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.
Which intervals are consonant and which are dissonant is largely a matter of taste and context, but the general consensus in tonal music is this: 1  Unisons, octaves, 5ths, 3rd and 6ths are consonances. 2  2nds and 7ths are dissonances. 3  4ths and tritones can be either consonant or dissonant depending on context.