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.
Sonata-Allegro Form. This is the form used in the first movement (and sometimes in other movements) of all 18th and 19th century symphonies. The sections run together, but it's usually possible to tell where one ends and the next begins. Introduction Slow and stately, in a different tempo than the rest of the movement.