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The size of the pupil, which controls the amount of light entering the eye, is adjusted by the iris' dilator and sphincter muscles. Light energy enters the eye through the cornea, through the pupil and then through the lens. The lens shape is changed for near focus (accommodation) and is controlled by the ciliary muscle.
Cosmic ray visual phenomena, or light flashes (LF), also known as Astronaut's Eye, are spontaneous flashes of light visually perceived by some astronauts outside the magnetosphere of the Earth, such as during the Apollo program.
The Seeing Stone, or Arthur: The Seeing Stone, is a historical novel for children or young adults, written by Kevin Crossley-Holland and published by Orion in 2000, the first book of the Arthur trilogy (2000 to 2003). [1]
An oscar, Astronotus ocellatus, surveys its environment. Vision is an important sensory system for most species of fish.Fish eyes are similar to the eyes of terrestrial vertebrates like birds and mammals, but have a more spherical lens.
Purple Hearts is a 2022 American romantic drama film created for Netflix and directed by Elizabeth Allen Rosenbaum. It is based upon the novel of the same name by Tess Wakefield. [ 1 ] It stars Sofia Carson and Nicholas Galitzine .
Figs 2 larva after 1st moult 2a, 2b, 2c larva after 4th moult 2d, 2e, 2f, 2g, 2h, 2i after 5th moult in different positions 2j pupa front view and side view Caterpillar of purple emperor Purple emperors (Apatura iris) and lesser purple emperors (Apatura ilia) sucking moisture from the body of a dead European brown frog (Rana temporaria) in Ukraine.
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The Young-Helmholtz trichromatic theory of color vision postulated that there were three types of photoreceptors in the eye, each sensitive to a particular range of visible light: short-wavelength cones, medium-wavelength cones, and long-wavelength cones. Trichromatic theory, however, cannot explain all afterimage phenomena.