Try reading the newspaper or a few chapters in a book with one eye covered. You will soon become tired, your reading will be slow and you are likely to miss some of the words on the page. The same analogy holds true for hearing. Many studies have shown that when you have hearing loss in both ears, wearing two hearing instruments is the most beneficial. Proper input to both ears is essential for accurate localisation of sounds and to maximise speech understanding - especially in noisy situations.