A Shack-Hartmann aberrometer was used to assess the optical performances of eyes corrected with rigid or soft contact lenses compared with spectacles. Metrics of optical quality derived from the measured wave aberrations were consistent with the subjective rating of visual clarity by subjects. Optical aberration analysis illustrated the differences in aberration structures of eyes wearing diffe...

Peripheral vision and off-axis aberrations not only play an important role in daily visual tasks but may also influence eye growth and refractive development. Thus it is important to measure off-axis wavefront aberrations of human eyes objectively. To achieve efficient measurement, we incorporated a double-pass scanning system with a Shack Hartmann wavefront sensor (SHWS) to develop a scanning ...

PURPOSE To evaluate the relationship between high-order aberrations and refractive errors, and between high-order aberrations and age. METHODS An analytic retrospective study of patients that underwent aberrometry examination was conducted. All subjects examined with LadarWave aberrometer at the Hospital de Olhos do Paraná from April 2004 to April 2005 were included in this study. The major i...

The refractive errors of normal, healthy eyes were measured using an indigenously developed Shack Hartmann aberrometer. Measurement was made in both right and left eyes after dilation for a 6mm pupil size. Power vector method was used to represent the sphero cylindrical errors. Analysis was done for astigmatism with the rule, oblique astigmatism and defocus between the right and left eyes of th...

Most Shack-Hartmann based aberrometers use infrared light, for the comfort of the patients. A large amount of the light that is scattered from the retinal layers is recorded by the detector as background, from which it is not trivial to estimate the centroid of the Shack-Hartmann spot. For a centroiding algorithm, background light can lead to a systematic bias of the centroid positions towards ...

Measurement of the eye's wave aberrations has become fairly standard in recent years. However, most studies have not taken into account the possible influence of the polarization state of light on the wave aberration measurements. The birefringence properties of the eye's optical components, in particular corneal birefringence, can be expected to have an effect on the wave aberration estimates ...

PURPOSE To investigate the accuracy of the Carl Zeiss Meditec Wavefront Supported Custom Ablation (WASCA) aberrometer in refraction testing for Chinese myopic adults. METHODS Manifest refraction and WASCA were performed on 360 eyes of 360 consecutive Chinese myopic adults without cycloplegia. Both vector analysis and conventional notation were applied for comparing results, and differences be...

Purpose : to compare anatomical and optical parameters aberrations of both eyes in patients with acquired congenital anisometropic myopia. Material methods . 22 (44 eyes) aged 18–35 (averagely, 25.2) myopia were examined using the Galilei G6 eye system analyzer (Ziemer, Switzerland). The analysis total, corneal internal was carried out on an OPD-Scan III (Nidek) aberrometer. Results In groups m...