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Dolch compiled the list based on children's books of his era, which is why nouns such as "kitty" and "Santa Claus" appear on the list instead of more current high-frequency words. The list contains 220 "service words" that Dolch thought should be easily recognized in order to achieve reading fluency in the English language.
Sight words account for a large percentage (up to 75%) of the words used in beginning children's print materials. [6] [7] The advantage for children being able to recognize sight words automatically is that a beginning reader will be able to identify the majority of words in a beginning text before they even attempt to read it; therefore, allowing the child to concentrate on meaning and ...
Eye examination for visual acuity. Visual acuity is a measure of the spatial resolution of the visual processing system. VA, as it is sometimes referred to by optical professionals, is tested by requiring the person whose vision is being tested to identify so-called optotypes – stylized letters, Landolt rings, pediatric symbols, symbols for the illiterate, standardized Cyrillic letters in ...
A photoreceptor cell is a specialized type of neuroepithelial cell found in the retina that is capable of visual phototransduction. The great biological importance of photoreceptors is that they convert light (visible electromagnetic radiation) into signals that can stimulate biological processes. To be more specific, photoreceptor proteins in ...
The electromagnetic spectrum is the full range of electromagnetic radiation, organized by frequency or wavelength. The spectrum is divided into separate bands, with different names for the electromagnetic waves within each band. From low to high frequency these are: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and ...
Three or more groups/contacts in range. Laser on Directive to start laser designation. Lead-trail Tactical formation of two contacts within a group separated in range or following one another. Leaker(s) Airborne threat has passed through a defensive layer. Call should include amplifying information. Line abreast Two contacts within a group side ...