The Cardinal Points in Corrected Ametropia
نویسندگان
چکیده
منابع مشابه
Pascal’s ring, cardinal points, and refractive compensation
Pascal's ring is a hexagon each of whose corners represents one of the six cardinal points of an optical system and whose sides represent relationships of relative axial position of the cardinal points. Changes to the ring represent the axial displacements of the cardinal points of the visual optical system of an eye that are caused when a spectacle lens compensates for the ametropia. Pascal's ...
متن کاملThe binocular accommodative response in uncorrected ametropia.
PURPOSE To measure the changes in astigmatism and in the degree of anisometropia when ametropes respond to accommodative stimulation. METHODS The accommodative responses of ametropes were binocularly measured with an improved photorefractometer (PR-1100), which objectively measured binocular refraction in all meridians simultaneously, when a visual fixation target was shown in natural space a...
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In the same way as moving objects can change their location over time, the spatial relationships between them can change over time. An important class of spatial relationships are cardinal directions like north and southeast. In spatial databases and GIS, they characterize the relative directional position between static objects in space and are frequently used as selection and join criteria in...
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THERE are some features relative to the size of the retinal images in these two conditions which are of general interest, though they are rarely discussed. Axial Ametropia.-The " basic " (blurred) retinal image is smallest in hyperopia, intermediate in emmetropia, and largest in myopia. The size of a blurred retinal image is best taken from the points in the diffusion circles at the extremities...
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ژورنال
عنوان ژورنال: British Journal of Ophthalmology
سال: 1950
ISSN: 0007-1161
DOI: 10.1136/bjo.34.4.261