Nigerian Medical Journal

ORIGINAL ARTICLE
Year
: 2020  |  Volume : 61  |  Issue : 6  |  Page : 323--327

Comparative assessment of the goldmann applanation and noncontact tonometers in intraocular pressure measurements in a sample of glaucoma patients in the Cape Coast Metropolis, Ghana


Samuel Kyei1, Cynthia Pakyennu Gboglu3, Michael Agyemang Kwarteng2, Frank Assiamah4 
1 Department of Optometry and Vision Science, School of Allied Health Sciences, College of Health and Allied Sciences, University of Cape Coast, Cape Coast, Ghana; Department of Optometry, Faculty of Science and Engineering, Bindura University of Science Education, Bindura, Zimbabwe
2 Department of Optometry, Faculty of Science and Engineering, Bindura University of Science Education, Bindura, Zimbabwe; Discipline of Optometry, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa

Correspondence Address:
Dr. Samuel Kyei
Department of Optometry and Vision Science, School of Allied Health Sciences, College of Health and Allied Sciences, University of Cape Coast, PMB, Cape Coast, Ghana

Objectives: The objective of the study was to explore the usage of the Goldmann applanation tonometry and noncontact tonometry interchangeably in the measurement of intraocular pressure (IOP) in glaucoma patients. Materials and Methods: The study involved 441 clinically diagnosed glaucoma patients receiving care at a referral facility. IOP measurements were obtained using both the Noncontact tonometer and Goldmann applanation tonometer The repeatability of the measures was analyzed by comparing the repeated measures of the devices using paired t-test and calculating the correlation coefficient. A Bland–Altman analysis was used to determine the limits of agreement between the two procedures. Results: There were 271 (61.5%) males and 170 (38.5%) females and their age ranged from 18 to 73 years (mean age = 49.37; standard deviation ± 14.81 years). The findings of the study showed significantly lower readings (P < 0.001) of the GAT (right eye = 17.40 ± 7.48 mmHg; left eye = 16.80 ± 7.49 mmHg) compared to the NCT (right eye = 20.15 ± 8.30 mmHg; left eye = 19.74 ± 8.31 mmHg). There was a strong positive correlation between the GAT and NCT findings in the right eye (r = 0.871, n = 441, P < 0.001) and in the left eye (r = 0.887, n = 441, P < 0.001). There was a wide limit of agreement between NCT and GAT measurements. Conclusion: There was statistically significant higher measures obtained with NCT than the GAT but did not exceed the allowable inter-device difference. There was a strong positive correlation between GAT and NCT measurements. However, it is strongly recommended that these devices are not used interchangeably in the monitoring of IOP in glaucoma due to the wide range of limits of agreement.


How to cite this article:
Kyei S, Gboglu CP, Kwarteng MA, Assiamah F. Comparative assessment of the goldmann applanation and noncontact tonometers in intraocular pressure measurements in a sample of glaucoma patients in the Cape Coast Metropolis, Ghana.Niger Med J 2020;61:323-327


How to cite this URL:
Kyei S, Gboglu CP, Kwarteng MA, Assiamah F. Comparative assessment of the goldmann applanation and noncontact tonometers in intraocular pressure measurements in a sample of glaucoma patients in the Cape Coast Metropolis, Ghana. Niger Med J [serial online] 2020 [cited 2021 Sep 26 ];61:323-327
Available from: https://www.nigeriamedj.com/article.asp?issn=0300-1652;year=2020;volume=61;issue=6;spage=323;epage=327;aulast=Kyei;type=0