Summary: We determined the value of central corneal thickness (CCT) in Congolese patients with primary open-angle glaucoma (POAG) and assessed its impact on intraocular pressure (IOP). Patients and Methods: We conducted a cross-sectional study at the University Hospital of Brazzaville. IOP was measured using a Goldmann applanation tonometer. Pachymetry was performed with an optical pachymeter (Topcon TRK-2P). Adjusted IOP was determined using the Ehlers correction table. Data were collected on standardized forms, entered using CSPro 7.4, and analyzed with the public health software SPSS 25. Results: Mean IOP in the right eye was 23.16 ± 8.66, with values ranging from 10 to 55. Mean IOP in the left eye was 23.21 ± 9.24, with values ranging from 10 to 57. Mean CCT in the right eye was 515.13 ± 38.23 μm, ranging from 434 to 590. Mean CCT in the left eye was 512.22 ± 34.56 μm, ranging from 435 to 582. Mean adjusted IOP in the right eye was 23.87 ± 8.05, ranging from 10 to 50. Mean adjusted IOP in the left eye was 23.88 ± 8.29, ranging from 10 to 57. The difference between mean adjusted IOP and non-adjusted IOP was statistically significant (p = 0.03). Conclusion: Patients with POAG have corneas that are thinner than the Caucasian average, which results in overestimated ocular pressures that must be taken into account for diagnosis, treatment, and follow-up.
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