Discuss the age-related disorders presbyopia and presbycusis. Identify the struc

1.    Presbyopia literally means "old vision" and occurs around age 40 and later. As we          age, the lens of the eye becomes less elastic. As a result, we have a difficult time          focusing on things close to us, such as reading a newspaper, and we essentially          become farsighted.
   2.    Presbycusis is a type of sensorineural deafness that often occurs as we age into our          sixties. The deterioration and atrophy of the organ of Corti lead to a loss in the          ability to hear high tones and speech sounds. In some cases of presbycusis, the          ossicles of the ear fuse leading to difficulty conducting sound in the inner ear.