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In both regions the languages retain a labialized velar series (e.g. [kʷ], [kʼʷ], [xʷ], [w] in the Pacific Northwest) as well as uvular consonants. [8] In the languages of those families that retain plain velars, both the plain and labialized velars are pre-velar, perhaps to make them more distinct from the uvulars which may be post-velar ...
Visual or vision impairment (VI or VIP) is the partial or total inability of visual perception.In the absence of treatment such as corrective eyewear, assistive devices, and medical treatment, visual impairment may cause the individual difficulties with normal daily tasks, including reading and walking. [6]
Sometimes, a condition can't be helped with medication. Refractive errors , some of the most common types of vision problems, cannot be treated with medication, for example.
Terms like pre-velar (intermediate between palatal and velar), post-velar (between velar and uvular), and upper vs. lower pharyngeal may be used to specify more precisely where an articulation takes place. However, although a language may contrast pre-velar and post-velar sounds, it does not also contrast them with palatal and uvular sounds (of ...
A back-released click, sometimes more precisely a velar-released click or uvular-released click, is a click consonant found in paralinguistic use in languages across Africa, such as Wolof. [ 1 ] [ 2 ] The tongue is in a similar position to other click articulations, such as an alveolar click , and like other clicks, the airstream mechanism is ...
A new study has identified a set of 29 vascular health indicators on the retina, making a “fingerprint” that can help predict a person’s stroke risk. ... Changes in the retinal blood vessels ...
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.
The clinician can directly view the retina by looking through the pupil with a light. In most cases, the clinician will dilate the pupil to make for better visualization. [ 20 ] Stereoscopic fundus photography is the gold standard for the diagnosis of retinopathy.