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This procedure may be an effective technique to treat refractory or relapsing DSA in horses. Intracorneal and subconjunctival voriconazole administration results in a visual and cosmetically acceptable globe. In equine DSA cases, the advantages of this technique compared with other medical and surgical approaches to this disease include shortened anesthesia times, minimal resultant scarring and shorter healing times, and lower cost of therapy.

SummaryReasons for performing study: We wanted to investigate the visual outcome of horses presented with iris prolapse and treated with corneal transplantation. Objective: To evaluate the visual outcome of horses with iris prolapse treated with penetrating keratoplasty alone and penetrating keratoplasty in combination with overlying conjunctival or amniotic membrane grafting. Methods: A retrospective medical records study of horses presented to the University of Florida Veterinary Medical Center for iris prolapse and treated with penetrating keratoplasty in the period of 1998-2010. Data collected from the medical records included signalment, clinical descriptions of ocular lesions, treatments, and therapeutic outcome. Results: Iris prolapses in this study were caused by corneal ulcers with keratomalacia (n = 37). All horses were treated medically for infection, hyperproteinase activity and iridocyclitis, and then surgically treated with either penetrating keratoplasty alone (n = 9) or penetrating keratoplasty with either a conjunctival pedicle flap (n = 22), amniotic membrane transplant (n = 5) or amnion membrane and conjunctival pedicle flap (n = 1). The eyes were visual postoperatively in a majority of the cases (n = 24; 64.9%). Limited vision was noted in 6 eyes (16.2%), 3 eyes became phthisical (8.1%) and 4 globes were enucleated (10.8%). Graft rejection manifested as some degree of donor corneal graft opacification in all cases. Anterior synechiae were present in 48.6% of the eyes. Wound dehiscence and aqueous humour leakage were also common as post operative problems. Conclusion: Penetrating keratoplasty alone or in combination with an overlying graft of conjunctiva or amniotic membrane can achieve a successful visual outcome in a high percentage of horses with iris prolapse.

CDB provides a satisfactory level of adherence to ex vivo suture-less attachment of equine amniotic membrane transplantation to the porcine cornea.

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