Journal Article10.3109/02713683.2011.566978
Tomography-based customized IOL calculation model.
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TL;DR: A four-surface eye model using a numerical ray-tracing method is proposed for customized IOL calculation and high resolution OCT data can be used as a sufficient base for a customized I OL characterization.
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Abstract: Purpose: To provide a mathematical calculation scheme for customized intraocular lens (IOL) design based on high resolution anterior segment optical coherence tomography (AS-OCT) of anterior eye segment and axial length data.Material and Methods: We use the corneal and anterior segment data from the high resolution AS-OCT and the axial length data from the IOLMaster to create a pseudophakic eye model. An inverse calculation algorithm for the IOL back surface optimization is introduced. We employ free form surface representation (bi-cubic spline) for the corneal and IOL surface. The merit of this strategy is demonstrated by comparing with a standard spherical model and quadratic function. Four models are calculated: (1) quadratic cornea + quadratic IOL; (2) spline cornea + quadratic IOL; (3) spline cornea + spline IOL; and (4) spherical cornea + spherical IOL. The IOL optimization process for the pseudophakic eye is performed by numerical ray-tracing method within a 6-mm zone. The spot diagram on the fovea...
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Citations
Descriptors of Corneal Shape
Richard G Lindsay,George Smith,David A. Atchison +2 more
- 01 Jan 1998
TL;DR: The purpose of this technical note is to clarify the relationships between these various descriptors of corneal shape.
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Vignetting and field of view with the KAMRA corneal inlay.
TL;DR: For combinations of pupil sizes and field angles, the attenuation of image brightness reaches levels up to 60% and the theoretical findings have to be clinically validated with detailed investigation of this vignetting effect.
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Index of contrast sensitivity (ICS) in pseudophakic eyes with different intraocular lens designs
TL;DR: To evaluate the index of contrast sensitivity in eyes after cataract surgery with various intraocular lens designs and to compare with the area under log contrast sensitivity curve (AULCSF).
26
Comparison of retinal image quality with spherical and customized aspheric intraocular lenses
TL;DR: It is concluded that customized lenses should give improved retinal image quality despite the random errors resulting from IOL insertion.
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Ray-tracing Analysis of the Corneal Power From Scheimpflug Data.
TL;DR: Exact ray tracing can be used on mapped tomography data to analyze for the effective corneal power and may be a promising tool in the analysis of the true power of the cornea of any shape.
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TL;DR: The results suggest that real-time OCT has potential applications in glaucoma evaluation and refractive surgery and high-speed OCT at 1310-nm wavelength is a potentially useful technique for noninvasive assessment of anterior segment structures.
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