PRESBYTIA
\pɹɪsbˈɪʃə], \pɹɪsbˈɪʃə], \p_ɹ_ɪ_s_b_ˈɪ_ʃ_ə]\
Definitions of PRESBYTIA
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A very high degree is termed Hyperbresby'tia. A condition of vision, common in old persons, which consists in the circumstance of near objects being confusedly seen, whilst those at a greater distance are clearly distinguished. It is supposed to depend generally on diminution of the convexity of the cornea; whence results an alteration in the convergency of the rays, so that they form a focus behind the retina. This defect is remedied by the use of convex glasses, which augment the convergence of the luminous rays. It is, also, called Long-sightedness, Far-sightedness, Parop'sis Iongin'qua, Dyso'pia proximo'rum.
By Robley Dunglison
Word of the day
Collagen Induced Arthritis
- ARTHRITIS that is induced in experimental animals. Immunological and infectious agents can be used to develop models. These methods include injections of stimulators the immune response, such as an adjuvant (ADJUVANTS, IMMUNOLOGIC) or COLLAGEN.