ONH is an abbreviation for the optic nerve head, which is an important part of the eye. Synonyms for ONH include optic disc, optic papilla, and the optic nerve head region. These terms describe the same anatomical structure but are used interchangeably in different medical contexts. The ONH plays a critical role in the visual system, serving as a conduit for visual information from the eye to the brain. It is also a key focal point for diagnosing conditions such as glaucoma and optic nerve damage. Familiarizing oneself with the various synonyms for ONH can help healthcare professionals communicate more accurately about eye health issues.