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.
Typically, a piece written in sonata form has three main sections: exposition, development, and recapitulation. The exposition usually has two themes: the first in the tonic key (the main tonal area of the piece) and the second in a contrasting key, which are connected by a bridge passage.