Photochromic glasses lenses have the same effect of blocking the UV rays as sunglasses, they can change from light to dark when you outside in seconds, So they may have the same effect as sunglasses, Anyone can tell me which one is more suitable for me?

If you are shortsighted. I think Photochromic glasses may suit you better, you don't need to change to your prescription eyeglasses when you from outdoors to indoors.