Importance of corneal thickness in applanation tonometry

Download Importance of corneal thickness in applanation tonometry

Post on 29-Sep-2016

218 views

Category:

Documents

0 download

TRANSCRIPT

<ul><li><p>GLAUCOMA ANDOCULARHYDRODYNAMICS </p><p>Importance of corneal thickness in applanation tonometry </p><p>BY </p><p>N . Ehlers and T . Bramsen </p><p>Department of Ophthalmology, h h u s Kommunehospital, </p><p>Arhus. Danmark </p><p>In several groups of non-glaucomatous patients a positive s ta t is t ical correlat ion was found between central corneal thickness and intraocular p r e s s u r e measured by applanation tonometry. Normal corneal thickness was found in glaucoma s im- plex, a thick cornea was found in ocular hypertension and a thin cornea in low- tension glaucoma. </p><p>On the assumption that the thickness influences the measured value of the in- t raocular p r e s s u r e , as emphasized in the original papers of Goldmann, readings with the applanation tonometer were made a t various intraocular hydrostatic pres - s u r e s and compared with central corneal thickness. In human eyes with a normal corneal thickness tonometer readings and hydrostatic p r e s s u r e coincide, with thick corneas the readings were too high, with thin corneas too low. The correlat ion be- tween corneal thickness and the e r r o r of applanation tonometry ( A P ) was statisti- cally highly significant (p -=O .001) . A table h a s been calculated, showing the cor - rection to be added to the applanation reading a t the various corneal thickness-valuet The central corneal thickness is a parameter which should be taken into considera- tion when evaluating applanation tonometer readings. </p><p>The A 0 - non contact tonometer BY </p><p>P . Nelleman Sbrensen </p><p>Department of Ophthalmology, Rigshospitalet, Copenhagen, Denmark </p><p>The measurement of the intraocular pressure by a non contact tonometer was c o r - related to Goldmann tonometer in 20 normal persons , 20 glaucomatous patients and 8 patients suffering from corneal d i seases . </p><p>persons to their skill of fixation and in the eye patients to height of p r e s s u r e and t o corneal state. </p><p>The e r r o r in measurement for the non contact tonometer was related in normal </p><p>33 </p></li></ul>

Recommended

View more >