Exact(5)
Bland-Altman plots show the agreement between OA-2000 swept-source opticoherenceence tomography and Lenstar optical low coherence reflectometry for measuring lens thickness.
Based on this light scattering principle, the probe which consists of a laser diode, measuring lens and a linear photodiode array, is designed to capture the scattered light from a test surface with a relatively large scattering angle ϕ (=28°).
The proposed algorithm of measuring lens diameter locates the lens center through the Euclidean distance array, and determines the lens edge along an initiated ray using linear interpolation with sub-pixel accuracy.
Preliminary experimental comparison and analyses indicate that, the lateral and axial resolutions of PFDCM are better than 0.2 μm and 2 nm, respectively, when wavelength of incidence laser beam λ= 632.8nm, numerical aperture of measuring lens NA= 0.85, and lateral spot size with a three-zone phase-only pupil filter GT= 0.65.
The other investigator was unmasked and responsible for group allocation, lens fitting and aftercare, measuring lens performance, record keeping and compliance checking.
Similar(55)
2. The lens sag is calculated from a single fringe pattern of large-size microlens, in combination with the measured lens diameter.
We measured lens thicknesses, both centrally and at a 3 mm peripheral location, of a range of optical powers of two different spherical silicone hydrogel contact lens designs (manufactured by Ciba Vision and Bausch & Lomb) and one "traditional" hydrogel.
The aim of this study was to examine how age and in vivo measured lens transmission of blue light might affect pupil light responses, in particular, mediated by the ipRGC.
If age was substituted by the in vivo measured lens transmission of blue light in the correlation analysis, the pupil response change to blue light was only found significant for the early poststimulus AUC at high intensity stimulus conditions.
As a second step, we examined the relationship between an in vivo measured lens transmission of blue light and pupil responses to monochromatic blue light at various intensities in the healthy subjects in order to better understand, if the normal physiological changes in the aging lens might modulate certain light dependent responses of the eye, such as melanopsin activation.
This non-contact optical inspection system is suitable for measuring the lens sag and 3D surface profile of symmetrical and unsymmetrical microlenses.
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