Results 131 to 140 of about 4,307 (179)
Some of the next articles are maybe not open access.
Archives of Ophthalmology, 1969
Meridional refractometry is a process whereby the meridional power of the corrective lens is measured in three predetermined meridians of the eye and the final prescription calculated from these data. The calculation is based on equations derived from Laurance's approximation of the meridional power of a cylindrical lens.
R F, Brubaker +2 more
openaire +2 more sources
Meridional refractometry is a process whereby the meridional power of the corrective lens is measured in three predetermined meridians of the eye and the final prescription calculated from these data. The calculation is based on equations derived from Laurance's approximation of the meridional power of a cylindrical lens.
R F, Brubaker +2 more
openaire +2 more sources
Instant photographic refractometry in children
Acta Ophthalmologica, 1988Abstract. A simple photographic method for detection and measurement of refractive errors in children, using a specially designed camera and electronic flash unit and ‘instant’ (Polaroid) film, was tested on 64 children, aged 3 to 8 years, and compared with the results from retinoscopy. The refractive errors ranged from ‐6.5 to +6.5 D.
P, Wanger, G, Waern
openaire +2 more sources
Interferometry and refractometry of snail amoebocytes
Experimental Cell Research, 1959Abstract Quantitative cytological data have been obtained for different regions of living snail amoebocytes in tissue culture using cell refractometry and interferometry. The modal solid concentration in the cytoplasm was found to be 13.5 ± 0.5 g per 100 ml as measured by immersion refractometry.
R, BARER, D A, DICK
openaire +2 more sources
Liquid refractometry by the rainbow method
Applied Optics, 1998A new method for measuring the refractive index of liquid, proposed in a previous paper [Appl. Opt. 36, 5552-5556 (1997)], has been developed. The minimum deviation of a laser beam deflected by a liquid-filled cylindrical cell was calculated by use of geometric optics.
H, Hattori +3 more
openaire +2 more sources
2015
Abstract The refractive index of materials is one of their most basic optical properties. In the case of liquids, the refractive index has been employed by chemists for many years to document sample purity. The simplest way to determine the refractive index is by measuring the angle at which light bends at an interface between two ...
Robert N. Compton, Michael A. Duncan
openaire +1 more source
Abstract The refractive index of materials is one of their most basic optical properties. In the case of liquids, the refractive index has been employed by chemists for many years to document sample purity. The simplest way to determine the refractive index is by measuring the angle at which light bends at an interface between two ...
Robert N. Compton, Michael A. Duncan
openaire +1 more source
Refractometry and Interferometry of Living Cells*†
Journal of the Optical Society of America, 1957The development of phase contrast and interference microscopy has focused attention on the possibility of measuring the refractive indexes of living cells. Difficulties are encountered in applying immersion methods of refractometry to living cells because the choice of immersion media is very limited.
openaire +2 more sources
Three-dimensional rainbow refractometry
Optics LettersWe propose a new, to the best of our knowledge, rainbow technique called three-dimensional rainbow refractometry (TDRR), with a cylindrical lens in the signal collecting system. With a TDRR model based on the ray transfer matrix developed, it is proved that the tilt angle of the rainbow signal is related to the axial position of the droplet, which ...
Zhiwen, Deng +6 more
openaire +2 more sources
Refractometry of fluids in microscopic tubes
Applied Optics, 1979Fluid filling a tube immersed in a medium that matches the index of the tube acts as a cylindrical lens. Because of geometrical aberrations, the focal length cannot be used directly for an accurate determination of refractive index. By observing the focal position with a microscope that has an aperture regulating diaphragm in the back focal plane, the ...
openaire +2 more sources