If you reach the age of 48, for normal eyes should reach the age when you start to have presbyopia. If you see very clearly at a distance, but just look more and more unclear near, it is likely that you have started to have presbyopia, you can go to a hospital or optician for an optometry to see if you can see very clearly with presbyopia glasses. If this is the case, you need to wear a pair of presbyopic glasses that are suitable for you. If you still can’t see well with presbyopic glasses, it is recommended that you go to the hospital for an examination because many kinds of eye diseases can cause vision loss, not only for seeing far and near. Some people in their 40s may have started to have senile cataracts, and they will experience painless and gradual vision loss, and they will not be able to see clearly at distance or near. If the vision loss is sudden, it is important to see if there are other eye diseases that affect vision such as fundus bleeding, glaucoma or neuropathy. Therefore, if you find that you can’t see clearly, you should go to the hospital to have your doctor determine if it is just presbyopia caused by degeneration or if there are other eye diseases.