What Are the Causes of Pressure Behind the Eye?

Intraocular pressure is the pressure inside the eyeball, which is called intraocular pressure for short. It is the equilibrium pressure exerted by the contents of the eye on the wall of the eyeball. The IOP of a normal person is stabilized within a certain range to maintain the normal shape of the eyeball and maintain a good refractive state at the interfaces of each refractive medium. Normal IOP ranges from 10mmHg to 21mmHg (1.33kPa to 2.80kPa).

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Non-contact tonometer (barometric tonometer)

Full-automatic non-contact tonometer with the features of joystick-free, full-automatic focus, three-dimensional full-automatic eye tracking, and quiet operation. When using full-automatic jet pressure measurement, a gentle jet wave will be generated and hit your cornea through the air wave Reflect the pressure value back to determine the level of your intraocular pressure. Patients only need to rely on the forehead of the instrument to fixate on the fixation target. Using the patented joystick-free autofocus system, the operator only needs to press the button to activate the intraocular pressure (IOP) measurement program. Forehead support slides left and right, and the internally upgraded software can automatically recognize left and right eyes.

advantage

Convenient, fast, safe and hygienic, can be used repeatedly.

Disadvantage

For some patients, the measurement data is not accurate, such as patients with thick cornea.

Contact tonometer (flattening tonometer)

The contact tonometer has a certain clinical accuracy. The principle is that the patient's eyeball is directly contacted by the pressure needle, and the patient's intraocular pressure value is determined by the depth of the cornea after the pressure is applied. The tonometer should be placed on the test bench for each measurement. The pointer must be in the "0" position before use. If it is not in the "0" position, the pointer position must be adjusted so that the pointer reaches the "0" position. The pressure needle should be disinfected with alcohol before use to avoid infection to the patient during use.

advantage

Accurate measurement, with clinical accuracy, is the most accurate measurement method at present.

Disadvantage

Improper use can easily lead to infection. Patients must order anaesthetic when using it, which has certain side effects on the body.

Portable tonometer

There are many types, which are generally used in small clinics, with low accuracy, but suitable for carrying. Generally, such tonometers are not recommended as a basis for diagnosis if conditions permit.