Rebound Tonometer
Rebound Tonometer - Related Videos
07:00
A Laser-induced Mouse Model of Chronic Ocular Hypertension to Characterize Visual Defects
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Cited by 26 •
2013
Chronic ocular hypertension is induced using laser photocoagulation of the trabecular meshwork in mouse eyes. The intraocular pressure (IOP) is elevated for several months after laser treatment. The decrease of visual acuity and contrast sensitivity of experimental animals are monitored using the optomotor test.
08:56
Lateral Canthotomy and Inferior Cantholysis
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2023
Source: James W Bonz, MD, Emergency Medicine, Yale School of Medicine, New Haven, Connecticut, USA Lateral canthotomy is a potentially eyesight-saving procedure when performed emergently for an orbital compartment syndrome. An orbital compartment syndrome results from a buildup of pressure behind the eye; as pressure mounts, both the optic nerve and its vascular supply are compressed, rapidly leading to nerve damage and blindness if the pressure is not quickly relieved. The medial and lateral...
03:04
Induction of Elevated Intraocular Pressure in a Rat Model
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2025
Source: Lani-Louzada, R., et al., Full-Circle Cauterization of Limbal Vascular Plexus for Surgically Induced Glaucoma in Rodents. J. Vis. Exp. (2022)This video demonstrates the induction and monitoring of elevated intraocular pressure (IOP) in a rat model. The process involves cauterizing the limbal blood vessels, resulting in vessel occlusion and elevated IOP. The rat is then allowed to recover, and IOP is regularly monitored in both the experimental and control eyes for comparison.
10:12
Newton's Laws of Motion
0 Views •
2023
Source: Andrew Duffy, PhD, Department of Physics, Boston University, Boston, MA This experiment examines at various situations involving two interacting objects. First, the experiment examines the forces that two objects apply to one another while they collide. The objects are wheeled carts that have variable masses. The purpose of this experiment is to discover when the force the first cart exerts on the other is the same magnitude as the force the second cart exerts back on the first, as well...
07:49
Development of an Experimental Setup for the Measurement of the Coefficient of Restitution under Vacuum Conditions
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Cited by 11 •
2016
The coefficient of restitution is a parameter that describes the loss of kinetic energy during collision. Here, a free-fall setup under vacuum conditions is developed to be able to determine the coefficient of restitution parameter for particles in micrometer range with high impact velocities.
FAQs
The instrument analyzes how the probe slows as it approaches the corneal surface and how it rebounds afterward. These motion characteristics reflect the resistance encountered at the cornea. The device then converts that response into an estimate of intraocular pressure, allowing clinicians to obtain a pressure measurement from a brief interaction.
A small, lightweight probe supports a brief measurement and contributes to patient comfort. Because the procedure generally requires little or no topical anesthetic, clinicians can use it efficiently when minimizing preparation is important. The instrument’s handheld format also makes pressure assessment practical in settings where portability is valuable.
Corneal resistance provides the physical response that the instrument evaluates. Differences in the probe’s deceleration and rebound behavior are related to how the corneal surface responds during the measurement, and the device translates that response into an IOP estimate. This relationship is central to interpreting the instrument’s pressure readings.
Repeated measurements help clinicians look for changes in intraocular pressure rather than relying only on a single reading. A pattern of changing values can identify patients who may need further ophthalmic evaluation or treatment. This makes the technique useful for monitoring pressure over time, including during glaucoma assessment.
The clinician uses the handheld instrument to briefly propel its small probe toward the cornea. The device observes the probe’s deceleration and rebound behavior, then produces an IOP estimate. The rapid sequence supports routine assessment without necessarily requiring topical anesthetic, depending on the clinical situation.
Clinicians may use rebound tonometry for screening, routine intraocular pressure assessment, or ongoing pressure monitoring. Its rapid operation and generally limited need for topical anesthetic can support patient-friendly examinations. Portability further broadens its usefulness when pressure measurements are needed outside settings equipped for more extensive ophthalmic assessment.
The resulting IOP estimates provide information relevant to detecting and monitoring glaucoma, as well as assessing other eye disorders in which pressure measurement matters. Repeated values can help reveal changes over time. When findings suggest a meaningful change, they can support decisions about further ophthalmic evaluation or treatment.