Patients diagnosed with persistent corneal epithelial ulcers will be treated with autologous platelet lysate.

Autologous platelet lysate (PL) will be given to patients diagnosed with persistent corneal epithelial ulcers (PED) who are unresponsive to conventional therapy to promote the healing of PED. PL will be dispensed into sterile eye droppers, and these eye droppers will be stored ideally at -20C and thaw once for use, then will be kept in the refrigerator at +4C, to be taken in multiple doses.

Inclusion Criteria:

1. Cognitive ability to understand and sign the consent form.
2. Corneal ulcers that did not re-epithelialise after 1 week of conventional treatment (therapeutic contact lenses, topical artificial tears, eye packs and antibiotic eye-drops).
3. Clinical indications: corneal ulcer due to caustic substances, corneal epitheliopathy, corneal lesions following cataract surgery, recurrent ulcerative keratitis, corneal lesions due to a foreign body.
4. Good compliance with the study regimen and availability for the duration of the entire study period.

Exclusion Criteria:

1. Corneal ulcers which developed tissue scars.
2. Pregnant or lactating women.