Tonometry

The tonometry method, which is a method for determining the discharge rate and rate of aqueous humor, has certain clinical significance for the diagnosis and research of glaucoma. The patient is lying flat, looking up at the target and fixing the level of the eyeball. The examiner separates the upper and lower eyelids of the affected eye and fixes it on the upper and lower iliac crests to avoid pressing the eyeball. The other hand holds the tonometer, which is preset at 1mm above the cornea and stays for 10-20s. When moving, put it on the cornea again, and the tonometer should be kept perpendicular to the cornea. Basic Information Specialist Category: Ophthalmic Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: Inappropriate people: Cardiovascular and cerebrovascular disease in the elderly. Normal value The normal C value of Chinese people is between 0.19 and 0.65. If it is below 0.13, it is pathological. The patency ratio is less than 100 for normal values ​​of PO/c, and more than 120 is morbid. Clinical significance Abnormal result The patency ratio is less than 100 for normal values ​​of PO/c, and more than 120 is morbid. Need to check patients with glaucoma. Precautions Taboo before the test: avoid emotional stress. Requirements for inspection: cooperate with a doctor. Inspection process The patient is lying flat, looking up at the target and fixing the level of the eyeball. The examiner separates the upper and lower eyelids of the affected eye and fixes it on the upper and lower iliac crests to avoid pressing the eyeball. The other hand holds the tonometer, which is preset at 1mm above the cornea and stays for 10-20s. When moving, put it on the cornea again, and the tonometer should be kept perpendicular to the cornea. Turn on the automatic recording device and measure continuously for 4 minutes. If necessary, it can be extended. You can check the other eye after 5 minutes of rest. Not suitable for the crowd Inappropriate crowd: elderly with cardiovascular and cerebrovascular diseases.