HSP can not be found with a simple blood test. There is no test definitive to HSP. Doctors may give that diagnosis simply because there is progressive spasticity in the leg muscles, irregardless of the hereditary factor or family history. But sometimes they're right because HSP can occur as a mutant gene in someone with no family history. They become the first generation.

All that about the vision, the aura, the pulsating, that is not part of HSP. The spasticity in the legs and the footdrop -that's due to spasticity- are the only things that fit the HSP scenerio.

From a third generation, at least, HSPer.