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Martin Baumeister, Claudia Gabriel, Oliver K. Klaproth, Christine Titke, Jens Buehren, Thomas Kohnen; Ocular Wavefront Aberrations And Optical Quality In Different Accommodative States Measured By A Ray-tracing Aberrometer. Invest. Ophthalmol. Vis. Sci. 2012;53(14):1346.
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Evaluation of ocular wavefront changes during accommodation using an open-view ray tracing aberrometer.
In 50 eyes of 50 healthy subjects (median age: 26 years, range: 20 - 35 years) wavefront measurements were performed in different viewing distances (4 m, 1 m, 60 cm, 50 cm, 40 cm) using an open view aberrometer (iTrace, Tracey Technologies, Houston TX).
Defocus differed significantly between all accommodative stimuli. (-0,01 (-3,5; 1,42)/ -0,29 (-3,53; 0,50)/ -0,68 (-3,52; -0,07)/ -1,01 (-3,54; -0,41)/ -1,50 (-3,66; -0,63). With stimulus distances of 60 cm and closer a significant decrease in Z4,0 (spherical aberration) was detectable. (0,056 (-0,13; 0,37)/ 0,05 (-0,17; 0,39)/ 0,03 (-0,21; 0,41)/ 0,02 (-0,23; 0,36)/ 0,00 (-0,24; 0,34). Astigmatism and residual aberrations did not show significant changes. Retinal image quality as expressed by the best corrected visual Strehl ratio based on the optical transfer function (BCVSOTF) showed a significant decrease with the nearest stimulus compared to the unaccommodated state (-0.65/-0.70; p=0.02).
The open-view aberrometer can display changes in ocular wavefront error with accommodation. Significant changes in defocus, spherical aberration and optical quality could be shown.
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