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Visual effect of the combined correction of spherical and longitudinal chromatic aberrations

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Abstract

An instrument permitting visual testing in white light following the correction of spherical aberration (SA) and longitudinal chromatic aberration (LCA) was used to explore the visual effect of the combined correction of SA and LCA in future new intraocular lenses (IOLs). The LCA of the eye was corrected using a diffractive element and SA was controlled by an adaptive optics instrument. A visual channel in the system allows for the measurement of visual acuity (VA) and contrast sensitivity (CS) at 6 c/deg in three subjects, for the four different conditions resulting from the combination of the presence or absence of LCA and SA. In the cases where SA is present, the average SA value found in pseudophakic patients is induced. Improvements in VA were found when SA alone or combined with LCA were corrected. For CS, only the combined correction of SA and LCA provided a significant improvement over the uncorrected case. The visual improvement provided by the correction of SA was higher than that from correcting LCA, while the combined correction of LCA and SA provided the best visual performance. This suggests that an aspheric achromatic IOL may provide some visual benefit when compared to standard IOLs.

©2010 Optical Society of America

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Figures (8)

Fig. 1
Fig. 1 Schematic diagram of the adaptive optics system. A near infrared diode laser illuminates the eye and a set of telescopic relays imaged the eye pupil plane onto the membrane deformable mirror (MDM) and the H-S sensor. Both elements working in closed-loop set the target wave aberration. At the same time, the subject can perform visual tests through the modified aberrations using the CRT monitor with the vision limited to an artificial pupil, due to aperture A1. A motorized Badal optometer allows changing the focus in the system.
Fig. 2
Fig. 2 Schematic diagram of the optical setup used to objectively measure the chromatic aberration induced by the LCA corrector. For simplicity, most of the optical system shown in Fig. 1, is omitted. A wavelength tunable wavefront sensor is implemented on the adaptive optics system. The Xe-lamp and the set of interference filters illuminate the achromatizer plate at different wavelengths in the visible range. A detailed view of the achromatizer plate and its diffractive structure is also shown
Fig. 3
Fig. 3 Wave aberrations at different wavelengths of the LCA corrector, measured by means of the white-light H-S sensor. In the upper row is shown the whole aberration, including defocus, for each wavelength. In the lower row only the higher-order terms, with the corresponding RMS for a 5.5 mm pupil, are shown.
Fig. 4
Fig. 4 LCA induced by the achromatizer plate and the optical setup through which the visual test was performed later. It is compared with the LCA predicted by the Chromatic Eye model, showing that, as expected in the design stage of the achromatizer prototype, both chromatic aberrations are opposite.
Fig. 5
Fig. 5 Diagram of the changes introduced in the adaptive optics system for measuring the quality of the LCA correction in real eyes. The white-light lamp and the interference filters are used to illuminate at different wavelengths a slide that is seen by the subject through the achromatizer plate. The subject, for each wavelength, must bring in focus the image in the slide, using the Badal optometer. From the different Badal positions for each wavelength, the total LCA is obtained.
Fig. 6
Fig. 6 LCA (with and without the corrector) in three subjects (PA, SM and HW). Dashed lines with open symbol represent the measured natural LCA, and solid lines with filled symbols the corrected LCA . Curves were shifted to cancel out defocus at 532 nm.
Fig. 7
Fig. 7 VA of the subjects PA, SM, HW and the average across them with spherical aberration and chromatic aberration similar to that of the average pseudophakic patient’s eye, corrected spherical aberration, corrected chromatic aberration and corrected spherical and chromatic aberration. (Error bar represents standard deviations).
Fig. 8
Fig. 8 CS at 6 cycles/degree for subjects PA, SM, HW and the average across them with spherical aberration and chromatic aberration similar to that of the average pseudophakic patient, corrected spherical aberration, corrected chromatic aberration and corrected spherical and chromatic aberration. (Error bar represents standard deviations).
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