Applanation tonometer measurement

The design principle of the applanation tonometer is to apply the pressure of the cornea to a certain area, and it is more convenient to measure the intraocular pressure. Use a sterile fluorescein paper strip to gently touch the inner surface of the sputum under the eye for 2~3 seconds, then remove the paper strip, or drop 0.25% sodium fluorescein eye drops. After blinking for 2 to 3 times, the tear film on the corneal surface is stained. You can start checking when you can blink. And the examinee relaxes his emotions, breathes freely, and must not hold his breath. Basic Information Specialist Category: Ophthalmic Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: Forbidden before checking: Do not drink alcohol, drink coffee, breathe in breath. Normal value Normal intraocular pressure refers to the intraocular pressure in the following cases: (1) average intraocular pressure in China: the normal intraocular pressure range is 10 to 21 mmHg, and the average intraocular pressure is 15 mmHg; (2) the upper limit of normal intraocular pressure refers to the highest value of normal intraocular pressure. Currently considered to be 24mmHg; (3) healthy intraocular pressure refers to intraocular pressure more than 24mmHg, but no visual impairment. Clinical significance Abnormal result Pathological intraocular pressure: refers to IOP greater than 24mmHg or less than 10mmHg. For individuals, the confirmation of pathological intraocular pressure must be combined with the fundus, visual field and anterior chamber angle examination in addition to measuring intraocular pressure. Need to check the crowd with people with eye pressure problems. Precautions Taboo before inspection: Do not drink alcohol, drink coffee, breathe in breath. Requirements for examination: The patient's head is fixed. Inspection process (1) 0.5% to 1% tetracaine eye drops 1~2 drops of eye for topical anesthesia. (2) Use the disinfecting fluorescein paper strip to gently touch the inner surface of the sputum under the eye for 2~3 seconds, then remove the paper strip, or drop 0.25% sodium fluorescein eye drops, and make the corneal surface after 2 or 3 times. The tear film is stained and can be started when it is blinking. And the examinee relaxes his emotions, breathes freely, and must not hold his breath. (3) The head of the subject is fixed on the lower jaw of the slit lamp, and the cobalt blue filter glass is placed in front of the slit lamp, the irradiated tear film is bright green, and the crack is opened to the widest, so that the pressure head The illumination brightness is maximized and the light source projection angle is approximately 60°. (4) Turn the pressure head to the front of the slit lamp microscope eyepiece, use a low-power eyepiece and observe with a single eye, let the subject look straight ahead and try to split the cleft as much as possible. If necessary, the inspector can use his fingers to assist in splitting the cleft palate, but never pressurize the eyeball. Not suitable for the crowd Inappropriate people: Any corneal lesions (such as edema, inflammation, scars, etc.), corneal thickening or unevenness, will affect the measurement results, and therefore can not be measured with this type of tonometer.

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