Full-Field Accommodation in Rhesus Monkeys Measured Using Infrared Photorefraction
نویسندگان
چکیده
منابع مشابه
Applicability of infrared photorefraction for measurement of accommodation in awake-behaving normal and strabismic monkeys.
PURPOSE This study was designed to use infrared photorefraction to measure accommodation in awake-behaving normal and strabismic monkeys and describe properties of photorefraction calibrations in these monkeys. METHODS Ophthalmic trial lenses were used to calibrate the slope of pupil vertical pixel intensity profile measurements that were made with a custom-built infrared photorefractor. Day ...
متن کاملDynamic accommodation in rhesus monkeys
The dynamics of Edinger-Westphal (EW) stimulated accommodation were studied in two young rhesus monkeys to understand the relationships between accommodative amplitude and rates of accommodation and disaccommodation. Accommodative responses were recorded with infrared photorefraction at five different amplitudes spanning the full EW stimulated accommodative range available to each eye. Combined...
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Accommodation, the mechanism by which the eye focuses on near objects, is lost with increasing age in humans and monkeys. This pathophysiology, called presbyopia, is poorly understood. We studied aging-related changes in the dynamics of accommodation in rhesus monkeys aged 4-24 yr after total iridectomy and midbrain implantation of an electrode to permit visualization and stimulation, respectiv...
متن کاملThe role of the iris in accommodation of rhesus monkeys.
After unilateral total iridectomy, maximum accommodation inducible by corneal iontophoresis of carbachol in rhesus monkeys was approximately 40% less in the iridectomized than in the contralateral untouched eyes, irrespective of age. Ultrasonographically measured anterior chamber shallowing and lens thickening were also less in the iridectomized eyes. Neither submaximal accommodation induced by...
متن کاملAn evaluation of the lag of accommodation using photorefraction
OBJECTIVE The lag of accommodation which occurs in most human subjects during reading has been proposed to explain the association between reading and myopia. However, the measured lags are variable among different published studies and current knowledge on its magnitude rests largely on measurements with the Canon R-1 autorefractor. Therefore, we have measured it with another technique, eccent...
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ژورنال
عنوان ژورنال: Investigative Opthalmology & Visual Science
سال: 2012
ISSN: 1552-5783
DOI: 10.1167/iovs.11-8324