en بینایی سنجی Optometry پژوهشي Research <strong>Background and Objectives:</strong> Evaluation of changes in refractive errors and biometric parameters in the process of glycemic control in people with type 2 diabetes during three-month treatment.<br> <strong>Methods</strong>: Patients with the first diagnosis of type 2 diabetes or a history of poor glycemic control (hemoglobin glycate more than 7.5%) and without any systemic disease other than diabetes were included. Hemoglobin glycate, refractive error, and biometric parameters were evaluated before treatment and one and a half and three months after treatment, and their changes were examined by generalized estimating equation (GEE) analysis.<br> <strong>Results</strong>: A total of 60 eyes of 30 patients with a mean age of 51.63&plusmn;6.79 years were evaluated. Hemoglobin glycate decreased by an average of 1.028% compared to the baseline measurement in the third month (P<0.001). Mean spherical (P=0.554), spherical equivalent (P=0.340), axial length (P=0.147), and anterior chamber depth (P=0.336) did not show a significant difference between the three examinations. In contrast, the lens thickness showed a significant decrease during treatment (P=0.001). Finally, generalized estimating equation (GEE) analysis showed that a 1% decrease in hemoglobin glycate increased by 0.226 mm. (P=0.002) in the axial length. It should be mentioned in tables FU1means Follow-up 1.5 months and FU2 means Follow-up 3 months.<br> <strong>Conclusion</strong>: The present study shows that refractive errors and most ocular biometric parameters do not change significantly compared to the baseline levels in the period of one and a half and three months after the start of glycemic control.<br> &nbsp; Cornea, Diabetes, Ocular biometry, Refractive error 0 0 http://fdj.iums.ac.ir/browse.php?a_code=A-10-227-1&slc_lang=en&sid=1 Amir Asharlous arasturkom@gmail.com 10031947532846002776 10031947532846002776 No Department of Optometry, Rehabilitation Research Center, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran. Abbas Riazi abas.riazi@gmail.com 10031947532846002777 10031947532846002777 No Department of Optometry, Rehabilitation Research Center, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran. Samira Janani Janani_om91@yahoo.com 10031947532846002778 0009-0001-4739-0750 No Department of Optometry, Rehabilitation Research Center, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran. Sattar Rajabi sattar.rajabi@yahoo.com 10031947532846002779 10031947532846002779 Yes Department of Optometry, Rehabilitation Research Center, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran. Amir Rakhshan amirrakhshan@gmail.com 10031947532846002780 10031947532846002780 No Department of Foreign Languages, Faculty of Foreign Languages and Literatures, Tehran University of Medical Sciences, Tehran, Iran. Mehdi Khabazkhoob khabazkhoob@yahoo.com 10031947532846002781 10031947532846002781 No Department of Basic Sciences, School of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Zahra Sadat Dibaji Forooshani atousadiba@yahoo.com 10031947532846002782 10031947532846002782 No Bank Melli Hospital, Tehran, Iran. Hamed Tabesh tabeshh@mums.ac.ir 10031947532846002783 10031947532846002783 No Department of Medical Informatics, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.