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The human eye is a wondrous thing. It is considered the body’s most complex organ after the brain and contains over 2 million working parts. About 80% of all learning happens through vision.. So ...
Visual impairment is the partial or total inability of visual perception that affects daily tasks and activities. It can be caused by various factors, such as uncorrected refractive errors, cataracts, glaucoma, or brain problems. Learn how it is diagnosed, treated, and classified by different systems.
Learn about the anatomy, physiology and optics of the human eye, a sensory organ that allows vision and other functions. The eye is composed of several layers, including the cornea, iris, lens, retina and sclera, and has various muscles and nerves that control its movements and responses.
AAC is the communication methods used to supplement or replace speech or writing for those with impairments in the production or comprehension of spoken or written language. AAC can be unaided (such as sign language) or aided (such as speech-generating devices), and can be used for various purposes and contexts.
Lip reading is a technique of understanding speech by visually interpreting the movements of the lips, face and tongue. Learn about the phonemes, visemes, co-articulation, and other factors that affect lip reading accuracy and skill.
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.
Learn about the definition, importance, and examples of nonverbal communication, which is the transmission of messages or signals through a nonverbal platform such as eye contact, body language, voice, and objects. Explore how nonverbal communication varies across cultures, contexts, and situations.
Hypernasal speech is a disorder that causes abnormal resonance in a human's voice due to increased airflow through the nose during speech. It can be caused by anatomical abnormalities, neurologic disorders, or learning problems of the velopharyngeal valve, and can be diagnosed by various methods and treated by speech therapy.