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OCT-based crystalline lens topography in accommodating eyes
#MMPMID26713216
Pérez-Merino P
; Velasco-Ocana M
; Martinez-Enriquez E
; Marcos S
Biomed Opt Express
2015[Dec]; 6
(12
): 5039-54
PMID26713216
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Custom Spectral Domain Optical Coherence Tomography (SD-OCT) provided with
automatic quantification and distortion correction algorithms was used to measure
anterior and posterior crystalline lens surface elevation in accommodating eyes
and to evaluate relationships between anterior segment surfaces. Nine young eyes
were measured at different accommodative demands. Anterior and posterior lens
radii of curvature decreased at a rate of 0.78 ± 0.18 and 0.13 ± 0.07 mm/D,
anterior chamber depth decreased at 0.04 ± 0.01 mm/D and lens thickness increased
at 0.04 ± 0.01 mm/D with accommodation. Three-dimensional surface elevations were
estimated by subtracting best fitting spheres. In the relaxed state, the
spherical term accounted for most of the surface irregularity in the anterior
lens (47%) and astigmatism (70%) in the posterior lens. However, in accommodated
lenses astigmatism was the predominant surface irregularity (90%) in the anterior
lens. The RMS of high-order irregularities of the posterior lens surface was
statistically significantly higher than that of the anterior lens surface (x2.02,
p<0.0001). There was significant negative correlation in vertical coma (Z3 (-1))
and oblique trefoil (Z3 (-3)) between lens surfaces. The astigmatic angle showed
high degree of alignment between corneal surfaces, moderate between corneal and
anterior lens surface (~27 deg), but differed by ~80 deg between the anterior and
posterior lens surfaces (including relative anterior/posterior lens astigmatic
angle shifts (10-20 deg).
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