Hi. My Daughter Is 22, She's Been Diagnosed With Cone

Hi. My daughter is 22, she's been diagnosed with cone dystrophy & Stargardt's disease. She has difficulties seeing in the daytime as well as night, images often seem blurry. Kindly advise if there's any treatment for this. Else what are the low vision aids or diet that can help control or improve her vision.
Tq