منابع مشابه
An 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 کاملDoes 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 کاملSpatio-temporal vernier acuity.
The study of space-time vernier (STV) provides information on the spatio-temporal structure of the visual system in the same way that the classical spatio-spatial vernier (SSV) provides information on its spatial structure. The transposition of a SSV task into a STV one yields the following experimental format: an object (in the present case a Gaussian Blob) drifts with a constant velocity, V, ...
متن کاملAnisotropies in peripheral vernier acuity.
Vernier acuity for short horizontal, vertical and oblique target lines was measured in many locations in the periphery of the visual field in normal human observers. In the 10 deg periphery, the average alignment threshold with oblique vernier lines in eight locations for three observers was 2.29 times higher than that with vertical and horizontal target lines. This oblique effect was found eve...
متن کاملVernier acuity, crowding and amblyopia.
When a vernier target is flanked by a pair of optimally positioned flanks, offset discrimination is strongly degraded. Spatial interference with vernier acuity was studied in each eye of observers with unilateral amblyopia associated with strabismus, anisometropia or both, and were compared to the functions obtained in the normal periphery (Levi et al., 1985). The results showed that: (1) For b...
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ژورنال
عنوان ژورنال: Behavior Research Methods & Instrumentation
سال: 1980
ISSN: 1554-351X,1554-3528
DOI: 10.3758/bf03201668