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LD-HD

Aberrations in keratoconus

In patients complaining of a reduction in optical quality, aberrometry is a key investigation. It offers the possibility to segregate between low order aberrations, which can be corrected by spectacles, and higher-order aberrations, which explain most of the visual disturbances that persist despite spectacle correction. However, as we will see in this example of a […]

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Aberrations post presby-LASIK

This clinical case provides a classic example of the limitations of the Zernike series to characterize the typical deformation of the ocular wavefront after LASIK surgery of hyperopia and presbyopia (« presby-LASIK »). Although the concept of using higher order aberrations such as negative spherical aberration to increase the ocular multifocality is well accepted, there has been […]

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Pre- and Post-LASIK aberrations comparison

Pre- and Post- LASIK aberrations with Standardized Zernike vs LD-HD wavefront reconstruction method We present another case to highlight the difference between the Zernike and LD-HD (Low Degree/High Degree) wavefront decompositions. As we will see in this case, the presence of Higher Order Aberrations (HOAs) not only result in an artefactual alteration of the low […]

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