The commonest symptom of cataract is a gradual, progressive blurring of vision that cannot be corrected despite wearing spectacles. The vision tends to be worse at night, and there may be glare and haloes around lights. The patient experiences difficulty with both distant vision and near vision and things appear less bright. A continued change in spectacle power may signify the progression of the cataract.

The cataract can be diagnosed when seeing an eye specialist and having an eye examination.