To take a reading by a non-contact tonometer, the time taken for the initial air puff to reach the area of the cornea which is flattened is measured in milliseconds. It generally takes less time for a soft eye than it does for a hard eye. The market of non-contact measurement systems is largely dominated by these non-contact tonometers, which find extensive use in the diagnosis of glaucoma. Nowadays there has been seen a significant rise in the sale of the Goldmann tonometers, which do not fall under the category of non-contact measurement systems. What matters mostly for both these tonometers is the fact that thinner the cornea is, the lower are the pressure readings.