what is a tonometer used for?
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Tonometry is a diagnostic test that measures the pressure inside your eye, which is called intraocular pressure (IOP). This measurement can help your doctor determine whether or not you may be at risk of glaucoma. Glaucoma is a serious eye disease in which there's an increased fluid pressure within your eye.
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Eye pressure is measured in millimeters of mercury (mm Hg). 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.
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Pupil dilation is performed to purposefully increase the size of the pupils during an eye exam so that the eye doctor can fully examine the health of the optic nerve and retina. The exam is critical to preventing and treating eye conditions that could potentially lead to vision loss.
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Dial bore gauges are mostly used by machinists to measure the inner diameter of bores in motor engines. The speed and accuracy of a dial bore gauge can save a lot of time when used to measure cuts or hole sizes in home remodeling projects.
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['Thermometers.', 'Pulse Oximeters.', 'Blood Pressure Monitors.', 'Sphygmomanometers.', 'Stethoscopes.', 'Nebulizers & Spirometers.', 'Heart Rate Monitors.']
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Optometrists carry out detailed examinations of the eyes to detect defects in vision, signs of injury, ocular diseases (diseases of the eye) or abnormality, and problems with general health.
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['Something to cover the eye, like a paper cup or facial tissue.', 'Scissors.', 'Tape or tack to hang the test chart on the wall.', 'A pencil or pen to record the results.', 'A yardstick, tape measure, or ruler.', 'A flashlight, if available.', 'A well-lighted room at least 10 feet long.']
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Total solids/protein. Table refractometer. This is measured by refractometer and actually measures refractive index versus total protein. It is used as an estimate for total protein (which are the constituents of plasma that have the most effect on the refractive index).
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Prescription-strength phenylephrine ophthalmic is used to constrict blood vessels in the eye and to dilate (make bigger) the pupil for conditions such as glaucoma, before surgery, and before eye examinations. Phenylephrine ophthalmic may also be used for purposes other than those listed in this medication guide.
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Due to foreshortening, nearby objects show a larger parallax than farther objects when observed from different positions, so parallax can be used to determine distances. To measure large distances, such as the distance of a planet or a star from Earth, astronomers use the principle of parallax.
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A ceilometer is a device that uses a laser or other light source to determine the height of a cloud ceiling or a cloud base from the ground. Ceilometers can also be used to measure the aerosol concentration within the atmosphere.
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A refractometer is the instrument used to measure refractive index ("RI"). Although refractometers are best known for measuring liquids, they are also used to measure gases and solids; such as glass and gemstones.
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An eye exam involves a series of tests to evaluate your vision and check for eye diseases. Your eye doctor may use a variety of instruments, shine bright lights directly at your eyes and request that you look through an array of lenses.
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A hand-held refractometer is the industrial standard used to determine the mix ratio of water-soluble coolants that estimates oil concentration from the sample refractive index measured in the Brix scale. The refractometer allows for in situ measurements of oil concentration within industrial plants.
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Visual acuity is typically measured while fixating, i.e. as a measure of central (or foveal) vision, for the reason that it is highest there.
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AZARGA is used to lower pressure in the eye and to treat glaucoma. Glaucoma is a condition in which the pressure of fluid in the eye may be high. However, some people with glaucoma may have normal eye pressure. Glaucoma is usually caused by a build-up of the fluid which flows through the eye.
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Tide gauges measure the height of the sea-surface and are primarily used for measuring tide levels. Most of the tide gauges operated by the Bureau of Meteorology's National Tidal Centre are SEAFRAME stations (Sea Level Fine Resolution Acoustic Measuring Equipment).