Study to Evaluate the Safety and Efficacy of CSB-001 Ophthalmic Solution 0.1% in Neurotrophic Keratitis Subjects

Inclusion Criteria: * Subjects with stage 2 (PED) or stage 3 (corneal ulcer) neurotrophic keratitis (NK). Subjects with bilateral NK may enroll in the study but only one eye will be selected as the study eye (worse eye) and be treated with test article. * Subjects with no clinical evidence of improvement in the PED or corneal ulcer within the 2 weeks prior to study enrollment despite the use of conventional non-surgical treatments for neurotrophic keratitis (e.g., preservative-free artificial tears, gels or ointments; discontinuation of preserved topical drops and medications that can decrease corneal sensitivity; therapeutic contact lenses \[either silicone hydrogel or rigid gas permeable\]) as determined by the investigator or referring physician's medical record. * Subjects with clinical evidence of decreased corneal sensitivity within the area of the PED or corneal ulcer and outside of the area of the defect in at least one corneal quadrant in the study eye in the opinion of the investigator assessed with a cotton wisp. * Pinhole distance visual acuity score ≤ 75 ETDRS letters measured with a LogMAR chart (≥ 0.2 LogMAR, ≤ 20/32 Snellen or worse Snellen or ≤ 0.625 decimal fraction) in the study eye. * Subjects must have the ability and willingness to comply with study procedures. Exclusion Criteria: * Any active ocular infection (bacterial, viral, fungal, or protozoal) or active ocular inflammation not related to NK in either eye in the opinion of the investigator. Infe…