Are There Night Driving Restrictions for Patients with Incomplete Congenital Stationary Night Blindness?

Background

Congenital stationary night blindness refers to a heterogeneous group of rare, inherited retinal disorders characterized by congenital, non-progressive visual impairment [1], [2]. Among the different subtypes of CSNB, the incomplete form is associated with an altered signal transmission from the photoreceptors to both ON- and OFF-bipolar cells, impairing visual processing [3]. Clinically, patients with incomplete CSNB present with nyctalopia, reduced visual acuity, and photophobia [4]. These symptoms can significantly affect daily functioning, particularly tasks that require adequate vision under low-light conditions.

In Switzerland, the Traffic Licensing Ordinance (TLO) defines medical criteria for assessing driving fitness [5], [6]. These include specific thresholds for visual acuity, visual field, and functional vision under mesopic conditions, with optional assessments of contrast sensitivity and glare sensitivity when relevant. Individuals with significant impairments in these domains may face restrictions, particularly regarding nighttime driving. Given the visual limitations associated with incomplete CSNB, it is essential to assess whether affected individuals should be restricted from driving at night to ensure both personal and public safety.

Publication History

Received: 24 September 2025

Accepted: 18 December 2025

Article published online:
17 February 2026

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