International ophthalmology · 2026
From synthetic to biological rings: CAIRS for visual preservation after PMMA ICRS extrusion in keratoconus, a case report.
Клинический случайПисьмо в редакциюНазвание и аннотация: Перевод в очереди
Обработка статьи · этапы, ошибки и управление
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Ошибки и ограничения
История · было → стало
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Barbara Adel, Barbara Ramez
Аннотация
PURPOSE: To report the outcome of partial replacement of an extruded PMMA intracorneal ring segment (ICRS) with corneal allogenic intrastromal ring segment (CAIRS) in advanced keratoconus.
CASE PRESENTATION: A patient with advanced keratoconus previously treated with a pair of Ferrara ring segments, achieved stable visual improvement for over 20 years. In 2024, extrusion of one segment occurred. The extruded PMMA segment was removed and replaced with a full-thickness CAIRS, while the second segment was left in situ. Despite technical challenges in adapting the CAIRS to the pre-existing tunnel, implantation was successful and visual acuity was preserved.
CONCLUSION: Partial exchange of an extruded ICRS with CAIRS is feasible and may maintain prior visual and biomechanical gains, offering an alternative to complete segment removal in selected cases.
CASE PRESENTATION: A patient with advanced keratoconus previously treated with a pair of Ferrara ring segments, achieved stable visual improvement for over 20 years. In 2024, extrusion of one segment occurred. The extruded PMMA segment was removed and replaced with a full-thickness CAIRS, while the second segment was left in situ. Despite technical challenges in adapting the CAIRS to the pre-existing tunnel, implantation was successful and visual acuity was preserved.
CONCLUSION: Partial exchange of an extruded ICRS with CAIRS is feasible and may maintain prior visual and biomechanical gains, offering an alternative to complete segment removal in selected cases.