Original Research

A comparative study of central corneal thickness (CCT) and intraocular pressure (IOP) in University of KwaZulu-Natal students of Black and Indian ethnicity*

Z. Sardiwalla, D. Moodley, T. Ndawonde, A. Madikizela, N. Ngobese, N. Thobela
African Vision and Eye Health | South African Optometrist: Vol 71, No 4 | a83 | DOI: https://doi.org/10.4102/aveh.v71i4.83 | © 2012 Z. Sardiwalla, D. Moodley, T. Ndawonde, A. Madikizela, N. Ngobese, N. Thobela | This work is licensed under CC Attribution 4.0
Submitted: 09 December 2012 | Published: 09 December 2012

About the author(s)

Z. Sardiwalla, Discipline of Optometry, UKZN, South Africa
D. Moodley, Discipline of Optometry, UKZN, South Africa
T. Ndawonde, Discipline of Optometry, UKZN, South Africa
A. Madikizela, Discipline of Optometry, UKZN, South Africa
N. Ngobese, Discipline of Optometry, UKZN, South Africa
N. Thobela,, South Africa

Full Text:

PDF (721KB)

Share this article

Bookmark and Share

Abstract

Thisstudy compared central corneal thickness (CCT) and intraocular pressure (IOP) of Black and Indian students from the University of Kwa-Zulu-Natal. Two hundred (100 Black and 100 Indi-

an) participants of both genders aged 18-25 years (mean and standard deviation; 20.1±1.6 years) participated in this study. CCT and IOP were measured for the right eye of each participant using a Tono-Pachymeter (NT530P) and a Goldmann applanation tonometer (GAT) respectively. Data was analyzed with descriptive, t-test and Pearson’s cor-relation statistics. In the total sample (N = 200), the mean CCT value was 519.5 ± 38.6 μm and CCT was higher in the Indians (526.5 ± 37.2 µm) than in the Blacks (512.4 ± 38.9 µm) (p = 0.01).  Also, it was higher in the females (522.3 µm) than in males (516.7 µm), but the difference was insignificant (p = 0.07). The mean CCT was higher in the Indian males (520.1 µm) than in the Black males (513.2 µm), but the difference was insignificant (p=0.39).  However, it was significantly higher in the Indian females (533 µm) than in the Black females (511.6 µm) (p = 0.003). In the total sample, the mean IOP was 14.6 mmHg and IOP was greater in Indiansthan Blacks (mean = 15.3 ± 2.9 mmHg and 13.8 ± 2.6 mmHg respectively) (p = 0.01). Also, the mean
IOP (N = 200) value was slightly higher in the females (14.7 mmHg) than in males (14.5 mmHg) (p = 0.51). The mean IOP was higher in the Indian males (15.0 mmHg) than in the Black males (14.0 mmHg) (p = 0.07) and the mean IOP value was
higher in the Indian females (15.7 mmHg) than in the Black females (13.6 mmHg) (p < 0.001). The higher mean IOP value in the Indian than Black participants was attributed to the higher mean CCT values. A positive, but inconsistent association between CCT and IOP was found in this study, the coefficient in the total sample (r = 0.382, p = 0.000), in the Blacks (r = 0.196, p = 0.05) and in Indians (r = 0.498, p = 0.000). A national population study comparing CCT and IOP in the various South African ethnic groups is recommended. Cognizance of these differences should be taken in the diagnoses of glaucoma in these ethnic groups. (S Afr Optom 2012 71(4) 171-177)


Keywords

Central corneal thickness; intraocular pressure; ethnicity and corneal thickness; ethnicity and intraocular pressure

Metrics

Total abstract views: 2629
Total article views: 3949

 

Crossref Citations

1. Genetic factors influencing the reduction of central corneal thickness in disorders affecting the eye
Joanna Swierkowska, Marzena Gajecka
Ophthalmic Genetics  vol: 38  issue: 6  first page: 501  year: 2017  
doi: 10.1080/13816810.2017.1313993