PSP’s heterogeneity is well documented, with the MDS-PSP criteria delineating subtypes based on dominant features, reflecting variable tau distribution [6].PSP-Richardson’s syndrome (PSP-RS): accounting for 50–60% of cases, PSP-RS presents with early postural instability, falls within the first year, and supranuclear gaze palsy [7]. The gene discussed is MAPT; the disease is X-linked retinoschisis.