See a retina special. There are no treatments for this. In the very small percentage that also get choroidal neovascularization, anti-vegf injections are helpful. This is a disease where gene therapy will theoretically be helpful in the future.
Not to my knowledge. Vitelliform macular dystrophy causes a fatty yellow pigment (lipofuscin) to build up in cells underlying the macula. This causes central vision loss or distortion. Peripheral and night vision usually ok. Considered a genetic disorder. Consult your local opthalmologist for potential treatments being developed.