SPF on 0 UV Index?

[appealisLAW]

is spf pointless when it's UV 0 all day outside? i am on accutane so idk if it's still better to apply since it's not as light as normal moisturizers.

 

[avgsub5human]

is spf pointless when it's UV 0 all day outside? i am on accutane so idk if it's still better to apply since it's not as light as normal moisturizers.

pretty sure its useless im on tret and it has finally started to reach 1-2 now so ill start using it, before I did not