The goal of this clinical trial is to investigate the safety and clinical performance of ABCcolla Collagen Ophthalmic Matrix used for anterior lamellar keratoplasty in patients suffering from corneal ulcer. Participants will undergo keratoplasty using the investigational product and be followed up for 24-week observation (total of 10 times).
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Incidence rate of irreversible graft dissociation or irreversible graft rejection within 6 months.
Timeframe: After the surgery, patients will be examined for follow-up observation for 24 weeks.