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METHODS: Using a validated questionnaire, we screened eye symptoms (burning sensation, grittiness, dry eye) in 333 first-degree relatives of 140 probands with different forms of primary adult-onset dystonia, 208 healthy subjects, and 293 patients with primary blepharospasm. RESULTS: The rate of eye symptoms was similar in the relatives of focal dystonia patients and in healthy subjects (adjusted HR, 1.1; 95\% CI, 0.7-1.7; P = .69), thus suggesting a common origin of eye symptoms in both groups. A higher rate was observed in blepharospasm patients (adjusted HR, 2; 95\% CI, 1.4-2.9; P