Question juridique clé
Whether the insured person's disability pension had to be increased on revision under Article 17 LPGA due to a material change in health or earning capacity.
Solution extraite
No material change was shown between the relevant comparison dates; the half pension remained justified.
Motifs extraits
In a revision, the decisive comparison is between the situation at the last materially assessed decision and the new decision. The expert psychiatrist's later assessment remained consistent with earlier findings, and the newly invoked light intellectual disability did not establish a deterioration affecting work capacity.