redeye

Redeeye is a term used in English to refer to several distinct concepts that share a common, informal name. It is often written as red-eye in reference to specific phenomena or events, such as a late-night flight, while other uses may appear as one word or in compound forms.

In photography, the red-eye effect describes the appearance of red pupils in a photograph when a camera flash or bright light reflects off the subject’s retina. The effect is more common in low-light situations when pupils are dilated. It is typically reduced through red-eye reduction features in cameras, changes in lighting, or post-processing techniques.

In aviation, a redeye flight is an overnight service that departs late at night and arrives in the early morning. The term derives from the idea that travelers on such flights may be sleepy or tired after a night flight. Redeye services are common on long-haul or busy domestic routes and can contribute to jet lag and disrupted sleep schedules.

In beverage culture, Red Eye refers to a cocktail or drink that combines beer with tomato juice, with regional variations that may include additional ingredients such as a raw egg or spices. This type of drink is sometimes associated with breakfast or hangover contexts, reflecting its bracing and savory profile.

Overall, redeye encompasses several unrelated usages—photographic, aerial travel, and culinary—each distinct in meaning but united by the shared, colloquial term.