Abstract
Corneal transplant aims to replace opacified, scarred or deformed cornea with cadaveric donor material. However, there are two clinical scenarios when we need to consider bypassing the ocular surface and cornea with a keratoprosthesis to restore sight in corneal blindness. Where there have been multiple graft failures or a heavily vascularised cornea, and in the presence of adequate tear production and perfect blinking mechanism, a Boston Type 1 keratoprosthesis (BKPro1) may be considered instead of high-risk conventional keratoplasty. BKPro1 is a Polymethylmethacrylate (PMMA) and titanium collar stud device that sandwiches a carrier corneal graft button for full-thickness transplantation. Limbal stem cell deficiency is not a problem, but any degree of keratinisation, tarsal or bulbar, will compromise the outcomes. Were the ocular surface is hostile with keratinisation, and in the presence of a defective lid or blink, an osteo-odonto-keratoprosthesis (OOKP) is indicated. The OOKP is an epicorneal device using a lamina created from the patient’s own canine tooth root and surrounding jawbone to carry a PMMA optical cylinder wrapped with an overlying buccal mucous membrane graft. Keratoprostheses are inherently unstable and should not be used when there is a fellow-seeing eye and should not be implanted bilaterally. Although they may be visually devastating, the rate of complications of keratoprostheses has been significantly reduced by improving the design of the devices and the development of prevention and management protocols for the complications.
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Bani Oraba, S., Liu, C. (2023). What Is New in Keratoprostheses. In: AliĂ³, J.L., del Barrio, J.L.A. (eds) Modern Keratoplasty. Essentials in Ophthalmology. Springer, Cham. https://doi.org/10.1007/978-3-031-32408-6_37
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