منابع مشابه
Dynamic accommodation and myopia.
PURPOSE Accommodative effort during nearwork is thought to be a causative factor in the development of myopia. It has been proposed that an anomaly in autonomic control may be a precursor to the development of myopia. In the present study the closed-loop accommodation response after variations in fixation period was investigated in emmetropes, early-onset myopes and late-onset myopes to determi...
متن کاملSpherical Aberration, Accommodation and Myopia
Myopia should not be considered a benign condition because of the potential risks of vision loss associated not only with high myopia but also with the procedures used to correct myopia. Results from animal studies demonstrating that emmetropization is an active rather than a passive process and the induction of myopic refractive errors with imposed hyperopic defocus underlie the hypothesis tha...
متن کاملInfluence of thymoxamine on changes in pupil diameter and accommodation produced by homatropine and ephedrine.
Local instillation of thymoxamine eye drops (0-1%) completely reversed the mydriasis produced by ephedrine (5%) but not that produced by ephedrine (5%) together with homatropine (0-5%). Small but significant changes in accomodation were found with ephedrine and with thymoxamine, as well as the larger expected changes with homatropine.
متن کاملThe effects of phenylephrine on pupil diameter and accommodation in rhesus monkeys.
PURPOSE Phenylephrine is used to dilate the iris through alpha-adrenergic stimulation of the iris dilator muscle. Sympathetic stimulation of the ciliary muscle is believed to be inhibitory, decreasing accommodative amplitude. Investigations in humans have suggested some loss of functional accommodation after phenylephrine. It is unclear whether this loss is due to direct action of phenylephrine...
متن کاملEmotional imagery and pupil diameter.
Pupil diameter is enhanced in a variety of emotional contexts, including viewing pictures, listening to sounds, and during threat of shock. In this study, we investigated pupil diameter changes during emotional imagery. Participants imagined scenes describing pleasant, unpleasant, or neutral events while pupil diameter was continuously recorded. Second by second changes in pupil diameter were a...
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ژورنال
عنوان ژورنال: Ophthalmic and Physiological Optics
سال: 2009
ISSN: 0275-5408,1475-1313
DOI: 10.1111/j.1475-1313.2008.00611.x