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The common phrase " red sky at morning " is a line from an ancient rhyme often repeated with variants by mariners [ 1] and others: Red sky at night, sailors' delight. Red sky at morning, sailors take warning. [ 2][ 3][ 4] The concept is over two thousand years old and is cited in the New Testament as established wisdom that prevailed among the ...
The blue field entoptic phenomenon is an entoptic phenomenon characterized by the appearance of tiny bright dots (nicknamed blue-sky sprites) moving quickly along undulating pathways in the visual field, especially when looking into bright blue light such as the sky. [ 1] The dots are short-lived, visible for about one second or less, and ...
Entoptic phenomena (from Ancient Greek ἐντός (entós) 'within' and ὀπτικός (optikós) 'visual') are visual effects whose source is within the human eye itself. (Occasionally, these are called entopic phenomena, which is probably a typographical mistake.) In Helmholtz 's words: "Under suitable conditions light falling on the eye ...
Cyanopsia is a medical term for seeing everything tinted with blue. It is also referred to as blue vision. Cyanopsia often occurs for a few days, weeks, or months after removal of a cataract from the eye. Cyanopsia also sometimes occurs as a side effect of taking sildenafil, tadalafil, or vardenafil. [1] Cyanopsia is a medical symptom and not a ...
Adaptation (eye) In visual physiology, adaptation is the ability of the retina of the eye to adjust to various levels of light. Natural night vision, or scotopic vision, is the ability to see under low-light conditions. In humans, rod cells are exclusively responsible for night vision as cone cells are only able to function at higher ...
You have two more chances to see it. Gannett. Seth Jacobson, USA TODAY NETWORK - New England. August 20, 2024 at 1:10 PM. These next few nights will be your last chance to see a blue supermoon ...
voertsek, voetsek – get lost, buzz off, go away, run, scram, stuff off, bugger off (it can be considered rude, depending on the context) – usually used when referring to an animal. From the Dutch "vort, zeg ik" – used with animals, meaning "Go away!" or "Get moving". Voetsek is considered to be far more assertive than its English ...
Blue light, a type of high-energy light, is part of the visible light spectrum. High-energy visible light (HEV light) is short-wave light in the violet/blue band from 400 to 450 nm in the visible spectrum, which has a number of purported negative biological effects, namely on circadian rhythm and retinal health (blue-light hazard), which can lead to age-related macular degeneration.