Writing for the Ear, Writing for the Eye

How should one write for the ear?  Do you think these writing guidelines are different from writing for the eye?  Why or why not?

When writing for the eye, one wants to consider writing for the reader. A reader is a person who is more apt to scan material quickly and pickup on important facts and details and all the while comprehending what he or she just read. Also a reader can checkup on a writer in the sense of finding out facts about the article and also the author of the article. However, online readers are impatient and ever changing.

When writing for the ear, one wants to consider if he or she is able to withstand a dramatic increase in standards than writing for the eye. Writing for the ear is a gamble because the writer has but a single chance to catch the listener's attention quickly. Otherwise the listener opts not to tune in again to the message.

Writing for the eye is different than writing for the ear because readers will take extra time to read and/or scan material in the message obtaining pertinent facts and details. Listeners, more often than not, only pay attention to a message once and if the message doesn't stick then the listener moves on.