As one who had a stage 2b Melanoma removed from my left thigh, and two associated lymphatic glands removed from my groin, can I respectfully suggest that you wear more than a visor when working outside in the sun.
Whilst Australia has more melanoma per head than the US, a google search will soon tell you that rates are still high in the US.
So as we say in Australia - "slip, slop, slap" or slip on a hat, slop some sun cream and slap it on.
Take care.
PS a hat that covers your ears.