Alignment of a wavefront-guided scleral lens correction in the presence of a lens capsulotomy
| Autor: | Lan Chi Nguyen, Matthew J Kauffman, Raymond A. Applegate, Jason D Marsack, Gareth D Hastings |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Adult
medicine.medical_specialty Corneal Wavefront Aberration Materials science genetic structures Contact Lenses medicine.medical_treatment Visual Acuity Keratoconus Refraction Ocular Article Pupil law.invention 03 medical and health sciences 0302 clinical medicine Scleral lens law Ophthalmology Lens Crystalline medicine Humans Iris (anatomy) Posterior Capsulotomy Slit lamp LASIK General Medicine eye diseases Lens (optics) medicine.anatomical_structure 030221 ophthalmology & optometry Capsulotomy sense organs 030217 neurology & neurosurgery Optometry |
| Zdroj: | Cont Lens Anterior Eye |
| ISSN: | 1367-0484 |
| Popis: | Purpose To demonstrate the necessity of aligning a wavefront-guided scleral lens (WGSL) optical correction to the eye’s effective pupil, with misalignments leading to reduced performance. Case report A 34 year old subject with a history of failed LASIK in the left eye, leading to penetrating keratoplasty, extracapsular extraction of the crystalline lens and neodymium:yttrium-aluminum-garnet (Nd:YAG) laser posterior capsulotomy, enrolled in a study examining WGSL performance. Habitual logMAR acuity OS (aided with a scleral lens) was +0.04. Residual higher order root mean square (HORMS) wavefront error (WFE) was 0.28 μm (Φ =4.75 mm, mean age-matched norm =0.17 μm), and objective over-refraction was –0.30 –0.54 × 008. When a WGSL (targeting aberrations up to the 5 th radial order) was manufactured with the wavefront-guided optics aligned to the center of the dilated pupil, logMAR acuity worsened to +0.15, residual HORMS WFE worsened to 0.44 μm (Φ =4.75 mm), and objective over-refraction increased to +1.19 –0.30 × 122. Slit lamp imagery revealed that the effective pupil was no longer defined by the iris of the eye, but rather the capsular opening created by the capsulotomy. When the WGSL was redesigned to align the wavefront-guided optics to the center of the capsular opening, logMAR acuity improved to –0.14, residual HORMS WFE reduced to 0.17 μm (Φ =4.75 mm) and objective over-refraction reduced to +0.20 –0.15 × 111. Conclusion WGSLs are an emerging option for patients with highly aberrated, ectatic and post-surgical corneas whose visual symptoms cannot be alleviated with conventional corrections. However, alignment of the optics of the WGSL to the underlying optics of the eye over the effective pupil is critical in achieving good optical and visual performance. |
| Databáze: | OpenAIRE |
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