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Comparison between corrected intraocular pressure using contact vs non-contact methods in glaucoma patients

Poster Details

First Author: T.Badran EGYPT

Co Author(s):    R. El Shereif   M. Galal   M. El Bahrawy              

Abstract Details


To determine the difference between corrected intraocular pressure (IOP), based on the central corneal thickness (CCT), measured by the non contact anterior segment AS-OCT, versus contact ultrasound pachymetry in management of glaucoma patients.


Ain Shams University, Ophthalmology Department, Cairo, Egypt Watany Research and Development Center (WRDC), Cairo, Egypt


The study is a prospective non randomized case series, including 50 patients diagnosed with open angle glaucoma and controlled with medical treatment with prostaglandin analogs and beta blockers fix combination , controlled under medical treatment, in which (CCT) is measured by 2 methods, the AS-OCT (Cirrus HD-OCT model 5000 by Zeiss, Germany) and by the ultrasound pachymetry of ocular response analyser (Reichert, USA). IOP was measured by applination tonometry. Corrected IOP was calculated adjustment factor using Ehler's correction nomogram, statistical analysis of the adjusted IOP with the contact and non contact methods was done in relation to the CCT measurements.


Mean 60.5 years +/- 5.24, 46% were females, mean CCT using AS-OCT for the right eye was 529.86 microns +/- 43.52 and for the left eye was 530.28 microns +/- 43.57, while CCT using US Pachymetry for the right eye 534.88 microns +/- 43.59, for and for left eye 533.34 microns +/- 44.33. Highly significant correlation between CCT measured by AS-OCT and US; 0.94 (P<0.01). Mean adjusted IOP by AS OCT CCT was 15.56 mm/hg +/- 2.83 (11:22) and IOP adjusted by US pachymetry was 15.32 mm/hg +/- 2.78 (10:21), no significant differences (P=0.29) and highly significant correlation 0.96 (P<0.01)


Although ultrasound pachymetry has slightly higher measurements of central corneal thickness in comparison with measurements with anterior segment OCT, it has no significance on the adjusted IOP in controlled glaucoma patients, making the 2 methods equally accurate in the management and follow up of these patients.

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