Question juridique clé
Whether the insured person's condition had materially worsened so as to justify revision of the disability pension.
Solution extraite
Yes. The medical evidence showed a substantial deterioration in pulmonary function compared with the original pension award.
Motifs extraits
The Federal Court accepted the cantonal court's reliance on the court-appointed expert report. The IV office failed to show any obvious error in the factual findings or any breach of the free assessment of evidence.