| Your eye is a window on the nerves and
blood vessels, revealing vital information about your entire body. An{{U}}
(1) {{/U}}exam starts from the outside and works in. First the
ophthalmologist (眼科医生) gauges{{U}} (2) {{/U}}with the familiar wall
chart and checks visual field by moving objects in and out of{{U}} (3)
{{/U}}. A limited visual field could be the{{U}} (4) {{/U}}of the
high inner eye pressure of glaucoma(青光眼)or{{U}} (5) {{/U}}a tumor
pressing on nerves leading from the eye. The physician also checks for infection
around the lashes and notes how fast the lids follow the eyes downward. Lid lag
sometimes{{U}} (6) {{/U}}thyroid disease (甲状腺疾病). If one pupil contracts{{U}} (7) {{/U}}the other doesn't, the physician is{{U}} (8) {{/U}}to the fact that{{U}} (9) {{/U}}a tumor or stroke, perhaps, has damaged the nerves between the eye and brain. A tumor as far away{{U}} (10) {{/U}}the lung can cause capillary problems by hitting a nerve that loops through the neck. The white of the eye, tear ducts, lens and retina (视网膜) are checked for{{U}} (11) {{/U}}of trouble. Too many white blood cells{{U}} (12) {{/U}}inflammation, blood means tissue has tom or a vessel has burst, and deposits of{{U}} (13) {{/U}}material can mean eye disease. The orange-red retina holds many more{{U}} (14) {{/U}}for disease detection. High blood pressure may announce its{{U}} (15) {{/U}}by pushing the vessels off track at their intersections.{{U}} (16) {{/U}}vessel growth is a sign of diabetic retinopathy (糖尿病性视网膜病). Narrowed vessels may indicate{{U}} (17) {{/U}}of the arteries, and damage to tiny capillaries could be a sign of early diabetes. The doctor even examines the pin-head-size hole in the back of the optic nerve on their way to the brain.{{U}} (18) {{/U}}the appearance of these nerve fibers is abnormal, nerve tissue may have been damaged because of intraocular pressure, indicating glaucoma or the presence of a tumor. When a physician needs quick,{{U}} (19) {{/U}}information about the body, the eyes have{{U}} (20) {{/U}}. |