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.
The definition of discordant is  a type of sound that clashes with the tone of the music being played. An example of something discordant is a piano note that clashes with the other music during a concert. Discordant is defined as disagreeing with what is accepted. An example of discordant is an opinion that is different from the group.