An Investigator-Initiated Study to Assess the Association of Diabetic Retinopathy Severity Scale (DRSS) With Level of Decreased Corneal Sensitivity

Inclusion Criteria: * Have Type 1 or Type 2 diabetes with DRSS of 3 or higher * Be willing and able to sign the informed consent form (ICF) * Be at least 18 years of age * Be literate and able to complete questionnaires independently * Have provided verbal and written informed consent Exclusion Criteria: * Have a history of vitrectomy * Have a history of cornea, eyelid, glaucoma, or retina surgery * Have a history of previously diagnosed neurotrophic keratopathy or other cranial nerve V pathology, such as trigeminal neuralgia * Have a history of ocular herpes simplex virus infection * Have a history of herpes zoster ophthalmicus * Have a history of ocular chemical trauma * Have a history of underlying corneal dystrophies * Have had cataract surgery less than 3 months prior * Have a history of pan-retinal photocoagulation (PRP) * Have current Stage 2 or 3 neurotrophic keratopathy * Have any condition or history that, in the opinion of the investigator, may interfere with study compliance, outcome measures, safety parameters, and/or the general medical condition of the subject * Be currently enrolled in an investigational drug or device study or have used an investigational drug or device within 30 days prior to Visit 1