Results 71 to 80 of about 103 (87)

Measurement of Astigmatism by Automated Infrared Photoretinoscopy

Optometry and Vision Science, 1997
ABSTRACT: 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
F Gekeler, Frank Schaeffel, Howard C Howland   +2 more
exaly   +3 more sources

Three-dimensional reconstruction of surfaces by automated infrared photoretinoscopy

Vision Science and its Applications, 1997
A 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
exaly   +2 more sources

Evaluation of Infant Accommodation Using Retinoscopy and Photoretinoscopy

Optometry and Vision Science, 2009
ABSTRACT 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
exaly   +3 more sources

Use of Photoretinoscopy as a Screening Technique in the Assessment of Anisometropia and Significant Refractive Error in Infants/Toddlers/Children and Special Populations

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
openaire   +2 more sources

VIDEO PHOTORETINOSCOPY OF THE EYES OF THE SMALL ODONTOCETES TURSIOPS TRUNCATUS, PHOCOENA PHOCOENA, AND KOGIA BREVICEPS

Marine Mammal Science, 1998
Thomas W. Cronin, Jeffry I. Fasick, Howard C. Howland   +2 more
openaire   +1 more source

VIDEO PHOTORETINOSCOPY OF THE EYES OF THE SMALL ODONTOCETES TURSIOPS TRUNCATUS, PHOCOENA PHOCOENA, AND KOGIA BREVICEPS

Marine Mammal Science, 1998
Thomas W Cronin, Jeffry I Fasick, Howard C Howland   +2 more
exaly  

Automatic Infrared Refractors—A Comparative Study

Optometry and Vision Science, 1987
Wolfgang Wesemann
exaly  

Natural accommodation in the growing chicken

Vision Research, 1986
Frank Schaeffel, Howard C Howland
exaly  

Variations in the off-axis refractive state in the eye of the Vietnamese leaf turtle ( Geoemyda spengleri )

Journal of Comparative Physiology A: Neuroethology, Sensory, Neural, and Behavioral Physiology, 2003
Miriam J Henze, Frank Schaeffel
exaly  

NO EVIDENCE OF ACCOMMODATION IN THE EYES OF THE BOTTLENOSE DOLPHIN, TURSIOPS TRUNCATUS

Marine Mammal Science, 2001
Thomas W Cronin
exaly