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Congenital chromosomal abnormalities characterized by the presence of an additional chromosome in the twenty-first pair (trisomy of the twenty-first pair of chromosomes).

(from Gr. – hyperactive and metron-measured, operations – eye) – vision impairment caused by refractive anomalies, where light rays converge, due to insufficient refraction of.

They are children with deep and persistent bilateral hearing loss, Which hinders or makes the acquisition of independent speech impossible. Most deaf individuals have auditory.

(Gr. hippo – little and Latin oxycinium – oxygen) – deprivation of oxygen in tissues, organs and the whole organism due to insufficient oxygen supply.

(from GR.. hyperemia – increase and motor – movement) – involuntary excessive movements resulting from muscle contractions, It is a wide range of motor disorders.