="https://www.nih.gov/">https://www.nih.gov/</a>.</p><p>NIH…Turning Discovery Into Health®</p>
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