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Identifier 000360959
Title Υδροδυναμική μελετη του οφθαλμού-Σύγκριση του οφθαλμικού εύρους παλμού όπως μετρήθηκεαπό το τονόμετρο Pascal και από μανομετρική πειραματική διάταξη
Alternative Title Comparison of ocular pulse amplitude as obtained with pascal dynamic contour tonometer and an invasive experimental device for the intraoperative measurement and control of IOP developed at University of Crete
Author Λιμνοπούλου, Αλίκη
Thesis advisor Παλλήκαρης, Ιωάννης
Thesis advisor Τσιλιμπάρης, Μιλτιάδης
Κουνής, Γεώργιος
Abstract Purpose: to compare OPA as measured with Pascal dynamic contour tonometry with the measures as obtained with an experimental device operating on the basis of direct eye canulation. Coefficient of ocular rigidity, pulsatile ocular blood flow and coefficient of outflow facility through trabecular Meshwork were recorded. OPA was correlated with axial length, age, POBF, systemic pulse amplitude, coefficient of ocular rigidity. Materials and Methods: 31 patients undergoing cataract surgery whose IOP was measured with Pascal tonometer before the operation were enrolled in the study. After canulation of the anterior chamber a computer controlled device for the intraoperative measurement and control of IOP was used to raise IOP from 10 to 40mmHg with a stepping procedure. After each infusion step IOP was continually recorded for 2 seconds. The pressure volume relation was approximated with an exponential fit and the coefficient of ocular rigidity was computed. OPA, POBF, were measured from continuous IOP recordings. Results: No statistically significant difference between OPA values as obtained with the Pascal tonometer (mean = 2,84mmHg, SD = 1,121) and with the manometric device (mean = 2,72mmHg, SD = 0,92) was found. (paired t-test: p = 0,587). Mean difference = 0,11mmHg, 95% CI = - 0,302 to 0,524mmHg. A statistically significant positive correlation was found between OPA values as measured by the two methods: r = 0,406, p =0,023. According to Bland-Altman analysis 95% LI = -2,140 to 2,362mmHg. No statistically significant correlation was found between OPA values and age, axial length, POBF, systemic pulse amplitude, coefficient of ocular rigidity. Conclusions: Mean difference of OPA values obtained with Pascal tonometry and the experimental device is negligible. However, each of these methods may provide different results when tested on the same individual and this relatively poor agreement between measurements can be clinically significant. Our manometric methodology may be used for calibration of any non invasive method for the determination of ocular pulsation.
Language Greek
Subject Ophthalmology
Tonometry, Ocular
Issue date 2009-12-14
Collection   School/Department--School of Medicine--Department of Medicine--Post-graduate theses
  Type of Work--Post-graduate theses
Notes Διατμηματικό μεταπτυχιακό πρόγραμμα σπουδών : "Οπτική και Όραση".
Permanent Link https://elocus.lib.uoc.gr//dlib/e/b/b/metadata-dlib-b5626419d81a477559947bbe8039fd7d_1285930012.tkl Bookmark and Share
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