The interaction of pupil response with the vergence system.

Feil, Moritz; Moser, Barbara; Abegg, Mathias (2017). The interaction of pupil response with the vergence system. Graefe's archive for clinical and experimental ophthalmology, 255(11), pp. 2247-2253. Springer 10.1007/s00417-017-3770-2

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PURPOSE A gaze shift from a target at distance to a target at near leads to pupillary constriction. The regulation of this pupillary near response is ill known. We investigated the impact of accommodation, convergence, and proximity on the pupillary diameter. METHODS We recorded pupil size and vergence eye movements with the use of an infrared eye tracker. We determined the pupillary response in four conditions: (1) after a gaze shift from far to near without accommodation, (2) after a gaze shift from far to near with neither accommodation nor convergence, (3) after accommodation alone, and (4) after accommodation with convergence without a gaze shift to near. These responses were compared to the pupil response of a full near response and to a gaze shift from one far target to another. RESULTS We found a reliable pupillary near response. The removal of both accommodation and convergence in gaze shift from far to near abolished the pupillary near response. Accommodation alone did not induce pupillary constriction, while convergence and accommodation together induced a pupil response similar to the full near response. CONCLUSIONS The main trigger for the pupillary response seems to be convergence. Neither accommodation nor proximity alone induce a significant pupillary constriction. This suggests that the miosis of the near triad is closely coupled to the vergence system rather than being independently regulated.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Ophthalmology

UniBE Contributor:

Abegg, Mathias


600 Technology > 610 Medicine & health








Mathias Abegg

Date Deposited:

18 May 2018 09:30

Last Modified:

18 May 2018 09:30

Publisher DOI:


PubMed ID:


Uncontrolled Keywords:

Accommodation Convergence Near triad Pupil




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