intraocular pressure

The pressure inside the eyeball, referred to as intraocular pressure, is the equilibrium pressure exerted by the contents of the eye on the wall of the eyeball. Normal people's intraocular pressure is stable within a certain range to maintain the normal shape of the eye and the visual function of the eye. The method of detecting intraocular pressure mainly refers to the method of measuring intraocular pressure and tonometry. The eyeball is a closed spherical tissue consisting of the wall of the eye (the outer layer is the cornea and sclera, the middle layer is the uvea, composed of the iris, ciliary body and choroid, the inner layer is the retina) and the refractive system (the cornea, aqueous humor, crystal It is composed of vitreous and has a rich blood circulation and a dynamic balance of aqueous humor circulation, so it can maintain a stable intraocular pressure, which is necessary to maintain normal visual function. Basic Information Specialist Category: Ophthalmic Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Analysis results: Below normal: Such as eyeball rupture, retinal detachment, choroidal detachment, corneal spasm and so on. Normal value: Intraocular pressure: 1.47-2.79kPa Above normal: Glaucoma characterized by increased intraocular pressure, inflammation, crystal swelling, dislocation or rupture due to trauma, crystal cortical obstruction of the anterior chamber and intraocular tumors can cause increased intraocular pressure. negative: Positive: Tips: Many normal people have the highest intraocular pressure in the morning and are at a minimum in the evening or late at night. But some people have peak eye pressures in the afternoon or evening. Some drugs can also cause side effects of increased intraocular pressure. Normal value The range of normal intraocular pressure is 1.47 to 2.79 kPa (11 to 21 mmHg). Clinical significance The role of intraocular pressure is mainly to maintain the shape of the eye and maintain normal physiological functions. Both high intraocular pressure and low intraocular pressure are abnormal. Long-term increase or decrease in intraocular pressure may impair visual function and cause serious consequences. Abnormal result Increased intraocular pressure: for example, glaucoma characterized by increased intraocular pressure is caused by increased secretion of aqueous humor or an obstacle to the aqueous humor discharge system. Inflammation can also cause an increase in intraocular pressure, because the secretion of aqueous humor increases, and the protein content of aqueous humor increases, which affects the discharge of aqueous humor. Inflammation of the lens, dislocation or rupture due to trauma, the cortical corneal obstruction of the anterior chamber and intraocular tumors can cause an increase in intraocular pressure. If it is not treated in time, the long-term intraocular pressure will increase the function of the retina and optic nerve, which may cause blindness. Reduced intraocular pressure: such as ocular rupture, retinal detachment, choroidal detachment, corneal spasm, etc. Long-term treatment can also seriously affect visual function. When the eyeball shrinks, the intraocular pressure is mostly low. High results may be diseases: anterior chamber hemorrhage and glaucoma, acute angle-closure glaucoma, open angle glaucoma, neovascular glaucoma, primary acute angle-closure glaucoma, chronic angle-closure glaucoma, glaucoma caused by lens dislocation matter Before the inspection: Pay attention to the rest to ensure the accuracy of the inspection. When checking: Intraocular pressure and other physiological indicators of the body are as floating as body temperature, heartbeat, blood pressure, etc., as long as it is still within the acceptable range of the optic nerve of the person concerned. In general, the intraocular pressure of a normal person ranges from three to six millimeters of mercury per day, and the range of intraocular pressure fluctuations in glaucoma patients may be larger. The posture of the body also affects the intraocular pressure. When a normal person changes from a sitting position to a flat position, the intraocular pressure may rise by six millimeters of mercury. If the posture is inverted, the intraocular pressure may increase by more than ten millimeters of mercury. Drinking a large amount of fluid (such as five hundred CC) in a short period of time will increase the intraocular pressure. Some medicines can also cause side effects of increased intraocular pressure, the most noteworthy of which are steroid-containing drugs. Whether it is through oral administration, skin application, nasal spray or eye drops, there are opportunities to produce such side effects as long as it contains steroids. After inspection: Prevent strong light from damaging the eyes. Inspection process There are two ways to check the intraocular pressure. One is the measurement method, which is estimated by the doctor's clinical experience. The second is the tonometer measurement method. 1. The finger test method is to make the patient's eyes look down naturally. The examiner touches the eyeball from the top of the upper edge of the sputum with the tip of the two forefingers, and the other fingers are placed on the forehead of the patient for support, and the two index finger tips are alternately lightly pressed. Estimate the level of eye pressure based on the sense of volatility transmitted to your fingertips. Generally, Tn is normal, the intraocular pressure is T+1, 2, and 3, and the intraocular pressure is low at T-1, 2, and 3. 2, tonometry measurement method, divided into two types of depression and flattening. The Schiotz indentation tonometer is commonly used clinically to indent the central portion of the cornea with a weight of weight to measure intraocular pressure. Not suitable for the crowd 1, no inspection indications should not be tested. 2, conjunctival or corneal acute infectious or active inflammation should be used with caution. 3, severe corneal epithelial damage. 4, open eye injury. Adverse reactions and risks This test is generally not harmful to the human body.