Alkaloids present in plants of the genera Brugmansia and Datura, such as scopolamine, may also induce anisocoria. Migraines

Diagnosis
Causes of anisocoria range from benign (normal) to life-threatening conditions. Clinically, it is important to establish whether anisocoria is more apparent in dim or bright light to clarify if the larger pupil or smaller pupil is the abnormal one. Anisocoria which is worsened (greater asymmetry between the pupils) in the dark suggests the small pupil (which should dilate in dark conditions) is the abnormal pupil and suggests Horners syndrome or mechanical anisocoria. In Horners syndrome sympathetic nerve fibers have a defect, therefore the pupil of the involved eye will not dilate in darkness. If the smaller pupil dilates in response to instillation of apraclonidine eye drops, this suggests Horners syndrome is present. Anisocoria which is greater in bright light suggests the larger pupil (which should constrict in bright conditions) is the abnormal pupil. This may suggest Adie tonic pupil, pharmacologic dilation, oculomotor nerve palsy, or damaged iris.A relative afferent pupillary defect (RAPD) also known as a Marcus Gunn pupil does not cause anisocoria. Some of the causes of anisocoria are 
life-threatening, including Horners syndrome (which may be due to carotid artery dissection) and oculomotor nerve palsy (due to a brain aneurysm, uncal herniation, or head trauma). If the examiner is unsure whether the abnormal pupil is the constricted or dilated one, and if a one-sided drooping of the eyelid is present then the abnormally sized pupil can be presumed to be the one on the side of the ptosis.
While a Mexican study established an overall incidence of 3.4: 1000 live newborns and a carrier detection of 6.8:1000 NBS. References
Further reading
Price, Nicholas C; Stevens, Lewis (1996). Principi di enzimologia [Principles of enzymology] (in Italian). A. Delfino. ISBN 978-88-7287-100-3. OCLC 879866185. Mazzucato, Fernando; Giovagnoni, Andrea (2019). Manuale di tecnica, metodologia e anatomia radiografica tradizionali [Manual of traditional radiographic technique, methodology and anatomy] (in Italian). Piccin. ISBN 978-88-299-2959-7. OCLC 1141547603. Torricelli, P; Antonelli, F; Ferorelli, P; Borromeo, I; Shevchenko, A; Lenzi, S; De Martino, A (March 2020). "Oral nutritional supplement prevents weight loss and reduces side effects in patients in advanced lung cancer chemotherapy". Amino Acids. 52 (3): 445–451. doi:10.1007/s00726-020-02822-7. PMID 32034492. S2CID 211053578. External links

Portal of Chemistry (Italian)