منابع مشابه
Dynamic 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...
متن کاملAccommodation dynamics in aging rhesus monkeys.
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 کاملChanges in crystalline lens radii of curvature and lens tilt and decentration during dynamic accommodation in rhesus monkeys.
Dynamic changes in crystalline lens radii of curvature and lens tilt and decentration were measured during centrally stimulated accommodation in four iridectomized eyes of two adolescent rhesus monkeys. Phakometry measurements were performed dynamically using a custom-built, video-based, Purkinje-image instrument. Lens anterior and posterior radii were calculated from reflections of paired ligh...
متن کاملComparisons between pharmacologically and Edinger-Westphal-stimulated accommodation in rhesus monkeys.
PURPOSE Accommodation results in increased lens thickness and lens surface curvatures. Previous studies suggest that lens biometric accommodative changes are different with pharmacological and voluntary accommodation. In this study, refractive and biometric changes during Edinger-Westphal (EW) and pharmacologically stimulated accommodation in rhesus monkeys were compared. METHODS Accommodatio...
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ژورنال
عنوان ژورنال: Vision Research
سال: 2002
ISSN: 0042-6989
DOI: 10.1016/s0042-6989(01)00260-7