Does the Badal optometer stimulate accommodation accurately?
نویسندگان
چکیده
منابع مشابه
Does the Badal optometer stimulate accommodation accurately?
PURPOSE To study whether the accommodation response to Badal optometer is equivalent to the response for real space targets. METHODS Accommodative responses were measured for 28 young eyes with the WAM-5500 autorefractometer in eight configurations for 0.17 D, 2.0 D and 5.0 D accommodation stimuli. Parameters that might contribute to differences in response were systematically isolated: stimu...
متن کاملAccommodation with and without short-wavelength-sensitive cones and chromatic aberration
Accommodation was monitored while observers (23) viewed a square-wave grating (2.2 cycles/deg; 0.53 contrast) in a Badal optometer. The grating moved sinusoidally (0.2 Hz) to provide a stimulus between -1.00 D and -3.00 D during trials lasting 40.96 s. There were three illumination conditions: 1. Monochromatic 550 nm light to stimulate long-wavelength-sensitive cones (L-cones) and medium-wavele...
متن کاملAn infrared eccentric photo-optometer
An objective infrared optometer has been designed, based on the optical principles of eccentric photorefraction. A CCD camera with an eccentric infrared light source images the subject's pupil through a Badal optometer. The slope of the light distribution across the pupil is continuously recorded. Accommodative state is measured by moving the camera behind the Badal lens until the slope is zero...
متن کاملObjective Amplitude of Accommodation Computed from Optical Quality Metrics Applied to Wavefront Outcomes
PURPOSE: We studied the accuracy and precision of 32 objective wavefront methods for finding the amplitude of accommodation obtained in 180 eyes. METHODS: Ocular accommodation was stimulated with 0.5 D steps in target vergence spanning the full range of accommodation for each subject. Subjective monocular amplitude of accommodation was measured using two clinical methods, using negative lenses ...
متن کاملCross-coupling between accommodation and convergence is optimized for a broad range of directions and distances of gaze
Accommodation and convergence systems are cross-coupled so that stimulation of one system produces responses by both systems. Ideally, the cross-coupled responses of accommodation and convergence match their respective stimuli. When expressed in diopters and meter angles, respectively, stimuli for accommodation and convergence are equal in the mid-sagittal plane when viewed with symmetrical con...
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ژورنال
عنوان ژورنال: Ophthalmic and Physiological Optics
سال: 2016
ISSN: 0275-5408
DOI: 10.1111/opo.12334