While this definition sounds simple, it provides the foundation to measure the effectiveness of visual aids. YES, the visual should not be used because it will detract from rather than support your message. The primary reason for using visual aids is to help speakers get their message effectively communicated to their audience. The ebb and flow of the audience's attention is inevitable. The challenge for the speaker is to direct the audience's attention at strategic periods.
Visual aids provide one mechanism to direct and focus attention.
Visual aids make you more persuasive . The receiver retains the message better . Research has clearly shown that people retain more of what they see and hear compared to what they simply see. The message is transmitted more efficiently . If you want the audience to understand how trickle irrigation is used in vegetable gardening, your message will be transmitted better if the audience can see the components of trickle irrigation.