Tonometry2012

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Mackay Mackay-Marg Mackay Mackay-Marg Marg applanation tonometry •Topical anesthesia required • or IOP about 2 mmHg higher •Calibrate by gravity (as for tono-pen) •Use a condom! •Gently touch probe tip to cornea •Stages of applanation are reflected on the tracing
Tono Tono-pen Tono Tono-pen pen The Tono-pen, a self-contained miniaturized version of the Mackay-Marg electronic, rather than optical, tonometer, is also a hand-held applanation device with a very small “footprint” on the cornea, which makes it easier to use with corneal abnormalities and in any position. A sanitized cover is placed over the tip. Following topical anesthesia, the Tonopen is gently tapped against the cornea. It clicks and shows the pressure reading with every valid contact. When 3-6 valid readings have been obtained it will beep again and display the final averaged reading, with an indicator showing the confidence of the reading based on the standard deviation of the averaged values. NOT ALL TONOPENS ARE CREATED EQUAL (since central plunger reduced to 1mm)
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Tonometry2012

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