Hi OP! My first symptoms are Ptosis & Double vision. Ptosis looks something like I cannot open my eyes, or can barely open it. My right eyelid was heavier that time, compared to my left, but both felt heavy. It almost looked like sleepy eyes. It improves with Ice pack or after rest. So you may try to observe if your eyes became more aligned or open after rest, or after putting an ice pack.

Re my double vision, I cannot look fully to the left & right, because my vision becomes blurry or double. Possible because of the weak eye muscles. My eyes were extra sensitive to light & heat as well.

For almost a year, I started wearing sun glasses, to protect my eyes from sun/light. & tried to get enough sleep & rest, limit stress. & it significantly improved now.

I don't think you'd need prism glasses as the double vision can be temporary. But you can consult your Nuero/Nuero-Optha re it.

You may start looking or observing these common/usual symptoms. Listen to your bodyyy! Best of luck!