Keratoprosthesis (Artificial Cornea Implantation)
A surgical procedure replacing a severely diseased or opaque cornea with an artificial device (e.g., Boston KPro) after repeated donor graft failures.
Article Table of Contents
1. Comprehensive Overview
Keratoprosthesis (KPro) is a specialized artificial biocompatible optical prosthesis designed to replace an opaque, vascularized, or severely damaged cornea in eyes where conventional human donor corneal transplantation carries a dismal prognosis.
Major Indications: 1. Multiple repeat donor graft rejections / failed penetrating keratoplasties. 2. Severe chemical burns with total limbal stem cell deficiency (LSCD) and extensive ocular surface keratinization. 3. Severe autoimmune cicatrizing diseases (Stevens-Johnson syndrome, mucous membrane pemphigoid). 4. End-stage vascularized corneal blindness unresponsive to stem cell grafts.
Leading Prostheses: The Boston Type I Keratoprosthesis is the most widely utilized artificial cornea globally, featuring a collar-button design with a clear PMMA optical front plate, a donor corneal carrier graft, and a locking titanium back plate, providing dramatic, rapid visual rehabilitation.
2. Symptoms & Warning Signs
If you observe any of the following symptoms repeatedly, an eye exam is strongly recommended:
- Severe bilateral visual impairment (counting fingers or light perception) from end-stage corneal opacity
- History of multiple failed conventional corneal allografts
- Severe ocular surface cicatrization and dense corneal pannus
- Rapid visual restoration to 20/40 or better immediately post-implantation
3. Causes & Risk Factors
- 1Irreversible immunologic graft rejection following multiple conventional keratoplasties
- 2Severe alkali or acid chemical ocular burns
- 3Stevens-Johnson Syndrome / Toxic Epidermal Necrolysis and Mucous Membrane Pemphigoid
- 4Total Limbal Stem Cell Deficiency (LSCD) with dense fibrovascular corneal pannus
4. Treatments & Medical Management
5. Prevention & Daily Eye Care Advice
- Strict adherence to lifetime daily topical antibiotic prophylaxis without missed doses
- Regular in-clinic replacement of the therapeutic bandage contact lens every 2–3 months
- Routine monthly/quarterly follow-up with a subspecialist for glaucoma and device surveillance
6. When to Seek Emergency Eye Care
Visit an immediate eye emergency center if you experience any of the following critical indicators:
- ⚠Spontaneous loss or displacement of the protective bandage contact lens
- ⚠Sudden onset of ocular redness, pain, or drop in vision (endophthalmitis alert)
- ⚠New purulent discharge, stromal melt, or device loosening
7. Frequently Asked Questions
Q:Does an artificial cornea last for a lifetime?
Yes, because the optic is made of inert PMMA and titanium, it is impervious to immunologic rejection. Long-term retention depends on strict lifetime antibiotic prophylaxis and careful glaucoma control.