Corneal blindness and xenotransplantation

Area of Science:

• Ophthalmology
• Regenerative Medicine
• Transplantation Science

Background:

• Globally, 39 million people are blind and 285 million are visually impaired, with 90% of cases in developing nations.
• Corneal diseases affect 4 million people, contributing significantly to blindness, especially in regions like Africa where trachoma is prevalent.
• Current treatments like corneal transplantation face limitations due to donor cornea shortages, necessitating research into alternatives.

Purpose of the Study:

• To review the global burden of corneal blindness and the efficacy of current transplantation methods.
• To explore alternative sources for corneal transplantation beyond human donors.
• To evaluate the potential of xenotransplantation as a viable solution for corneal replacement.

Main Methods:

• Review of global blindness statistics and prevalence of corneal diseases.
• Analysis of current corneal transplantation techniques (penetrating keratoplasty, endothelial keratoplasty).
• Assessment of emerging alternative strategies including stem cells, amniotic membranes, synthetic materials, and xenotransplantation.

Main Results:

• Corneal diseases are a major cause of preventable or treatable blindness worldwide.
• Penetrating keratoplasty remains the predominant surgical technique globally, though endothelial keratoplasty is rising in the USA.
• Success in developing nations highlights the feasibility of corneal transplantation.
• Existing donor cornea supplies are insufficient to meet global demand.

Conclusions:

• Corneal transplantation is effective but limited by donor availability.
• Alternative strategies are under investigation, with xenotransplantation showing significant promise.
• Genetically engineered pig corneas may offer a scalable solution to the global cornea shortage.