Introduction: Worldwide and in our nation, cataracts are the leading cause of blindness. The most common side effect following cataract extraction is posterior capsule opacification (PCO), which can happen in as many as 50% of cases and impairs light transmission and visual acuity. The purpose of this study is to assess the changes in visual acuity brought on by PCO formation following the implantation of polymethyl methacrylate (PMMA) rigid intraocular lenses (IOLs) and acrylic foldable IOLs. Methodology: One hundred patients with Type 1 and Type 2 diabetes mellitus participated in this prospective, comparative investigation. There were two groups of patients: A 13.5mm PMMA IOL was implanted in Group A. 13.0mm acrylic IOLs were implanted in Group B. During post-operative visits at one week, two weeks, two months, four months, and six months, the visual acuity of the study participants was assessed. Results: Post-operatively, in the first week, all 50 (100%) patients had their visual acuity in the range of 6/9 – 6/6 in both groups with none in the range of 6/18 – 6/12.At second week all 50 (100%) patients had their visual acuity in the range of 6/9 – 6/6 in Group B whereas 49 (98%) patients had their visual acuity in the range of 6/9 – 6/6 in Group A and 1 (2%) in the range of 6/18 – 6/12. At second month, all 50 (100%) patients had their visual acuity in the range of 6/9 – 6/6 in Group B whereas 47 (94%) patients had their visual acuity in the range of 6/9 – 6/6 in Group A and 3 (6%) in the range of 6/18 – 6/12. At 4th month, 49 out of 50 patients (98%) had their visual acuity in the range of 6/9 – 6/6 and the remaining 1(2%) in the range of 6/18 – 6/9 in Group B whereas 43 (86%) patients had their visual acuity in the range of 6/9 – 6/6, 5 (10%) in the range of 6/18 – 6/9 and 2 (4%) in the range of 6/24 – 6/18 in Group A. AT 6th month 49 out of 50 patients (98%) had their visual acuity in the range of 6/9 – 6/6 and the remaining 1 (2%) in the range of 6/18 – 6/9 in Group B whereas 41 patients (82%) had their visual acuity in the range of 6/9 – 6/6, 6 in the range of 6/18 – 6/9 and 3 in the range of 6/36 – 6/24 in Group A. Conclusion: The modern cataract intra ocular lens surgery has produced good visual results but this effect could be short term with the development of PCO affecting visual acuity, which is the most frequent complication following conventional cataract surgery. Compared to PMMA IOL, the rate of moderate to severe PCO grades was lower with Acrylic IOL in our study; this difference was statistically and clinically significant. Visual result was good with Acrylic IOL when compared to PMMA, this also being statistically significant and clinically noticeable.