Journal of Clinical and Experimental Ophthalmology
Open Access
ISSN: 2155-9570
ISSN: 2155-9570
Hardik Parikh
Global Eye Clinic, India
Scientific Tracks Abstracts: J Clin Exp Ophthalmol
Purpose: Intraocular lenses (IOLs) with aspheric design were introduced to reduce higher order aberrations; particularly spherical aberrations (SA) post cataract surgery and improve quality of vision. However, not many studies evaluate whether adding the aspheric design actually results in reduced SA in the real world scenario. We compare the SA induced by implanting IOLs with an aspheric design versus regular spherical design after routine clear corneal phacoemulsification. Setting: Single surgeon series in a private practice setting. Methods: In this prospective, non-randomized study, patients with uncomplicated age related cataracts without any ocular comorbidities and good mydriasis scheduled for routine phacoemulsification were offered a choice between hydrophobic IOLs with an aspheric (Rayner, Alcon, Zeiss etc.) or spherical design (Rayner). Preoperative work up included visual acuity, slit lamp evaluation, dilated fundus evaluation and measurement of SA using the Huvitz HRK system (8000A) under scotopic conditions. All patients underwent uneventful clear corneal phacoemulsification with IOL implantation. At 1 month follow up, all patients underwent refraction and measurement of SA under scotopic conditions using the same instruments. Results: We enrolled 120 eyes of 80 patients in the study with a mean age of 61.2+8.4 years. Of these 85 eyes (71%) of 55 patients had aspheric IOL and 35 eyes (29%) of 25 patients had spherical IOLs. Preoperative characteristics were comparable between the two groups. At 1 month, the mean SA in eyes with aspheric IOLs was 0.055 + 0.09 and in those with spherical IOLs was -0.015 + 0.08 (p=0.21). Eyes with aspheric IOL had marginally better uncorrected vision (0.06 + 0.09 logMAR) compared to spherical IOLs (0.1 + 0.1 logMAR) (p=0.07). The spherical equivalent was comparable. Conclusion: There were differences between different types of IOLs in terms of spherical aberrations induced one month after cataract surgery. IOLs with an aspheric design appear to provide no additional benefit over spherical IOLs. Studies with a greater sample size and longer follow up are required to establish superiority of aspheric IOLs in the real world scenario.
Hardik Parikh is an experienced and well trained cataract and refractive surgeon who specialises in Multifocal IOLs, premium lenses and Toric IOLs. He has vast experience in LASIK surgery and Phakic IOLs to correct refractive error. He has presented at various national and international conferences.