Intraocular pressure (IOP) measurement is crucial for diagnosing and managing glaucoma. The Goldmann applanation tonometer (GAT) is the gold standard for IOP measurement, and while the Pulsair non-contact tonometer (NCT) has shortcomings, it appears to offer certain advantages and therefore is a viable option. The purpose of this study is to determine the reliability of NCT as a reliable alternative to GAT for assessing IOP in adult glaucoma patients. This cross-sectional study assessed 200 eyes of 101 patients at a tertiary hospital in Northern Nigeria. We measured IOP with both GAT and NCT. The mean age of the participants was 56 ± 13.2 years. The right eyes had mean IOP values of 16.44mmHg and 14.96mmHg (p<0.05) with GAT and NCT, respectively, while those of the left were 17.59mmHg and 17.01mmHg (p < 0.05). The pachymetrically corrected IOP values in the right eyes were 19.31mmHg and 18.20 mmHg (p<0.05) for GAT and NCT, respectively, while those in the left were 20.05mmHg and 19.22 mmHg (p>0.05). Pachymetrically corrected NCT and GAT showed a positive correlation of 0.861 (p<0.0001). Bland-Altman analysis showed good agreement, especially for pachymetrically corrected data of NCT and GAT, with a considerable majority of subjects (76% for right eyes, 80% for left eyes) showing differences of 1-3 mmHg, while an average of 14% of all eyes had no difference. In conclusion, the NCT provided reliable IOP measurements; however, CCT corrections may be required, as NCT results appear to be more subject to CCT variations.