Parks-Bielschowsky three-step test
A systematic three-step diagnostic protocol used to identify which extraocular muscle is causing a vertical deviation.
Full Definition
The Parks-Bielschowsky three-step test is a standardized clinical examination sequence designed to isolate and identify paralytic or restrictive extraocular muscle disorders causing vertical strabismus. Step one determines which eye is hypertropic in primary gaze, step two identifies whether the hypertropia increases on right or left gaze, and step three uses the Bielschowsky head tilt test to determine if the deviation changes with head positioning. This systematic approach is essential for accurate diagnosis and surgical planning in pediatric patients with complex strabismus.
Usage
Usage note: Hyphenate when used as a compound modifier; capitalize Parks and Bielschowsky as proper nouns.
In Context
- "The Parks-Bielschowsky three-step test confirmed a right superior oblique palsy in this 8-year-old patient." — Diagnostic report
- "Complete documentation of all three steps is required for insurance preauthorization of strabismus surgery." — Clinical documentation guidelines