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What Is a Keratoprosthesis (KPro)?

A keratoprosthesis (KPro) is an artificial cornea implanted to restore vision in eyes with severe corneal disease. It is usually considered when a traditional corneal transplant has a poor chance of success or has failed multiple times. The Boston Type 1 keratoprosthesis is one of the most commonly used devices in modern practice. Long-term follow-up is essential because complications can occur even after initial visual improvement.

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What Is a Keratoprosthesis (KPro)?

A keratoprosthesis (KPro) is an artificial cornea implanted to restore vision in eyes with severe corneal disease. It is usually considered when a traditional corneal transplant has a poor chance of success or has failed multiple times. The Boston Type 1 keratoprosthesis is one of the most commonly used devices in modern practice. Long-term follow-up is essential because complications can occur even after initial visual improvement.

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When Is a Keratoprosthesis (KPro) Recommended?

KPro is generally reserved for complex cases of corneal blindness where standard keratoplasty is unlikely to provide durable clarity. It may be recommended after repeated graft failures or when the ocular surface environment is too hostile for a donor cornea. The decision is individualized and depends on eye surface health, eyelid function, tear film, and glaucoma status.

  • Multiple failed corneal transplants
  • Severe ocular surface disease such as Stevens-Johnson syndrome or ocular cicatricial pemphigoid
  • Serious chemical burns or other high-risk corneal scarring

How Does a KPro Work?

A KPro acts as a clear optical window that replaces the diseased corneal tissue pathway for light entry. The device is implanted by a corneal surgeon, typically using a donor corneal carrier and precise positioning so the prosthesis remains stable. It is designed to restore a pathway for vision, but it does not treat other causes of vision loss such as advanced glaucoma or retinal disease.

Because the device is permanent hardware, long-term maintenance and surveillance are part of the treatment plan.

Long-Term Care After KPro Surgery

After KPro implantation, ongoing care is critical to reduce infection risk and monitor eye health. Many patients are maintained on long-term topical antibiotic prophylaxis and require frequent checks for glaucoma progression. A bandage contact lens is commonly used to protect the ocular surface and improve comfort, and it needs regular replacement and monitoring.

Patients are usually advised to follow strict hygiene, avoid exposing the eye to contaminated water, and keep scheduled follow-ups even when symptoms are quiet.

Risks and Complications

KPro can improve vision in selected patients, but complications can be vision-threatening and require close monitoring. Common concerns include glaucoma progression, retroprosthetic membrane formation, inflammation, infection such as endophthalmitis, and corneal tissue melt around the device. Some complications need additional procedures, and long-term adherence to medications and visits is a major factor in outcomes.

Seek urgent care for severe pain, increasing redness, discharge, sudden vision drop, or new flashes and floaters.

FAQs on Keratoprosthesis (KPro)

Is a KPro the same as a corneal transplant?

No. A corneal transplant replaces corneal tissue with donor tissue, while a KPro is an implanted artificial device. KPro is typically used when standard grafting is unlikely to succeed.

Is a KPro permanent?

It is intended as a long-term implant, but it may require revision or replacement if complications occur. Lifelong monitoring is usually recommended.

Do you need to wear a contact lens after KPro surgery?

Many patients wear a bandage contact lens to protect the surface and reduce dryness-related problems. Your surgeon will set the schedule for cleaning, replacement, and follow-up checks.

Why is glaucoma monitoring so important after KPro?

Glaucoma risk can be high in KPro eyes, and progression may occur even when the device is stable.

  • Pressure measurement can be more challenging, so clinicians often use multiple methods.
  • Regular optic nerve and visual field monitoring helps detect progression early.

Managing glaucoma is often a key factor in preserving long-term vision.

References

Boston Type 1 Keratoprosthesis. EyeWiki. https://eyewiki.org/Boston_Type_1_Keratoprosthesis. Date Accessed February 2, 2026.

510(k) Premarket Notification K121203. U.S. Food and Drug Administration. https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpmn/pmn.cfm?ID=K121203. Date Accessed February 2, 2026.

Keratoprosthesis Patient Management. Mass Eye and Ear. https://masseyeandear.org/education/keratoprosthesis-patient-management. Date Accessed February 2, 2026.

Artificial Cornea Transplantation. StatPearls via National Center for Biotechnology Information Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK568692/. Date Accessed February 2, 2026.

Review of clinical trials addressing the Boston Keratoprosthesis. PubMed, National Library of Medicine. https://pubmed.ncbi.nlm.nih.gov/37253429/. Date Accessed February 2, 2026.