• Tonometer

    Tonometer – Augen (Riester) – NSL – 5112

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    ₨21,000

    Description
    Features
    • High quality agate bearing for an extremely long service life
    • Precision measurement on a scale of 0 to 20 subdivisions and 0 to -1 sub-divisions
    • Perfect reading of the scale with red pointer
    • All vital parts are made of stainless steel, other parts are chrome-plated
    • Complete in a black deluxe case with velvet-look inserts
    • Supplied with three weights (5.5 g, 7.5 g, 10 g) and a conversion table
    • Made in Germany
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    SKU:Oph-259-5112. Categories:, Tags:,,,,,,,,,,

    Tonometer is the procedureeye care professionalsperform to determine theintraocular pressure(IOP), the fluidpressureinside theeye. It is an important test in the evaluation of patients at risk fromglaucoma.[1]Most tonometers are calibrated to measure pressure in millimeters of mercury (mmHg).

    In applanation tonometry the intraocular pressure (IOP) is inferred from the force required to flatten (applanate) a constant area of thecornea, for theImbert-Fick law.[2]The Maklakoff tonometer was an early example of this method, while the Goldmann tonometer is the most widely used version in current practice.[3]Because the probe makes contact with the cornea, atopical anesthetic, such asproxymetacaine, is introduced on to the surface of the eye in the form of aneye drop.
    Goldmann tonometry is considered to be thegold standardIOP test and is the most widely accepted method.[4] [5]A special disinfected prism is mounted on the tonometer head and then placed against the cornea. The examiner then uses a cobalt blue filter to view two green semi circles. The force applied to the tonometer head is then adjusted using a dial connected to a variable tension spring until the inner edges of the green semicircles in the viewfinder meet. When an area of 3.06 mm (0.120 in) has been flattened, the opposing forces of corneal rigidity and the tear film are roughly approximate and cancel each other out allowing the pressure in the eye to be determined from the force applied. Like allnon-invasivemethods, it is inherently imprecise and may need to be adjusted.

    Dynamic contour tonometry (DCT) uses the principle of contour matching instead of applanation. The tip contains a hollow the same shape as the cornea with a miniaturepressure sensor在它的中心。与扁平tonometry it is designed to avoid deforming the cornea during measurement and is therefore thought to be less influenced by corneal thickness and other biomechanical properties of the cornea than other methods but because the tip shape is designed for the shape of a normal cornea, it is more influenced by corneal curvature.[9]

    The probe is placed on the pre-cornealtear filmon the central cornea (see gallery) and the integratedpiezoresistivepressure sensorautomatically begins to acquire data, measuring IOP 100 times per second. The tonometer tip rests on the cornea with a constant appositional force of one gram. When the sensor is subjected to a change in pressure, the electrical resistance is altered and the tonometer’s computer calculates a change in pressure according to the change in resistance. A complete measurement cycle requires about eight seconds of contact time. The device also measures the variation in pressure that occurs with the cardiac cycle.

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