Visual quality after posterior chamber phakic intraocular lens implantation in keratoconus
| Autor: | Bhujang Shetty, Mathew Kurian, Rohit Shetty, Ridhima Bhagali, Somshekar Nagappa |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Adult
Male Phakic Intraocular Lenses medicine.medical_specialty Refractive error Keratoconus Corneal Wavefront Aberration Visual acuity genetic structures Visual Acuity Coma (optics) Refraction Ocular Phakic intraocular lens Root mean square Lens Implantation Intraocular Ophthalmology Myopia medicine Humans Prospective Studies Dioptre business.industry Aberrometry Posterior Eye Segment medicine.disease eye diseases Sensory Systems Posterior chamber phakic intraocular lens Female Surgery medicine.symptom business |
| Zdroj: | Journal of Cataract and Refractive Surgery. 38:1050-1057 |
| ISSN: | 0886-3350 |
| Popis: | Purpose To quantify image-quality characteristics after correction of refractive error with a posterior chamber phakic intraocular lens (PC pIOL) in eyes with stable or stabilized keratoconus. Setting Narayana Nethralaya Postgraduate Institute of Ophthalmology, Bangalore, India. Design Case series. Methods Eyes with stable or stabilized keratoconus that had V4 Visian PC pIOL implantation for correction of refractive error were evaluated postoperatively for visual-quality metrics. Results Ten eyes of 7 patients had PC pIOL implantation. The preoperative mean refractive spherical equivalent of −7.21 diopters (D) ± 2.25 (SD) decreased to −0.55 ± 1.53 D at 6 weeks and −0.44 ± 1.21 D at 6 months. The efficacy index was 0.72 and the safety index, 1.13. The mean modulation transfer function (MTF) was 18.96 ± 14.16 (≥30 cycles per degree = good), the Strehl ratio was 0.11 ± 0.07 (1 = perfect), and the objective scatter index (OSI) was 4.45 ± 3.29 (≥1.5 = significant scatter). The MTF correlated inversely with secondary coma (P=.026), negative vertical coma (P=.014), and the root mean square (RMS) of total aberrations (P=.010) and higher-order aberrations (HOAs) (P=.015). The OSI was directly correlated with secondary coma (P=.021), secondary trefoil (P=.016), the RMS of total aberrations (P=.032), and HOAs (P=.050). Conclusion In keratoconus, the refractive error could be corrected with the PC pIOL; however, the associated aberrations had an adverse impact on the ultimate visual quality and have to be addressed. Financial Disclosure No author has a financial or proprietary interest in any material or method mentioned. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|