[The coats of the eyeball and the intraocular pressure (author's transl)].
The coats of the eyeball influence the results of tonometry 1. by their response to changes of intraocular volume and pressure as expressed by the deltaP/deltaV-ratio and 2. by the rigidity of the cornea. None of the clinical methods in use is able to measure the true deltaP/deltaV-ratio in vivo. Therefore this factor has to be either eliminated from tonometry or measured by a rather complicated new procedure as described in this paper. The rigidity of the cornea as measured on enucleated eyes, offers a resistance increasing significantly with the thickness of the cornea, the size of the applanation and the altitude of the intraocular pressure. It might be neglected in applanations up to 3 mm in diameter, in larger applanations however it becomes a remarkable source of error.
D003315:Cornea; D004548:Elasticity; D005123:Eye / Q000033:anatomy & histology*; D006801:Humans; D007429:Intraocular Pressure; D008433:Mathematics; D014065:Tonometry, Ocular
Bulbushüllen und Augendruck