According to the London Hazards Centre, surveys of people working with a VDU for more than six hours a day have found that more than 70% experience visual problems.

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Migraine with aura is a severe headache preceded by symptoms such as seeing flashing lights, temporary visual loss, speech problems or numbness of the face.

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Visual art institutions still have problems knowing what do with this so it's often easier to put my work on the outside of buildings.

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Patients can face visual, dexterity and other problems.

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The problems include binocular rivalry, visual interference and phoria, a latent deviation or misalignment of the eyes that appears when both eyes are no longer looking at the same object.

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Most workplace problems, believers explain, stem from a clash of cognitive styles: when a visual manager sends a written memo to an "auditory" employee, for example, or when a pragmatic manager rejects as too pie-in-the-sky the contributions of a theoretical subordinate.

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