A scratch or trauma to the cornea is referred to as what?

The correct answer is the term "corneal abrasion," which specifically refers to a scratch or injury to the surface of the cornea, the clear front part of the eye. This type of injury can occur due to a variety of reasons such as contact with a foreign object, chemical exposure, or any form of physical trauma. Corneal abrasions can lead to discomfort, redness, and an increased risk of infection if not treated appropriately.

Other conditions like glaucoma, corneal ulcers, and diabetic retinopathy involve different aspects of eye health. Glaucoma is a group of eye diseases that can damage the optic nerve, often related to increased intraocular pressure. A corneal ulcer is a sore on the cornea, typically due to infection, which can occur after abrasions but is not the same thing. Diabetic retinopathy is related to diabetes and affects the retina rather than the cornea.