The purpose of our study was to evaluate the correlation between the new index - visual field index (VFI) and mean deviation index (MD) and pattern standard deviation (PSD) in patients with glaucoma. MD, PSD and VFI were calculated in data about 103 eyes obtained from a cross-sectional study in 103 eyes of 58 patients with mild to severe glaucoma or ocular hypertension. The correlation of VFI to MD, PSD was evaluated with linear regression models, and the coefficient of determination (r) was calculated. | JOURNAL OF MEDICAL RESEARCH CORRELATING OF THE VISUAL FIELD INDEX WITH MEAN DEVIATION AND PATTERN STANDARD DEVIATION IN GLAUCOMA PATIENTS Bui Thi Huong Giang, Pham Thi Kim Thanh Department of Ophthamology , Hanoi Medical University The purpose of our study was to evaluate the correlation between the new index - visual field index (VFI) and mean deviation index (MD) and pattern standard deviation (PSD) in patients with glaucoma. MD, PSD and VFI were calculated in data about 103 eyes obtained from a cross-sectional study in 103 eyes of 58 patients with mild to severe glaucoma or ocular hypertension. The correlation of VFI to MD, PSD was evaluated with linear regression models, and the coefficient of determination (r) was calculated. The result showed that the average values of VFI, MD and PSD were , dB and dB respectively. The VFI and the MD were linearly correlated with r = . For the patients with VFIs below 90%, the correlation with the MD was better than for the patients with VFIs 90% and above (r = vs ). There was no statistically significant difference in VFI value between the group with cataract and the group without cataract (p > ) but MD varied significantly between these two groups (p 20% were excluded. Inclusion criteria included a clinical diagnosis of primary glaucoma or ocular hypertension and absence of other retinal disease. They had a best corrected visual acuity (VA) equal to or better than 20/60 and refractive error within ± D sphere and ± D astigmatism. 2. Methods This cross-sectional study was performed between December 2015 and April 2016 at Glaucoma department, Vietnam National Institute of Ophthalmology. To calculate the sample size of this crosssectional study, we assumed that the rate of visual field loss in glaucoma patients was 85% [6]. The following formula was used: N = [(Z 1-α/2)2 ] / d2. To achieve 95% confidence intervals (CIs) and 7% error, 103 eyes from 58 patients were .
