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January 1999

Tonometry and Corneal Thickness

Arch Ophthalmol. 1999;117(1):104-105. doi:10.1001/archopht.117.1.104

EVERYONE WHO has excised a cornea has had the opportunity to observe that the normal cornea tends to maintain its watch-glass shape if external forces due to pressure, gravity, and surface tension are neutralized. This inherent stiffness of the cornea has been a subject of study for those interested in the accuracy of applanation tonometry, beginning with the inventive work of Goldmann and Schmidt1 in the middle of this century. It is reasonable to assume that the stiffness of the cornea would vary somewhat from one person to another and that this property would logically be related to the physical dimensions of the tissue, especially its thickness.