Yes, that can be a serious symptom that can be due to a cataract or even a tumor within the eye. See an Eye MD as soon as possible.
JCH MD
Been to eye MD, they say there's no tumour in the eye, just keratoconus causing white reflex. Glasses for weakened vision and return appointment in 4 months.
Okay, that's a whole lot better than a tumor. Good luck.
JCH MD