COMPARISON OF PERFORMANCE STANDARDS   BETWEEN UNIFOCAL AND MULTIFOCAL INTRAOCULAR LENSES FOLLOWING CATARACT SURGERY

J.Samuel Cornelius Gnanadurai; S.Preethi

Volume : VI, Issue : II, February - 2016

COMPARISON OF PERFORMANCE STANDARDS BETWEEN UNIFOCAL AND MULTIFOCAL INTRAOCULAR LENSES FOLLOWING CATARACT SURGERY

J. Samuel Cornelius Gnanadurai, S. Preethi

Abstract :

Aim: To compare post operative parameters like uncorrected visual acuity (UCVA), best corrected visual acuity(BCVA), Near Vision, Contrast sensitivity between unifocal and multifocal intra ocular lenses( IOLs) following cataract surgery. Materials & Methods: This randomized clinical study was conducted on 66 patients with loss of vision due to only cataract attending outpatient clinics of Department of Ophthalmology at Sri Ramachandra Medical College, Porur during Aug 2007 to Aug 2009. Out of 66 patients 33 patients were operated with unifocal IOL, 33 patients with multifocal IOL. All were operated using conventional co axial Phacoemulsification. Patients were examined on 1st post operative day, at end of 1st week and 8th week. Results: The mean age of patients in unifocal group was 55 years, while in multifocal group was 56.5 years. At end of 8th week, 85% unifocal group had UCVA of 6/9 or better and76% of multifocals had UCVA of 6/9 or better. The BCVA of 6/6 at end of 8th week was found in 100% of unifocal group and 91 % of multifocal group. Drop in vision of remaining patients was due to cystoid macular oedema. On analysis of near vision, at the end of 8th week, 0% unifocal patients had N6 vision while nearly 52% of multifocal group had N6 vision. Near vision add for unifocals was 2–2.5D and for multifocals 1–1.25D to enable patients to see N6 vision at 33cm. Unifocals patients retained their BCVA with reduction of contrast to 10–14% while multifocal patients found it difficult to retain BCVA with drop in contrast to 20–25%. Conclusion: The distance visual acuity was similar in patients implanted with Unifocal and Multifocal IOLs where most of them had a BCVA of 6/9 or better. Unaided near vision was better in Multifocal IOLs who were able to read N6 at end of 8th week compared to unifocal IOLs who had N8 or N10. There was significant reduction in Contrast sensitivity and subjective experience of halos among multifocal group.