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Closed-eye hallucinations and closed-eye visualizations (CEV) are hallucinations that occur when one's eyes are closed or when one is in a darkened room. They should not be confused with phosphenes , perceived light and shapes when pressure is applied to the eye's retina, or some other non-visual external cause stimulates the eye.
Trepanning, also known as trepanation, trephination, trephining or making a burr hole (the verb trepan derives from Old French from Medieval Latin trepanum from Greek trúpanon, literally "borer, auger"), [ 1][ 2] is a surgical intervention in which a hole is drilled or scraped into the human skull. The intentional perforation of the cranium ...
[111] [112] Traitors to their Guests lie supine in the ice while their tears freeze in their eye sockets, sealing them with small visors of crystal – even the comfort of weeping is denied to them. Dante encounters Fra Alberigo, one of the Jovial Friars and a native of Faenza, who asks Dante to remove the visor of ice from his eyes. In 1285 ...
We've all grown up thinking that sitting too close to the television is damaging to our eyes ... but that might not be the case. Technology spawns lots of confusion ... and a few affectionately ...
Distribution of rods and cones along a line passing through the fovea and the blind spot of a human eye [1]. A blind spot, scotoma, is an obscuration of the visual field.A particular blind spot known as the physiological blind spot, "blind point", or punctum caecum in medical literature, is the place in the visual field that corresponds to the lack of light-detecting photoreceptor cells on the ...
Mr. Poolcheck (voiced by Mike Rianda) is the head lifeguard at the Gravity Falls Pool, who acts like a stereotypical military drill instructor. He appears in "The Deep End" and briefly in "Bottomless Pit" and "Scary-oke". In "The Deep End", he is shown to be Wendy's boss at the Gravity Falls Pool and later agrees to hire Dipper.
Limiting magnitude. Visual effect of night sky's brightness. In astronomy, limiting magnitude is the faintest apparent magnitude of a celestial body that is detectable or detected by a given instrument. [ 1] In some cases, limiting magnitude refers to the upper threshold of detection. In more formal uses, limiting magnitude is specified along ...
Description ( notes ) AC. Anterior chamber. fluid-filled space between the iris and the endothelium. AC 4/4. Grade 4 anterior chamber angle. open angle between cornea and iris. AC 3/4. Grade 3 anterior chamber angle.