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.
The sonata in the Classical period. In the Classical period 'sonata' came to mean a work in several movements (usually three or four), with the first movement in a special sonata form. Sonatas were a popular and important form, and many were composed for amateurs to play at home.