منابع مشابه
Evaluation of photographic methods for documentation of lens opacities.
Several systems have been developed to document lens opacities photographically. In general, the settings for these photographs have been standardized, but there has been no scientific basis for the selection of these settings. We investigated several of these variables. We examined the effect of degree of angulation of the slit beam in slit photography of the nucleus and found no difference in...
متن کاملModeling Based on Photographic Data
Photography is a 2-dimensional medium which represents 3-dimensional space, as a central projection on a plane. As it is possible to represent 3D space by a photograph, it is also possible, using mathematical methods, to obtain data about 3-dimensional structures from the data registered on photographs. We used two methods to obtain spatial data from photographs: restitution of perspective imag...
متن کاملThe effect of testing distance on intraocular lens power calculation.
The calculation of the intraocular lens (IOL) power required for a specific patient typically uses a “lens constant” back-calculated from the refractive outcomes of earlier surgical results.1,2 An early recommendation was for clinicians to personalize their own lens constants to address systematic errors. However, the introduction of phacoemulsification equipment, continuous curvilinear capsulo...
متن کاملStudies on lens proteins. I. Subunit structure of beta crystallins of rabbit lens cortex.
A method has been developed to isolate and characterize beta-crystallins of rabbit lens cortex. Chromatographic separation of water-soluble structure proteins of rabbit lens cortex on a Sephacryl S-200 gel column yielded four beta-crystallin peaks (beta1, beta2, beta3 and beta4), all eluting between alpha and gamma-crystallins. Their molecular weights were estimated to be 250,000, 130,000, 60,0...
متن کاملPhotographic response to x-ray irradiation. I: Estimation of the photographic error statistic and development of analytic density-intensity equations.
Formulations for specular optical density as a function of incident x-ray intensity are shown to be inadequate, theoretically and compared with available data. Approximations assuming low intensities, grain densities, or energies yield significant error in typical emulsions. Unjustifiable simplifications limit analysis and consequent results. The avoidance of assumptions leads to models for rou...
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ژورنال
عنوان ژورنال: Časopis pro pěstování matematiky a fysiky
سال: 1901
ISSN: 1802-114X
DOI: 10.21136/cpmf.1901.108807