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Intraocular pressure (IOP) is the fluid pressure inside the eye. Tonometry is the method eye care professionals use to determine this. IOP is an important aspect in the evaluation of patients at risk of glaucoma. [1] Most tonometers are calibrated to measure pressure in millimeters of mercury .
Ocular hypertension is the presence of elevated fluid pressure inside the eye (intraocular pressure), usually with no optic nerve damage or visual field loss. [1] [2]For most individuals, the normal range of intraocular pressure is between 10 mmHg and 21 mmHg. [3]
The higher the intraocular pressure, the harder it is to push against and indent the cornea. For very high levels of IOP, extra weights can be added to make the plunger push harder. [14] The movement of the plunger is measured using a calibrated scale. [14] The Schiøtz tonometer is the most common device to use this principle.
For eye pressures, a value of 28 hPa (21 mmHg) above atmospheric pressure 1,010 hPa (760 mmHg) is often used, with higher pressures leading to a greater risk. [2] [26] However, some may have high eye pressure for years and never develop damage. [2] Conversely, optic nerve damage may occur with normal pressure, known as normal-tension glaucoma. [27]
Normal. Less than 120 and. Less than 80. Elevated. 120-129 and. Less than 80. Stage 1 Hypertension. 130-139 or. 80-89. Stage 2 Hypertension. 140 or higher or. 90 or higher
Pressure is applied to the cornea until the inner edges of two semicircular fluorescein mires come into contact, forming a continuous circle. The corresponding reading on the tonometer scale represents the IOP of the measured eye. Intraocular pressure (IOP) can be measured by tonometry devices. The eye can be thought of as an enclosed ...
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The largest letter on an eye chart often represents an acuity of 6/60 (20/200), the value that is considered "legally blind" in the US. Many individuals with high myopia cannot read the large E without glasses, but can read the 6/6 (20/20) line or 6/4.5 (20/15) line with glasses.
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