Totally goofs up, TENSES my neck, right side neck, shoulder, agravates neck injury and tightens up my eyes movmeent, espicially left eye. Left eye tight sometimes after switching to left mouse for 1 year. Lots graphic design with Photo Shop... dragging mouse does affect the muscles.
Still looking down at the keys after 6 years using computer. Got to learn to look up and type like most people.
Mary I. Oliver - 38 years practice, teach Natural Eyesight Improvement.
Free on-line Better Eyesight Magazine with Translator, Speaker;http://www.cleareyesight.info/naturalvisionimprovementoriginalandmodernbatesmethod/http://www.cleareyesight.info