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Mydriasis is frequently induced by drugs for certain ophthalmic examinations and procedures, particularly those requiring visual access to the retina. Fixed, unilateral mydriasis could be a symptom of raised intracranial pressure. The opposite, constriction of the pupil, is referred to as miosis. Both mydriasis and miosis can be physiological.
A constriction response , [2] is the narrowing of the pupil, which may be caused by scleral buckles or drugs such as opiates/opioids or anti-hypertension medications. Constriction of the pupil occurs when the circular muscle , controlled by the parasympathetic nervous system (PSNS), contracts, and also to an extent when the radial muscle relaxes.
The name Belladonna, meaning beautiful ladies, was derived from women using berry juice from the plant cosmetically to dilate their pupils. [ 4 ] The mydriatic effect was studied by the German chemist Friedlieb Ferdinand Runge (1795-1867), in which the active ingredient, atropine , was first discovered by Vaquelin in 1809 and was first isolated ...
Anticholinergic drugs are used to treat a variety of conditions: Dizziness (including vertigo and motion sickness-related symptoms) Extrapyramidal symptoms, a potential side-effect of antipsychotic medications; Gastrointestinal disorders (e.g., peptic ulcers, diarrhea, pyloro spasm, diverticulitis, ulcerative colitis, nausea, and vomiting)
Osteoporosis, including drug- and cancer-related osteoporosis, giant cell tumour of bone and hypercalcaemia of malignancies: Hypercholesterolaemia, cataract, urinary retention, hypocalcaemia, osteonecrosis of the jaw and anaphylaxis. Gemtuzumab ozogamicin: IV: CD33 antibody that induces apoptosis of the tagged cell. Acute myeloid leukaemia
(vasoconstriction and mydriasis; used as vasopressors, nasal decongestants and during eye exams). Selected examples are: Adrenoswitch-1 (photoswitchable partial α 1 agonist and light-controlled mydriatic) [1] Methoxamine; Midodrine; Metaraminol; Phenylephrine [2] Amidephrine [3] Sdz-nvi-085 [104195-17-7].
Visceromotor nerve axons (which constitute a portion of cranial nerve III, along with the somatomotor portion derived from the Edinger-Westphal nucleus) synapse on ciliary ganglion neurons, whose parasympathetic axons innervate the iris sphincter muscle, producing miosis.
Tropicamide is occasionally administered in combination with p-hydroxyamphetamine (brand name Paremyd), which is a sympathomimetic. The use of the sympathomimetic drug causes the iris dilator muscle to be directly stimulated, causing increased dilation.