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To identify the most common cause and the frequent stage of presentation in patients with neovascular glaucoma. Materials and Methods: The present study is a prospective observational study. 136 eyes of 109 patients having neovascular glaucoma in one eye or both the eyes were included in the study. All patients underwent thorough ocular examination i.e., visual acuity, slit lamp bio-microscopy, intraocular pressure (IOP) measurement by Goldmannapplanation tonometry, gonioscopy with Posner 4 mirror indirect gonioscope and dilated fundus examination. Neovascularization of iris (NVI) was identified in an undilated state, presence of any ectropionuveae, hyphema, anterior chamber reaction, pseudoexfoliative material, keratic precipitates and other signs of uveitis were noted. The number of quadrants of the angle having neovascularization was noted. Results: The mean age was 57.59 ± 12.6 years, 80.73% were males and 19.26% were females. Mean IOP was 27.14 ± 11.3 mm of Hg. 74 (54.4%) presented in rubeosisiridis stage, 38 (27.9%) in angle closure stage and 24 (17.6%) in open angle stage. 89 (65.4%) had diabetic retinopathy in variable severity, 16 (11.7%) had uveitis and 14 (10.2%) had retinal vein occlusion. Mean IOP angle closure stage was found to be 36.53±16.259 mm of Hg which is significantly higher than the other two stages (P = 0.000) Conclusion: In the present study, it was found that Proliferative diabetic retinopathy is the most common cause and rubeosisiridis is the most common stage of presentation in NVG.

The aim of this study was to measure the intraocular pressure (IOP) by Perkins hand held tonometer, non contact tonometer(NCT) and rebound tonometer with the Gold standard GAT and to analyse their correlation with varied CCT. Materials and Methods: Cross-sectional, hospital-based study that included 200 patients from the glaucoma department. After complete eye evaluation, the IOP measurement was performed sequentially in the same order-NCT, RT, Perkin's and GAT. CCT was then measured for all the patients. The intraocular pressure within the eyes was compared by paired "t" test and between the right and left eyes were compared by the independent "t" test. Results: Mean age of the patients was 54.5±13.5 years. The mean IOP of Right and Left eyes measured with GAT were 15.9±6.2 and 16.3±7.0 mm/Hg, that with Perkins were 15.7±6.2 and 16.3±7.0 mm/Hg respectively. Both eyes' mean IOP were 15.4±6.7 and 15.9±7.4 mm/Hg by Icare. The mean IOP measured by NCT were 16.4±6.7 and 16.9±8.0 mm/Hg. The mean CCT of right eye was 528.9± 29.6 and left eye was 530.6±29.6 microns. All the four instruments namely GAT, Perkin's, Icare ic100 and NCT were influenced by CCT. Conclusions: IOP remains the only alterable factor in the management of glaucoma patients. Numerous methods have been devised to measure IOP accurately. The IOP measured with Perkin's, NCT and Icare are comparable but GAT remains the gold standard.

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