Definitive treatment is (typically outpatient, non-emergent) surgery, wherein clouded lens is removed and replaced with clear, artificial lens
Other supportive care modalities that help with visual symptoms include:
Using brighter lights while at work or at home
A trial of anti-glare sunglasses for outdoor activities
Using magnifying lens glasses for reading and other daily
Cataracts
Painful
Red eye 
Arteritic anterior ischemic optic neuropathy
Ocular palsy
Optic neuritis
Papilledema
Temporal arteritis†