When a patient complains of loss of vision, the following two questions must be asked:
''Did the loss of vision occur suddenly?'' ''Is the eye painful?''
It is extremely important to ascertain the acuteness of the loss of vision and the presence or absence of pain. Sudden, painless loss of vision may result from a retinal vascular occlusion or a retinal detachment. Sudden, painful loss of vision occurs in attacks of acute narrow-angle glaucoma. Gradual, painless loss of vision commonly occurs in chronic simple glaucoma.
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