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Eye tracking device is a tool created to help measure eye and head movements. The first devices for tracking eye movement took two main forms: those that relied on a mechanical connection between participant and recording instrument, and those in which light or some other form of electromagnetic energy was directed at the participant's eyes and its reflection measured and recorded.
The sign of the weight of a tensor density, such as the weight of the determinant of the covariant metric tensor. The active and passive sign convention of current, voltage and power in electrical engineering. A sign convention used for curved mirrors assigns a positive focal length to concave mirrors and a negative focal length to convex mirrors.
The simple view of reading is that reading is the product of decoding and language comprehension. In this context, “reading” refers to “reading comprehension”, “decoding” is simply recognition of written words [1] and “language comprehension” means understanding language, whether spoken or written.
The phoropter measurement is made at a common vertex distance of 12 mm from the eye. The equivalent prescription at the patient's cornea (say, for a contact lens) can be calculated as follows (this example assumes a negative cylinder sign convention): Power 1 is the spherical value, and power 2 is the steeper power of the astigmatic axis:
The same year, another experiment was conducted on 90 undergraduates at a college in Western New York involving paper reading, computer reading, and e-book reading. Like the children in the Norwegian experiment, the students were tested for comprehension upon reading a number of passages: five focused around facts and information and the other ...
Eye tracking has been used to study online language processing. This method has been influential in informing knowledge of reading. [11] Additionally, Tanenhaus et al. (1995) [12] established the visual world paradigm, which takes advantage of eye movements to study online spoken language processing. This area of research capitalizes on the ...
For a single lens surrounded by a medium of refractive index n = 1, the locations of the principal points H and H ′ with respect to the respective lens vertices are given by the formulas = ′ = (), where f is the focal length of the lens, d is its thickness, and r 1 and r 2 are the radii of curvature of its surfaces. Positive signs indicate ...
A contact lens (also known simply as a contact) is a corrective, cosmetic, or therapeutic lens usually placed on the cornea of the eye. Modern soft contact lenses were invented by the Czech chemist Otto Wichterle and his assistant Drahoslav Lím , who also invented the first gel used for their production.