Progressive-toric IOL design reduces residual astigmatism with increasing pupil size: a ray-tracing simulation based on corneal topography data
Population studies indicate that astigmatism decreases from the corneal center toward the periphery. A standard toric intraocular lens (IOL) with a constant cylinder power cannot correct uniformly across this gradient. We built an astigmatic eye model based on corneal topography data. A progressive-...
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| Main Authors: | , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
23 Feb 2021
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| In: |
Biomedical optics express
Year: 2021, Volume: 12, Issue: 3, Pages: 1568-1576 |
| ISSN: | 2156-7085 |
| DOI: | 10.1364/BOE.417894 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1364/BOE.417894 Verlag, lizenzpflichtig, Volltext: https://www.osapublishing.org/boe/abstract.cfm?uri=boe-12-3-1568 
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| Author Notes: | Grzegorz Łabuz, Dorottya Varadi, Ramin Khoramnia, Gerd U. Auffarth |
| Summary: | Population studies indicate that astigmatism decreases from the corneal center toward the periphery. A standard toric intraocular lens (IOL) with a constant cylinder power cannot correct uniformly across this gradient. We built an astigmatic eye model based on corneal topography data. A progressive-toric lens with gradually decreasing cylinder power was compared with an identically designed lens but featuring conventional astigmatism correction. Residual astigmatism did not differ significantly (P=0.06) at 3 mm, and the Strehl ratio was identical for both lenses (0.51 ±0.15, P=0.88). At 5 mm, the progressive IOL yielded significantly lower residual astigmatism by 0.10 D (P<0.001). The Strehl ratio was 0.30 ±0.08 with the progressive and 0.29 ±0.08 with the standard lens (P<0.001). At 3 mm, the optical performance was comparable for both IOLs. However, at 5 mm, the progressive-toric was more effective in correcting astigmatism, and it yielded reduced residual astigmatism compared to a standard toric lens. |
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| Item Description: | Gesehen am 21.05.2021 |
| Physical Description: | Online Resource |
| ISSN: | 2156-7085 |
| DOI: | 10.1364/BOE.417894 |