International Journal of Research and Review Vol.7; Issue: 1; January 2020 Website: www.ijrrjournal.com Original Research Article E-ISSN: 2349-9788; P-ISSN: 2454-2237 International Journal of Research and Review (ijrrjournal.com) 339 Vol.7; Issue: 1; January 2020 Constant Parameter Linear Phaco in Different Grades of Cataract: A Correlative Study of Visual Acuity with Phaco Time Arun Samal 1 , R J Dash 2 , Z U Khan 3 1 MS Ophthal, DHA, VitreoRetina Trained, Associate Professor Ophthalmology, Hi-Tech Medical College & Hospital, Bhubaneswar, Odisha State, India and Consultant Ophthalmologist, Kalinga Eye Hospital, Dhenkanal, Odisha 2 DM Endocrinology, FRCP(London), Professor, Department of Endocrinology, HI-Tech Medical College & Hospital, Bhubaneswar, Odisha State, India Formerly Head & Director Endocrinology, PGIMER, Chandigarh, India 3 MS Ophthal, Professor, Department of Ophthalmology, HI-Tech Medical College & Hospital, Bhubaneswar, Odisha State, India Corresponding Author: Arun Samal ABSTRACT Purpose: To correlate first day postoperative LogMAR visual acuity with effective phaco time in phacoemulsification surgery with constant phaco parameter setting of linear mode in different grades of cataract. Methods: One hundred forty-one consecutive senile cataract patients were enrolled in the study group. Phacoemulsification surgery in Linear mode with constant phaco parameters performed for grades I to V on exclusion of ocular comorbidities. Data recorded were age, sex, cataract grades as per The Lens Opacities Classification System III(LOCS), Effective Phaco Time (EPT), Total Phacoemulsification time (TPT), preoperative and first day postoperative uncorrected distant visual acuity in LogMAR standard. Results: The mean preoperative visual acuity was >1 LogMAR in 51.77% cases and postoperative <0.5 LogMAR unit in 80% in all the grades of cataract. The Continuous mode Mean EPT both for trenching and sculpting were 38, 50.25, 63.48, 72.62 and 75.235 seconds in Grade I, II, III, IV, and V respectively. The TPT was 81.20, 98.45, 127.23, 149.49 and 163.27 seconds for grade I to V respectively. Improvement of Vision was statistically significant (P < 0.001) among all the grades of cataracts. Conclusion: Constant phaco parameter setting in linear mode both for trenching and sculpting for all the grades of cataract showed improvement of visual acuity. Higher the EPT less was the postoperative visual outcome. Higher the grades of cataract more were the EPT and TPT. EPT was more than other phaco modes in all the grades. Keywords: Cataract grades, Phacoemulsi- fication, Postoperative, Visual acuity INTRODUCTION Cataract is the major cause of blindness having a high prevalence rate in a higher age group and is reversible on timely surgical intervention. Phacoemulsification(PHACO) cataract surgery with Intraocular Lens implantation is the currently used technique for faster functional visual recovery with less intraoperative and postoperative complications than manual surgical procedure. 1,2 There has been constant development of equipment and surgical techniques for quicker visual recovery, and systemic rehabilitation with fewer complications. 3 PHACO cataract surgery carried out on Phaco needle excursion on Longitudinal, Transversal and Torsional Phacoemulsification machines. Ultrasound energy is delivered on continuous, pulse, burst, hyper pulse and hyper burst