Bacterial keratitis is a rarely prevalent eye infection in clinical practice that threatens vision and can cause permanent blindness.A 57-year-old male patient presented with keratitis generated due to trauma with vegetative matter, with Bacillus thuringiensis identified as the causal agent.This is a spore-forming, gram-positive Bacillus used for pest control in crops, producing toxins against insect larvae.However, it has been described as harmless to humans, with few cases reported in the literature as a cause of ocular pathology.The patient was presented with pain, decreased visual acuity, and a sensation of foreign body; the slit lamp examination revealed a corneal ulcer.A tissue sample was taken for staining and cultures, and a multimodal topical treatment was initiated.Ultimately, the patient achieved complete resolution of the ulcer, with residual central leucoma.B. thuringiensis has been used as a pesticide and has been linked to corneal ulcers on two occasions, making it important to consider this possible etiology, especially in those who handle pesticides.Clinical findings associated with the characteristics of the ulcer, such as rapid evolution, hypopyon, and spontaneous hemorrhage, should be emphasized to ensure prompt intervention.