If you're new to wearing eye glasses then it can be normal for your eyes to feel tired after wearing the eye glasses.
This is because it takes time for your eyes to adjust to the eye glasses and after a week or so of wearing the eye glasses your eyes should stop feeling tired after your eyes get used to it.
Another reason your eyes can feel tired after wearing eye glasses is because you sometimes blink less often when wearing the glasses which causes dry eyes.
Having dry eyes can make your eyes feel tired as well so you may need to use some eye drops to help keep your eyes moist.
If your eyes continue to feel tired when wearing eyeglasses then you should speak to the eye doctor to find out what is actually going on because the eye glasses may not be correct anymore for your eyes and you may need to get new eye glasses.
Go see an eye doctor and get a new eye exam if your eyes are feeling fatigued or you have eye pain, or headaches.