Results 51 to 60 of about 85 (74)
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Theory of eccentric photorefraction (photoretinoscopy): astigmatic eyes
Journal of the Optical Society of America A: Optics and Image Science, and Vision, 1991An optical analysis of eccentric photorefraction (photoretinoscopy) of astigmatic eyes is presented. The size and the angular tilt of the dark crescent appearing in the subject's pupil are derived as a function of five variables: the ametropia of the eye (Dsph, Dcyl, axis), the eccentricity of the flash, e, and the distance of the camera from the ...
Anthony Norcia
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Optometry and Vision Science, 1985
ABSTRACT Recent photographic studies have generated mewed interest in the optics of the retinoscopic (skiascopic) image. In photoretinoscopy the subject's eye is illuminated by a point source of light and the fundal image of this light at the plane of the subject's pupil is observed or photographed from a position near the source. The
Howard C Howland
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ABSTRACT Recent photographic studies have generated mewed interest in the optics of the retinoscopic (skiascopic) image. In photoretinoscopy the subject's eye is illuminated by a point source of light and the fundal image of this light at the plane of the subject's pupil is observed or photographed from a position near the source. The
Howard C Howland
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Vision Science and its Applications, 1999
Results from experimental animals have suggested that the retina can determine the amount and the sign of defocus at each location in the visual field to control the growth of the underlying sclera.
Antonio Guirao +2 more
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Results from experimental animals have suggested that the retina can determine the amount and the sign of defocus at each location in the visual field to control the growth of the underlying sclera.
Antonio Guirao +2 more
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Evaluation of Infant Accommodation Using Retinoscopy and Photoretinoscopy
Optometry and Vision Science, 2009ABSTRACT Purpose. To compare PlusOptix PowerRefractor (PR) and Monocular Estimation Method (MEM) for measurement of infant accommodation and to assess the usefulness of applying individual calibration factors to PR data. Methods.
Donald O Mutti
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Three-dimensional reconstruction of surfaces by automated infrared photoretinoscopy
Vision Science and its Applications, 1997A photoretinoscope with infrared light-emitting diodes (LED) operating simultaneously from different eccentricities creates an almost linear change in brightness across the pupillary meridian perpendicular to the knife edge (Schaeffel et al., 1993a).
Frank Schaeffel, Howard C Howland
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Measurement of Astigmatism by Automated Infrared Photoretinoscopy
Optometry and Vision Science, 1997ABSTRACT: Background. There are basically two possibilities to measure cylindrical refractive errors by eccentric photorefraction. The first is to determine the size and the tilt of the light crescent in the subject's pupil. Sphere, cylinder, and axis can be obtained from
Frank Schaeffel +2 more
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Optometry and Vision Science, 1987
ABSTRACT The presence of significant refractive error and/or anisometropia can produce an irreversible decrease in visual function if not detected and treated at an early age. The general consensus is that the earlier a problem is detected, the easier the process of remediation. The authors have examined photoretinoscopy as a means of
R H, Duckman, B, Meyer
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ABSTRACT The presence of significant refractive error and/or anisometropia can produce an irreversible decrease in visual function if not detected and treated at an early age. The general consensus is that the earlier a problem is detected, the easier the process of remediation. The authors have examined photoretinoscopy as a means of
R H, Duckman, B, Meyer
openaire +2 more sources