What is tonometer used for?
A tonometry test measures the pressure inside your eye, which is called intraocular pressure (IOP). This test is used to check for glaucoma, an eye disease that can cause blindness by damaging the nerve in the back of the eye (optic nerve).
What is the normal range for tonometer?
Then a doctor or technician uses a device called a tonometer to measure the inner pressure of the eye. A small amount of pressure is applied to the eye by a tiny device or by a warm puff of air. The range for normal pressure is 12-22 mm Hg (“mm Hg” refers to millimeters of mercury, a scale used to record eye pressure).
What are the types of tonometers?
Types of tonometry
- Goldmann and Perkins applanation tonometry. The Goldmann applanation tonometer measures the force necessary to flatten an area of the cornea of 3.06mm diameter.
- Non-Contact Tonometry.
- Ocular Response Analyzer.
- Schiotz Tonometer.
How accurate is non-contact tonometer?
The Non-contact tonometer readings were more accurate in the pressure range less than 20 mm Hg. The readings obtained with the use of topical anaesthesia tend to be lower compared to readings obtained without the use of topical anaesthetic.
Does tonometer touch the eye?
Non-contact (or air-puff) tonometry does not touch your eye but uses a puff of air to flatten your cornea. This type of tonometry is not the best way to measure intraocular pressure. But it is often used as a simple way to check for high IOP and is the easiest way to test children.
What is the most accurate tonometer?
Goldmann applanation tonometer
The Goldmann applanation tonometer (GAT) is considered accurate, highly reliable, and simple to use. Moreover, this instrument is extremely well established in clinical use and research.
Which is the best tonometer?
The best tonometer for home use to monitoring glaucoma
- The “intelligent” Tonometer- Icare ic100 ($1,950.00)
- Best for personal use- Icare home tonometer ($1,000.00)
- A versatile and accurate tonometer- Reichert tono-pen avia ($1,590.00)
- A credible and reliable tonometer- Reichert tono-pen XL ($1,290.00)
How much does a home tonometer cost?
The cost of purchasing an Icare tonometer will greatly depend on the exact model, its condition on where you purchase it. If purchasing new, you’re going to want to plan on spending anywhere from $3,300 for a device used for home use to as much as $5,200+ for one designed for a professional office setting.
What is normal eye pressure for adults?
Normal eye pressure ranges from 12-22 mm Hg, and eye pressure of greater than 22 mm Hg is considered higher than normal. When the IOP is higher than normal but the person does not show signs of glaucoma, this is referred to as ocular hypertension.
What is the principle of non-contact tonometer?
Noncontact tonometer It is an applanation tonometer and works on the principle of a time interval. Measuring the time from initial generation of the puff of air to cornea gets flattened (in milliseconds) to the point where the timing device stops.