According to the
modding syntax, eyes are not a bodypart that can be covered under the parameter
[ARMOUR_COVERAGE:]. Therefore, it is currently impossible to create an armor piece capable of protecting the eyes.
For maximum coverage of the other head parts, you can layer:
- fur hood and iron spectacle helm to protect face and skull
- mail cowl and woollen veil to protect skull and neck
The total weight of this gear is around 8 lbs.
I consider the long mail cowl to be unnecessary for most purposes. While yes, it provides additional coverage to the shoulders* compared to the standard mail cowl, but the drawback is that it's also 2 lbs heavier.
This can make a difference when you're layering other clothes, since worn equipment begins to contribute to the encumbrance penalty when the total weight goes over 10% of your character's bodyweight.
*Most armor and clothing tops for the torso will also extend to or past the shoulders (excluding the cuirass, which provides only thorax plus abdomen protection).