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Effect of phenylephrine on accommodation.

J A Mordi, W M Lyle, G Y Mousa

American Journal of Optometry and Physiological Optics

|April 1, 1986

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Phenylephrine hydrochloride impacts accommodation, suggesting sympathetic nervous system involvement. Anesthetics prolong phenylephrine

Area of Science:

Ophthalmology
Neuroscience

Background:

The role of the sympathetic nervous system in visual accommodation is debated.
Phenylephrine hydrochloride is a sympathomimetic agent.

Purpose of the Study:

To investigate the effect of phenylephrine hydrochloride on accommodation.
To examine the influence of iris pigmentation and topical anesthetics on this effect.

Main Methods:

Topical instillation of phenylephrine hydrochloride.
Assessment of accommodation and pupil diameter.
Consideration of iris color and prior anesthetic application.

Main Results:

The sympathetic nervous system influences accommodation.
Phenylephrine hydrochloride affects accommodation and pupil diameter.

Related Experiment Videos

Topical anesthetics prolong the effects of phenylephrine, particularly in eyes with varying iris pigmentation.

Conclusions:

Sympathetic nervous system activation plays a role in visual accommodation.
Anesthetic premedication can modulate the duration of phenylephrine-induced effects on accommodation and pupil size.