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Arch Ophthalmol. 1999;117:104-105.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

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.

Confirmation of this notion has been demonstrated experimentally. When a normal cornea is thicker, the tonometric reading is higher than the manometric pressure; when a normal cornea is thinner, the reading is lower.^2-4 When the cornea is weakened, either by excimer ablation⁵ or . . . [Full Text of this Article]

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