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Of course the space suits can block most part of the radiation, but do the astronauts need to use sunscreen to protect their faces from the radiation passing thought the helmet or passing through the window in the ISS (or any other spacecraft)?

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At least on the Space Shuttle, all the windows except one had coatings to prevent transmission of ultraviolet light. The exception was the side hatch window, which had the coating left off to allow for the possibility of experimental observations using UV.

This excerpt from the shuttle Entry Checklist shows how the crewmember was supposed to put on sunglasses before removing the side hatch window UV filter, and warns that damage can occur in 10 seconds.

enter image description here

The Shuttle (and Station) suits have visors that can be pulled down to block UV light.

References - Generic Entry Checklist

Addendum: Here's a picture of STS-131 pilot Jim Dutton at the side hatch window pointing to the Orbiter boom-mounted inspection camera as it passes by outside. If you view the image at full resolution, you can see that the UV filter is in place. It's surrounded by silver foil tape and held in place by blue Velcro.

enter image description here

You can also see the warning sticker.

enter image description here

Image Source - note that the image description on the page is incorrect, this is not an airlock hatch.

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    $\begingroup$ I have to ask (you can tell me whether or not this should be in another question)... are the number of warning signs due to a previous incident where someone was blinded by UV light? $\endgroup$
    – Magic Octopus Urn
    Commented Sep 30, 2018 at 6:57
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    $\begingroup$ AFAIK no, just being careful. $\endgroup$
    – Organic Marble
    Commented Sep 30, 2018 at 11:16
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    $\begingroup$ @Magic Octopus ,,, The danger from UV is burning, not blinding. UV is absorbed by the cornea and causes a "flash burn" of the surface epithelium. This is a very common injury for arc welders. It is very painful and causes spasmic closure of the eyelids. But the cornea usually heals within a day. Usually there is no damage to vision. $\endgroup$
    – Woody
    Commented Jul 31, 2023 at 2:38
  • $\begingroup$ @Woody unfortunately MagicOctopusUrn, a really great contributor, has been gone for years. $\endgroup$
    – Organic Marble
    Commented Jul 31, 2023 at 11:50

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