Central retina plays a decisive role in the suppression of pupillary escape.

"Declarations Ethics approvalThe study cohort represented a subgroup of a project for establishing a normative database of chromatic pupil campimetry, which has been approved by the local institutional ethics committee of the Medical Faculty, University of Tübingen, and followed the ethical standards according to the Declaration of Helsinki. Consent to participateWritten informed consent was obtained from all individual participants included in the study. Consent for publicationConsent for data publication was given from all participants. Conflict of interestThe authors declare no conflict of interest. Conflict of interest The authors declare no conflict of interest."

"Funding Open Access funding enabled and organized by Projekt DEAL. This study was supported by the Egon Schumacher-Stiftung, Barnstorf, Germany, a private foundation without commercial interest."