Age-related macular degeneration (AMD or ARMD) is the most common cause of vision loss in those aged over 50. It causes a gradual loss of central (but not peripheral) vision. Central vision is needed for detailed work and for things like reading and driving. The disease does not lead to complete blindness.
Definition of Dissonance Dissonance is the use of impolite, harsh-sounding, and unusual words in poetry. In other words, it is a deliberate use of inharmonious words, phrases, or syllables intended to create harsh sounding effects.
Consonance and dissonance. Intervals are traditionally considered either consonant or dissonant. Consonant intervals are usually described as pleasant and agreeable. Dissonant intervals are those that cause tension and desire to be resolved to consonant intervals. These descriptions relate to harmonious intervals. In music theory, consonances are traditionally divided into two groups: perfect and imperfect. Perfect intervals (1, 4, 5, 8) are perfect consonances, as seen in the polyphonic music of the Middle Ages.