It was a tongue-in-cheek reference to the radioactive Takumar normals (affecting my vision). However . . . .
I do have an advanced case of glaucoma. I've had several surgeries to install after-market parts in both eyes (non-OEM) so the progress of the disease is controlled, but not reversible.
I've also had both lenses replaced due to cataracts. As a result, whereas for fifteen years I've had to shoot left-eye with a +2.0 SMC Corrective Lens Adapter (K or M, depending) attached to the viewfinder frame to achieve focus, I can now use the K-3 viewfinder with about +0.5 diopter correction (which corrects for the 'normal' -0.5 VF diopter correction)
right eye. What a relief to no longer poke my eye with the film advance lever when metering a KX !!
I just 'adjust' for focus challenges with film cameras.