Diurnal versus office-hour intraocular pressure fluctuation in primary adult onset glaucoma.

PURPOSE To evaluates the role of measuring intraocular pressure (IOP) outside office-hour in primary adult onset glaucoma. METHODS This retrospective study included 100 cases of primary adult onset glaucoma. IOP readings obtained with Goldmann applanation tonometry between 7 am and 10 pm were compared to office-hour readings. RESULTS One hundred patients were enrolled (mean age: 58.64 ± 10.98 years) in the study. Overall, mean diurnal IOP was significantly higher than mean office IOP (p < 0.05). Two-thirds of the patients had peak IOP measurements outside office-hour. Mean diurnal IOP fluctuation (7.03 ± 2.69 mm Hg) was significantly higher than mean office IOP fluctuation (4.31 ± 2.6 mm Hg) (p < 0.003). There was a significant correlation between baseline IOP and fluctuation in IOP (r = 0.61, p<0.001). CONCLUSION The mean diurnal IOP and IOP fluctuations were higher than office-hour readings in patients with primary adult onset glaucoma. Diurnal monitoring may be particularly useful in patients with high baseline IOP.