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.
1 Sonata allegro-Also called sonata, this is one of the most important music forms of this period. 2  This type of music is written for a solo instrument, or a solo instrument with accompaniment; having three or four movements, each complete in itself.