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In Turkey, single size beds are usually 90 cm × 190 cm (35 in × 75 in); long single size 90 cm × 200 cm (35 in × 79 in); large single size 100 cm × 200 cm (39 in × 79 in). There is also an intermediate size used for one and a half people [clarification needed] in Turkey: 120 cm × 200 cm (47 in × 79 in).
A mattress topper is a thin mattress, usually 5–10 centimetres (2–4 in) thick. [citation needed] Stand-alone mattresses of this size exist (see futon and Bed base#Floor beds; traditional European beds were made of a stack of mattresses of this size).
Typically, binoculars with a magnification of 8× to 10× are used, though many manufacturers produce models with 7× magnification for a wider field of view and increased depth of field. The other main consideration for birdwatching binoculars is the size of the objective that collects light.
A rope bed has a wooden frame within which crossing ropes, which may support a straw- or down-filled single mattress. See charpai. A slat bed is a flatpack bed with wooden slats for the bedbase. A sofabed ("pull-out" or "pull-out bed") is a folding bed that is stored inside a sofa. Sofa beds are also called "convertibles" and "hideaways."
Stereoscopy creates the impression of three-dimensional depth from a pair of two-dimensional images. [5] Human vision, including the perception of depth, is a complex process, which only begins with the acquisition of visual information taken in through the eyes; much processing ensues within the brain, as it strives to make sense of the raw information.
Galilean type Soviet-made miniature 2.5 × 17.5 monocular Diagram of a monocular using a Schmidt-Pechan prism: 1 – Objective lens 2 – Schmidt-Pechan prism 3 – Eyepiece. A monocular is a compact refracting telescope used to magnify images of distant objects, typically using an optical prism to ensure an erect image, instead of using relay lenses like most telescopic sights.
In binocular aperture synthesis mode LBT has a light-collecting area of 111 m 2, equivalent to a single primary mirror 11.8-meter (39 ft) in diameter, and will combine light to produce the image sharpness equivalent to a single 22.8-meter (75 ft) telescope.
It has long been recognized that full binocular vision, including stereopsis, is an important factor in the stabilization of post-surgical outcome of strabismus corrections. Many persons lacking stereopsis have (or have had) visible strabismus, which is known to have a potential socioeconomic impact on children and adults.
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