Intraocular Pressure
Schiotz tonometer: Measures the
The eye is first anesthetized and the patient is made to lie down. The instrument is then placed over the eye and the needle shows a deflection which is read from a chart for the
Applanation tonometer: This is a small measuring device attached to the slit lamp. Eye is anesthetized and stained with a yellow dye. The applanation device is then gently touched on the black part of the eye to measure the eye pressure under blue light.
Non contact tonometer: It measures the eye pressure by a puff of air on your eye. There is no contact with the eye and is a painless procedure. Based on the eye’s resistance to the puff of air, the intraocular pressure is measured by the machine.
Schiotz’s tonometer is the means of screening and gives a rough estimate of the eye pressure. Applanation tonometer is a gold standard for accurate eye pressure measurement while the non contact tonometer gives a fairly accurate result with the advantage that it does not touch the eye.
