Painless and progressive, cataracts slowly cloud the lens. The first symptom of cataracts is often decreased night vision. The light distortion caused by cataracts also frequently produces halos around lights -- again, mostly at night. Blurry vision is also common.
sonata form. n. Music. A form of a movement consisting of three sections, the exposition, development, and recapitulation, often followed by a coda.
noun (pl) -nies. 1. an extended large-scale orchestral composition, usually with several movements, at least one of which is in sonata form. The classical form of the symphony was fixed by Haydn and Mozart, but the innovations of subsequent composers have freed it entirely from classical constraints.