People who are near-sighted or “myopic” still have just as much light enter their eyes. The issue is that their eyes don’t focus the light in the right place. Since the light isn’t focused correctly, the image is blurry which you may have a sense for if you’ve ever used an out of focus microscope or binoculars.

Stars are so far away that we don’t see any detail in them anyways. For the most part, stars look like pinpricks of light. In this case, eyes being out of focus doesn’t matter too much because there’s no complex details to focus. However, the stars may be a little fuzzier and therefore seem bigger to someone that’s near-sighted. Also, some of the less bright stars may not be seen by someone that is near-sighted. Of course, there are many stars that you can’t see in an area with a lot of light pollution or without a telescope.