Tonometry Device Is Used For Measuring Intraocular Pressure, That Determines Whether The Patient Is At The Risk Of Glaucoma

Tonometry Device

 

A Tonometer is an ophthalmic instrument that uses a probe to measure the intraocular pressure (IOP) inside the eye. IOP is a critical parameter to assess the health of the eyes and to diagnose ocular diseases such as glaucoma and cataracts.

Intraocular pressure is a key diagnostic test used by ophthalmologists to determine the risk of developing glaucoma and cataracts as well as to evaluate treatment progress in patients with glaucoma. It can be measured with many different types of Tonometry Device, each with its own advantages and disadvantages.

Goldmann applanation tonometry is considered the gold standard and remains the primary tool in determining IOP. A tonometer head is mounted on a slit lamp and is placed directly in front of the patient's eye. The head flattens a 3.06mm diameter circle of the central cornea by a small force that is counterbalanced by capillary attraction to the tear film meniscus.

Several errors can affect the accuracy of readings from the Goldmann tonometer, including an excessive amount of fluorescein in the eye, the thickness of the overlapping arcs of the tear film, high astigmatism or irregular corneal shape, and pressure from a finger on the eyelid while taking the measurement.

Some Tonometry Device, such as the iCare rebound tonometer, can be used without topical anesthesia and are therefore a useful alternative for patients who cannot cooperate with GAT or whose corneal surface is impacted by scarring, edema, or other factors.

Portable handheld Tonometry Device allow IOP measurements to be taken supine, especially in bedridden and anesthetized patients who are not able to cooperate with GAT. They can also be used in pediatric patients or when applanation tonometry is not feasible, such as when the patient is unable to position at the slit lamp or if there is limited collaboration between the patient and the examiner.

Rebound Tonometry Device is a newer, more sophisticated version of the Mackay-Marg tonometer that measures IOP by examining the kinetics by which a very subtle probe rebounds from the cornea. This device is faster, more accurate over a wide range of IOPs, and does not require topical anesthesia.

Indentation tonometry is another type of tonometer that uses a curved probe to impact onto the cornea. A small plunger is attached to the end of the probe and measures the resistance.

Reichert Technologies launched Tono-Vera Vet Tonometer consisting an ActiView Positioning System, in February 2021. This system will help in eliminating the need for a topical anesthetic.

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