Eyes getting red

Hi, my mother went to the doctor to laser her eyes. One eye got better the other one didn't the doctor prescribed here medicine. After several discussions with my mother I told her not the use it anymore cause it burned and made her eye red. But she used it anyway. She also sees bad with that eye. Since I haven't done any research on this subject i was wondering can this be cured and can the sight of seeing beeing cured also?


thanks.