Impression Tonometry and the Effect of Eye Volume Variation

IT is generally accepted that the amount by which an eye can be indented by a given tonometric load will depend on the initial internal pressure and the elastic properties of the cornea and sclera. This paper sets out to show that the amount of indentation will also depend on the initial volume of the eye. In its simplest form, the hypothesis states that, if there are two eyes of differing initial volumes but with equal internal pressures, then for a given tonometric load, the larger eye will be more indentable than the smaller eye.