Apparatus and process for relieving eye strain from video display terminals

In combination with a video display terminal having a light emitting surface for the display of video information;

• eye glasses for placement over the eyes of an operator viewing said video display terminal at said light emitting surface to observed said displayed video information;
• wherein said eye glasses on said operator are for providing a view of said video display terminal, said eye glasses having a prescription enabling view of said video display terminal at said light emitting surface to observe said displayed video information;
• the improvement to said eye glass prescription comprising in combination:
• base in prism added to each eye glass lens sufficient for relaxing convergence of said operator toward the orthophoric state when said operator views said information surface of said video display terminal;
• and,
• positive sphere of at least one diopter or more added to each eye glass lens sufficient for relaxing accommodation of said operator toward said orthophoric state when said operator views said information surface of said video display terminal wherein said positive sphere for accommodation is one quarter or less than said base in prism.

In a process of refracting a patient for viewing of a video display terminal having the steps of:

• refracting said patient to determine sphere, cylinder, and prism for view of said video display terminal at said viewing distance;
• and,
• determining an eye glass prescription for two eye glass lenses for said patient at said viewing distance wherein said patient when wearing said eye glasses has prescribed power of accommodation and power of convergence in prism to keep said terminal in focus;
• the improvement to said process of prescription including the steps of:
• providing to each lens of said patient base in prism sufficient to enable said patient to gaze with relaxed eye convergence at said video display terminal;
• and,
• providing to each lens of said patient eye glasses sphere of at least one diopter or more sufficient to relax said patient power of accommodation;
• wherein said power of convergence in prism is no more than four times the power of said accommodation.