you jumped your rat a bit quick... i would've only bumped him to 60 to ease into it... if they vision is tolerable then just keep him at 70 for at least the next 2 weeks... then assess him from there and let me know and we'll move his dosage accordingly... i think he will be just fine... s4 is just such a delicate dosing... its good the vision is tolerable though... that's a good sign bro...